All tools
6701 free tools — everything runs in your browser, nothing is uploaded.
Calculators & Converters
Business & Marketing
Bow Arrow Kinetic Energy & FOC Calculator
Calculate arrow kinetic energy, momentum, and front-of-center balance.
D&D Ability Score Optimizer
Arrange D&D standard array or rolled stats for any class
D&D Carrying Capacity Calculator
Know exactly how much your D&D character can carry
Electrical Panel Load Audit Tool
Flag overloaded circuits, undersized conductors, and missing AFCI/GFCI per NEC 2023
FM Synthesis Carrier:Modulator Ratio Calculator
Find harmonic and inharmonic C:M ratios for FM synthesis timbres
Grounding Electrode System Resistance Calculator
Estimate ground-rod resistance with the Dwight formula for single and parallel rods.
Italy INPS Contribution Calculator
Estimate INPS for employees and gestione separata freelancers
LDR Voltage Divider Calculator for DIY Electronics
Calculate the series resistor value for a light-dependent resistor voltage divider
Solar Array Tilt & Azimuth Output Calculator
Estimate how tilt angle and compass orientation change a PV array's annual energy yield.
Water Hammer Arrestor Sizing Calculator
Select a water hammer arrestor size (A–F) per PDI-WH 201 by fixture load
Aldosterone-to-Renin Ratio (ARR) Calculator
Screen for primary aldosteronism from aldosterone and renin
Bone Marrow Blast Percentage Calculator
Calculate blast % from a differential count for AML/MDS diagnosis
Electrical Apprentice NEC Code Study Calculator
Practice NEC load problems with step-by-step solutions and a running score.
Electrical Conduit Bending Calculator
Stub-up, 90, offset, saddle, and back-to-back bend marks for EMT and rigid
Electricity Cost Calculator
Calculate daily, monthly and annual electricity cost for any load from wattage and utility rate.
Electrical Demand Charge Calculator
Estimate monthly demand charges from peak kW and find peak-shaving savings
Fuse vs. Circuit Breaker Comparison Tool
Compare clearing times of current-limiting fuses and breakers at any fault multiple.
Grounding & Bonding Checklist Generator (NEC 250)
Generate a site-specific NEC Article 250 grounding and bonding checklist
Electric Heat Trace Sizing Calculator
Size pipe heat trace cable wattage per foot for freeze protection at design ambient
Electrical Permit Load Summary Generator
Generate a permit-ready load summary sheet for AHJ submission from circuit data.
Electrical Safety Clearance Distance Calculator
Look up NFPA 70E shock approach boundaries for qualified and unqualified workers
Electrical Wire Cost Estimator
Estimate material cost for a wire pull from AWG, insulation type, footage, and price
Electricity Grid Carbon Intensity Tool
Look up CO2 per kWh for 40+ national electricity grids
Electrophoresis DNA Ladder Band Size Estimator
Estimate band sizes from gel image using ladder migration distances
IPG Strip pH Range Selector for 2D-PAGE
Match protein pI to the correct IEF strip pH range for 2D electrophoresis
Material Removal Rate (MRR) Calculator
Calculate cubic inches per minute removed in milling or turning
Peptide Molecular Weight & Isoelectric Point Calculator
Compute MW and pI from a one-letter amino acid sequence
Nutritional Requirements Calculator (Harris-Benedict / Mifflin)
Total daily energy and protein needs for clinical nutrition
Runway Length Required Calculator
Estimate factored takeoff and landing field lengths from performance inputs
Solar Array Shading Loss Estimator
Estimate annual PV energy loss from a tree, ridge, or chimney by sun-path geometry
Spectrophotometry Absorbance to Concentration Calculator
Apply Beer-Lambert for single readings or a standard curve
Stick Electrode Selection Guide
Match SMAW electrode type to base metal, joint position, and penetration need
Meat Roasting Time Calculator
Roasting times and safe internal temperatures by weight and doneness.
Electricity Bill Estimator
Turn watts and hours into a daily, monthly and yearly cost.
Electricity Cost Calculator
Add every appliance, set your tariff, and see daily, monthly and yearly running costs.
Contribution Margin Calculator
Instantly find your CM per unit, CM ratio, break-even point and operating leverage.
Current Ratio Calculator
Instant liquidity analysis: current ratio, quick ratio, cash ratio and net working capital.
EBITDA Calculator
Calculate EBITDA, margins, EV/EBITDA, and key leverage ratios instantly.
Economic Order Quantity (EOQ) Calculator
Find the optimal order size that minimises total inventory cost.
Payback Period Calculator
Find how long until your investment breaks even — simple and discounted methods.
Quick Ratio Calculator (Acid-Test)
Instantly measure short-term liquidity — does your business have enough liquid assets to cover current debts?
Return on Assets (ROA) Calculator
Measure how efficiently a business turns its asset base into profit.
Return on Equity Calculator
Calculate ROE — basic, DuPont 3-factor and DuPont 5-factor decomposition.
Working Capital Calculator
Measure liquidity: current ratio, quick ratio, cash conversion cycle and more.
Debt-to-Equity Ratio Calculator
Compute D/E ratio, net leverage, debt ratio and interest coverage from a balance sheet.
Electric Field Calculator
Solve E = k·Q/r², V = k·Q/r, F = qE and Gauss's Law with full working shown.
Photoelectric Effect Calculator
Calculate KE, stopping voltage, threshold frequency and wavelength using Einstein's equation KE = hf − φ.
Burn Rate & Runway Calculator
Know exactly how long your cash will last — and what to do about it.
Customer Acquisition Cost (CAC) Calculator
Calculate blended CAC, LTV:CAC ratio and payback period by channel.
MRR Calculator
Calculate Monthly Recurring Revenue, ARR, LTV and forward projections.
A/B Test Significance Calculator
Know whether your experiment result is real — two-proportion z-test with p-value, confidence interval and power check.
ARR Calculator
Calculate Annual Recurring Revenue, NRR, GRR and MRR bridge in seconds.
Average Order Value Calculator
Calculate AOV, compare periods and find the AOV needed to hit a revenue target.
CAC Payback Period Calculator
Find out how many months it takes to recover your customer acquisition cost.
Churn Rate Calculator
Calculate customer churn, MRR churn, LTV, and cohort retention — all in your browser.
Click-Through Rate (CTR) Calculator
Instantly calculate CTR, CPC, CPM, conversion rate and ROAS from your campaign data.
Conversion Rate Calculator
Calculate CVR, ROAS, CPA and test A/B significance in one place.
Cost Per Acquisition (CPA) Calculator
Calculate CPA, LTV, ROAS, CTR, payback period and campaign ROI in one place.
CPC Calculator — Cost Per Click, CTR, ROAS & CPA
Work out your CPC, CTR, CPM, CPA, ROAS and campaign profit in one place.
CPM Calculator
Calculate CPM, total ad spend, or impressions — plus CTR, CPC, CPL and ROAS.
Customer Lifetime Value Calculator
Calculate LTV, LTV:CAC ratio and CAC payback period instantly.
Customer Retention Rate Calculator
Calculate CRR, churn rate, and LTV from your customer counts — single period, trend, or industry benchmark.
Email Open Rate Calculator
Calculate open rate, CTR, CTOR, bounce rate and A/B significance for any email campaign.
Engagement Rate Calculator
Calculate ER by reach, followers, impressions or views — with platform benchmarks.
Gross Merchandise Value (GMV) Calculator
Calculate total marketplace transaction volume, take-rate revenue and net revenue across periods.
LTV to CAC Ratio Calculator
Measure unit economics — how much a customer is worth vs. what it costs to acquire them.
Net Promoter Score (NPS) Calculator
Calculate your NPS instantly from group counts or raw 0–10 survey responses.
ROAS Calculator
Calculate Return on Ad Spend — instantly see ROAS, break-even, POAS and net profit.
Startup Runway Calculator
See exactly how many months of cash you have left — and when revenue covers burn.
Bounce Rate Calculator
Calculate your bounce rate, engagement rate and improvement projection — instantly.
Monthly Active Users (MAU) Calculator
Track MAU growth, churn, stickiness and 30-day retention across multiple periods.
Viral Coefficient Calculator
Calculate K-factor and model exponential growth wave by wave.
Tax & Wages
VAT & Sales Tax Calculator
Add or remove VAT, GST or sales tax for any country.
Take-Home Pay & Salary Tax Calculator
Net salary after income tax and social contributions — UK, US, Germany.
Georgia (GEL) Salary & Take-Home Pay Calculator
Net salary after Georgia's flat 20% income tax and 2% pension.
Bangladesh Income Tax Calculator (FY 2024-25, NBR)
আয়কর হিসাব করুন — calculate your Bangladesh income tax instantly.
Saudi Arabia & UAE VAT Calculator (GCC) — Arabic RTL Friendly
Add or extract VAT for Saudi Arabia, UAE, Bahrain and Oman — with Arabic RTL layout.
Saudi Expat Income Calculator
Saudi take-home: no income tax, GOSI social-insurance deductions
Florida Payroll Take-Home Calculator
Calculate Florida net pay with zero state income tax
Texas Payroll Take-Home Calculator
Calculate Texas net pay — no state income tax, just federal plus FICA.
Washington State Payroll Calculator
Calculate WA net pay including PFML and LTI premiums
China VAT Calculator — 13% / 9% / 6%
Calculate Chinese VAT (增值税) at 13%, 9% or 6% by industry, both ways.
Ethiopia VAT Calculator
Add or extract Ethiopia's 15% VAT — flags zero-rated and exempt items.
Excavation Cut & Fill Volume Calculator
Estimate cut and fill earthwork volumes for grading or foundation work
Norway MVA (VAT) Calculator — 25% / 15% / 12%
Calculate Norwegian MVA at the 25%, 15% or 12% rate in both directions.
Saudi Arabia VAT Calculator (15%)
Add or extract Saudi 15% VAT in both directions with a full breakdown.
Thailand VAT Calculator
Add or extract Thailand's 7% VAT — instant result in your browser.
TIG Tungsten Size & Prep Calculator
Select the right tungsten diameter, alloy, and tip prep for any TIG weld
UAE VAT Inclusive/Exclusive Calculator (5%)
Add or extract the UAE 5% VAT component in both directions instantly.
Alaska Payroll Calculator
Calculate Alaska net pay — no state income or sales tax
Nevada Payroll Calculator
Calculate Nevada net pay — no state income tax, MBT applies to employers
New Hampshire Payroll Calculator
Calculate NH net pay — wages untaxed, investment income tax abolished 2025
South Dakota Payroll Calculator
Calculate South Dakota net pay with no state income tax
Tennessee Payroll Calculator
Calculate Tennessee net pay — no state income tax on wages
Wyoming Payroll Calculator
Calculate Wyoming net pay — no state income tax or estate tax
Albuquerque Minimum Wage & Overtime Calculator
Calculate Albuquerque hourly and weekly pay at the local $12.00/hr minimum
Atlanta Minimum Wage & Overtime Calculator
Calculate Atlanta hourly and weekly pay at the local $7.25/hr minimum.
Austin Minimum Wage & Overtime Calculator
Calculate Austin hourly and weekly pay at the local $7.25/hr minimum.
Baltimore Minimum Wage & Overtime Calculator
Calculate Baltimore hourly and weekly pay at the local $15.00/hr minimum.
Boston Minimum Wage & Overtime Calculator
Calculate Boston pay at the $15.00/hr Massachusetts minimum wage
Chicago Minimum Wage & Overtime Calculator
Calculate Chicago hourly and weekly pay at the local minimum with overtime
Denver Minimum Wage & Overtime Calculator
Calculate Denver pay at the local $18.29/hr minimum with 1.5x overtime
Detroit Minimum Wage & Overtime Calculator
Calculate Detroit hourly and weekly pay at the local $10.10/hr minimum
Houston Minimum Wage & Overtime Calculator
Calculate Houston pay at the $7.25/hr minimum with 1.5x overtime.
Las Vegas Minimum Wage & Overtime Calculator
Calculate Las Vegas hourly and weekly pay at the local $12.00/hr minimum
Los Angeles Minimum Wage & Overtime Calculator — $17.28/hr
Calculate Los Angeles hourly and weekly pay at the local $17.28/hr minimum.
Louisville Minimum Wage & Overtime Calculator
Calculate Louisville hourly and weekly pay at the local $7.25/hr minimum.
Miami Minimum Wage & Overtime Calculator
Calculate Miami hourly and weekly pay at the local $13.00/hr minimum.
Minneapolis Minimum Wage & Overtime Calculator
Calculate Minneapolis hourly and weekly pay at the local $15.57/hr minimum.
Nashville Minimum Wage & Overtime Calculator
Calculate Nashville hourly and weekly pay at the $7.25/hr minimum.
New York City Minimum Wage & Overtime Calculator
Calculate New York City pay at the local $16.00/hr minimum wage.
Philadelphia Minimum Wage & Overtime Calculator
Calculate Philadelphia hourly and weekly pay at the local $7.25/hr minimum.
Phoenix Minimum Wage & Overtime Calculator
Calculate Phoenix hourly and weekly pay at the local $14.35/hr minimum
Portland Minimum Wage & Overtime Calculator
Compute Portland pay at the metro $15.45 minimum with 1.5x overtime
San Antonio Minimum Wage & Overtime Calculator
Calculate San Antonio hourly and weekly pay at the local $7.25/hr minimum.
San Diego Minimum Wage & Overtime Calculator
Calculate San Diego pay at the $17.25/hr minimum with CA overtime
San Francisco Minimum Wage & Overtime Calculator
Calculate San Francisco pay at the local $18.67/hr minimum with overtime
San Jose Minimum Wage & Overtime Calculator
Calculate San Jose pay at the $17.55/hr local minimum wage
Seattle Minimum Wage & Overtime Calculator
Calculate Seattle hourly and weekly pay at the local $19.97/hr minimum.
Tucson Minimum Wage & Overtime Calculator
Calculate Tucson hourly and weekly pay at the local minimum wage.
Austria USt Calculator (Umsatzsteuer) 2025
Add or extract Austria Umsatzsteuer at 20% — instant result in your browser.
Canada GST Calculator (Goods and Services Tax) 2025
Add or extract Canada Goods and Services Tax at 5% — instant result in your browser.
Czech Republic DPH Calculator (Daň z přidané hodnoty) 2025
Add or extract Czech Republic Daň z přidané hodnoty at 21% — instant result in your browser.
Denmark Merværdiafgift Calculator (Moms) 2025
Add or extract Denmark Moms at 25% — instant result in your browser.
Egypt VAT Calculator (Value Added Tax) 2025
Add or extract Egypt Value Added Tax at 14% — instant result in your browser.
Finland ALV Calculator (Arvonlisävero) 2025
Add or extract Finland Arvonlisävero at 25.5% — instant result in your browser.
Ghana VAT Calculator (Value Added Tax) 2025
Add or extract Ghana Value Added Tax at 15% — instant result in your browser.
Greece ΦΠΑ / FPA Calculator (Φόρος Προστιθέμενης Αξίας) 2025
Add or extract Greece Φόρος Προστιθέμενης Αξίας at 24% — instant result in your browser.
Hungary ÁFA Calculator (Általános Forgalmi Adó) 2025
Add or extract Hungary Általános Forgalmi Adó at 27% — instant result in your browser.
Portugal IVA Calculator (Imposto sobre o Valor Acrescentado) 2025
Add or extract Portugal Imposto sobre o Valor Acrescentado at 23% — instant result in your browser.
Romania TVA Calculator (Taxa pe Valoarea Adăugată) 2025
Add or extract Romania Taxa pe Valoarea Adăugată at 19% — instant result in your browser.
Turkey KDV Calculator (Katma Değer Vergisi) 2025
Add or extract Turkey Katma Değer Vergisi at 20% — instant result in your browser.
Bolivia Income Tax Calculator 2025 — 13% Flat Rate
Calculate your Bolivia take-home pay under the 13% flat income tax — monthly or annual, instant result in your browser.
Bosnia and Herzegovina Income Tax Calculator 2025 — 10% Flat Rate
Calculate your Bosnia and Herzegovina take-home pay under the 10% flat income tax — monthly or annual, instant result in your browser.
Bulgaria Income Tax Calculator 2025 — 10% Flat Rate
Calculate your Bulgaria take-home pay under the 10% flat income tax — monthly or annual, instant result in your browser.
Estonia Income Tax Calculator 2025 — 20% Flat Rate
Calculate your Estonia take-home pay under the 20% flat income tax — monthly or annual, instant result in your browser.
Hungary Income Tax Calculator 2025 — 15% Flat Rate
Calculate your Hungary take-home pay under the 15% flat income tax — monthly or annual, instant result in your browser.
Kazakhstan Income Tax Calculator 2025 — 10% Flat Rate
Calculate your Kazakhstan take-home pay under the 10% flat income tax — monthly or annual, instant result in your browser.
Mongolia Income Tax Calculator 2025 — 10% Flat Rate
Calculate your Mongolia take-home pay under the 10% flat income tax — monthly or annual, instant result in your browser.
North Macedonia Income Tax Calculator 2025 — 10% Flat Rate
Calculate your North Macedonia take-home pay under the 10% flat income tax — monthly or annual, instant result in your browser.
Romania Income Tax Calculator 2025 — 10% Flat Rate
Calculate your Romania take-home pay under the 10% flat income tax — monthly or annual, instant result in your browser.
Russia Income Tax Calculator 2025 — 13% Flat Rate
Calculate your Russia take-home pay under the 13% flat income tax — monthly or annual, instant result in your browser.
Turkmenistan Income Tax Calculator 2025 — 10% Flat Rate
Calculate your Turkmenistan take-home pay under the 10% flat income tax — monthly or annual, instant result in your browser.
Vikram Samvat Converter
Convert between Gregorian (CE) and Vikram Samvat (VS) years.
GST Inclusive / Exclusive Calculator
Add or remove GST at any rate — see net, GST and gross.
Reverse Sales Tax Calculator
Strip VAT, GST or sales tax out of a tax-inclusive price.
Paycheck Budget Split
Split your pay into needs, wants and savings.
Paycheck Splitter
Split every paycheck across needs, wants and savings — 50/30/20 or your own rules.
GST Calculator
Add or remove GST and see the net, tax and gross amounts instantly.
Salary to Hourly Converter
Turn any annual salary into hourly, daily, weekly and monthly pay — or work it backwards.
US Sales Tax Calculator
Enter an amount and a state to get the sales tax and total — with a 50-state rate reference.
Overtime Pay Calculator
Turn a regular rate, base hours and one or more overtime multipliers into a full gross-pay breakdown.
Australia GST Calculator
Add or remove 10% GST instantly — with a full AUD breakdown.
Belgium VAT Calculator (TVA / BTW)
Add or remove Belgian VAT at 21%, 12%, 6% or 0% — instant net and gross breakdown.
Germany VAT Calculator (Mehrwertsteuer)
Add or remove German MwSt at 19%, 7%, or 0% — instant net/gross breakdown.
Ireland VAT Calculator
Add or remove Irish VAT instantly — 23%, 13.5%, 9% and 4.8% rates covered.
Italy VAT (IVA) Calculator
Add or remove Italian IVA at 22%, 10%, 5% or 4% — instant breakdown in euros.
New Zealand GST Calculator
Add or remove 15% NZ GST instantly — with a full breakdown.
Norway VAT (MVA) Calculator
Add or remove Norwegian merverdiavgift at 25%, 15%, and 12% in seconds.
Poland VAT Calculator
Add or remove Polish VAT (PTU) instantly — 23%, 8%, and 5% rates.
Singapore GST Calculator
Add or remove 9% GST in seconds — net, GST amount, and gross in one view.
Philippines VAT Calculator
Add or remove Philippine 12% EVAT — instant peso breakdown for any transaction.
UAE VAT Calculator
Add or remove UAE VAT at 5% or 0% — instant AED net/gross breakdown.
India GST Calculator — All Slabs: 5%, 12%, 18%, 28% + CGST/SGST Split
Add or extract GST at any slab rate with a full CGST/SGST/IGST breakdown.
Arizona Sales Tax Calculator 2025 — 5.6% State TPT Rate + Local
Add or remove Arizona sales tax with the real 5.6% state rate and editable local rate — instant browser calculation.
California Sales Tax Calculator
Add or reverse California sales tax in seconds — state 7.25% + your local rate.
Canada Sales Tax Calculator (GST/HST/PST) by Province 2025
Instantly calculate GST, HST, PST and QST for every Canadian province and territory.
Florida Sales Tax Calculator 2025 — 6% State Rate + County Surtax
Add or remove Florida sales tax instantly — state base rate preset, editable county surtax, full breakdown.
France VAT (TVA) Calculator
Add or remove French TVA at 20%, 10%, 5.5% or 2.1% — instant net/gross breakdown.
Illinois Sales Tax Calculator
Add or back out Illinois sales tax — state 6.25% plus your local rate.
Mexico VAT (IVA) Calculator — 16%, 8% Border Zone, 0%
Add or remove Mexican IVA at 16%, 8% border-zone, or 0% — full MXN breakdown instantly.
Michigan Sales Tax Calculator 2025 — 6% Flat State Rate
Add or remove Michigan's flat 6% sales tax instantly — no local rate complications.
Missouri Sales Tax Calculator
Instantly calculate Missouri sales tax — add tax to a price or strip it from a total.
Netherlands VAT (BTW) Calculator
Add or remove Dutch BTW at 21%, 9% or 0% — instant net/gross breakdown.
New York Sales Tax Calculator
Calculate NY sales tax instantly — add tax to a price or strip it from a total.
Ohio Sales Tax Calculator
Instantly calculate Ohio sales tax — add tax to a price or back it out of a total.
Pennsylvania Sales Tax Calculator
Calculate PA sales tax — add it to a price or back it out from a total.
Saudi Arabia VAT Calculator
Add or remove 15% Saudi VAT instantly — net, VAT amount and gross in one click.
South Africa VAT Calculator
Add or remove 15% South African VAT instantly — net, VAT amount and gross in one click.
Spain VAT (IVA) Calculator
Add or remove Spanish IVA instantly — 21%, 10% and 4% rate bands covered.
Switzerland VAT (MWST) Calculator 2025 — 8.1%, 3.8%, 2.6%
Add or remove Swiss MWST at 8.1%, 3.8% or 2.6% — instant CHF breakdown in your browser.
Texas Sales Tax Calculator
Calculate Texas sales tax instantly — add tax to a price or back it out of a total.
Alabama Sales Tax Calculator 2025 — 4% State Rate + Local
Add or remove Alabama sales tax with the real 4% state rate and editable local rate — instant browser calculation.
Massachusetts Sales Tax Calculator
Add or reverse Massachusetts sales tax instantly — state 6.25% + optional local meals rate.
Colorado Sales Tax Calculator 2025 — 2.9% State Rate + Local
Add or remove Colorado sales tax with the real 2.9% state rate and editable local rate — instant browser calculation.
Georgia Sales Tax Calculator 2025 — 4% State + Local Rate
Add or remove Georgia sales tax instantly — state 4% base plus editable local rate.
Indiana Sales Tax Calculator 2025 — 7% State Rate, No Local Tax
Add or remove Indiana sales tax with the real 7% state rate — instant browser calculation, no local tax complications.
Kenya VAT Calculator 2025 — 16% Standard & 8% Petroleum Rate
Add or remove Kenya VAT at the correct rate band — instant KSh breakdown in your browser.
Louisiana Sales Tax Calculator 2025 — 4.45% State Rate + Local
Add or remove Louisiana sales tax with the real 4.45% state rate and editable parish/city rate — instant browser calculation.
New Jersey Sales Tax Calculator 2025 — 6.625% State Rate
Add or remove New Jersey sales tax instantly — state rate preset, editable local field, full breakdown.
Nigeria VAT Calculator — 7.5% Value Added Tax (2025)
Add or remove Nigeria VAT at 7.5% — instant breakdown in your browser.
North Carolina Sales Tax Calculator 2025 — 4.75% State Rate + Local
Add or remove NC sales tax instantly — state 4.75% base, editable county rate, full breakdown.
Sweden VAT (Moms) Calculator 2025 — 25%, 12%, 6%
Add or remove Swedish Moms instantly — all four rate bands, full SEK breakdown.
Washington Sales Tax Calculator
Add or reverse Washington sales tax — 6.5% state base rate + editable local rate.
Maryland Sales Tax Calculator 2025 — 6% Flat State Rate
Add or remove Maryland sales tax instantly — 6% statewide, no local add-ons.
Minnesota Sales Tax Calculator
Add or reverse Minnesota sales tax instantly — state 6.875% + your local rate.
South Carolina Sales Tax Calculator 2025 — 6% State Rate + Local
Add or remove SC sales tax instantly — state 6% base, editable county rate, full breakdown.
Tennessee Sales Tax Calculator 2025 — 7% State Rate + Local Rate
Add or remove Tennessee sales tax instantly — 7% state base preset, editable local rate, full breakdown.
Virginia Sales Tax Calculator 2025 — 4.3% State + Local Rate
Add or remove Virginia sales tax instantly — state 4.3% base plus editable local/regional rate.
Wisconsin Sales Tax Calculator 2025 — 5% State Rate + Local
Add or remove Wisconsin sales tax using the real 5% state rate and an editable county/city rate — instant browser calculation.
Alabama Minimum Wage Calculator
Compute gross weekly, monthly and annual pay at the Alabama (federal) minimum wage, with overtime.
Arizona Minimum Wage Calculator
Compute gross weekly, monthly and annual pay at Arizona's $14.70/hr minimum — plus overtime.
Arkansas Minimum Wage Calculator
Compute gross weekly, monthly and annual pay at Arkansas's $11.00/hr minimum wage — with overtime.
California Minimum Wage Calculator
Compute weekly, monthly and annual gross pay at California's $16.50/hr minimum — with overtime.
Florida Minimum Wage Calculator
Compute gross weekly, monthly and annual pay at Florida's $13/hr minimum — with overtime.
New York Minimum Wage Calculator
Compute gross pay at New York's $16.50/hr minimum wage — weekly, monthly, and annual.
Oregon Minimum Wage Calculator
Compute gross pay weekly, monthly and annually for all three Oregon wage tiers (July 2025) — with overtime.
Alaska Minimum Wage Calculator
Compute gross weekly, monthly and annual pay at Alaska's $11.91/hr rate — with overtime.
Colorado Minimum Wage Calculator
Compute gross weekly, monthly and annual pay at Colorado's $14.81/hr minimum wage, with overtime.
Connecticut Minimum Wage Calculator
Compute gross weekly, monthly and annual pay at CT's $16.35/hr minimum wage — with overtime.
Hawaii Minimum Wage Calculator
Compute weekly, monthly and annual gross pay at Hawaii's $16/hr minimum — with overtime.
Illinois Minimum Wage Calculator
Compute weekly, monthly and annual gross pay at Illinois's $14/hr minimum — with overtime.
Maryland Minimum Wage Calculator
Compute gross pay at Maryland's $15.00/hr minimum — weekly, monthly, annual, with overtime.
Massachusetts Minimum Wage Calculator
Compute gross pay at the $15.00/hr MA minimum wage — weekly, monthly, annual, with overtime.
Michigan Minimum Wage Calculator
Compute gross weekly, monthly and annual pay at Michigan's $10.56/hr minimum wage, with overtime.
Missouri Minimum Wage Calculator
Compute gross weekly, monthly and annual pay at the Missouri minimum wage, with overtime.
Montana Minimum Wage Calculator
Calculate gross pay at Montana's $10.55/hr minimum wage — weekly, monthly and annual.
New Jersey Minimum Wage Calculator
Instantly compute gross weekly, monthly, and annual pay at New Jersey's $15.49/hr minimum wage — with overtime.
New Mexico Minimum Wage Calculator
Compute weekly, monthly and annual gross pay at the New Mexico minimum wage — with overtime.
Nebraska Minimum Wage Calculator
Compute gross weekly, monthly and annual pay at the Nebraska minimum wage of $13.50/hr, with overtime.
Ohio Minimum Wage Calculator
Compute gross weekly, monthly and annual pay at Ohio's $10.70/hr minimum wage, with overtime.
Maine Minimum Wage Calculator
Compute gross weekly, monthly and annual pay at Maine's $14.65/hr rate — with overtime.
Minnesota Minimum Wage Calculator
Compute gross weekly, monthly and annual pay at Minnesota's $11.13/hr minimum wage, with overtime.
Nevada Minimum Wage Calculator
Compute weekly, monthly and annual gross pay at Nevada's $12/hr minimum — with overtime.
Alabama Property Tax Calculator
Estimate your Alabama annual and monthly property tax from your home value and the state average effective rate.
Arizona Property Tax Calculator 2024 — Estimate Your Annual and Monthly Bill
Enter your home value and get an instant Arizona property-tax estimate using the real 0.51% statewide average effective rate.
California Property Tax Calculator
Estimate your annual and monthly California property tax using the real statewide average effective rate.
Colorado Property Tax Calculator
Estimate your annual and monthly Colorado property tax from your home value.
Florida Property Tax Calculator
Estimate your annual and monthly Florida property tax from home value and effective rate.
Georgia Minimum Wage Calculator
Compute gross weekly, monthly and annual pay at the Georgia (federal) minimum wage — overtime included.
Georgia Property Tax Calculator
Estimate your annual and monthly property tax bill for any Georgia county.
Iowa Minimum Wage Calculator
Compute gross weekly, monthly and annual pay at the Iowa minimum wage, with overtime.
Kentucky Minimum Wage Calculator
Compute gross weekly, monthly and annual pay at the Kentucky (federal) minimum wage, with overtime.
Pennsylvania Minimum Wage Calculator
Compute PA gross weekly, monthly and annual pay with overtime at the current state minimum wage.
Texas Minimum Wage Calculator
Compute gross weekly, monthly and annual pay at Texas minimum wage with overtime.
Louisiana Minimum Wage Calculator
Compute gross weekly, monthly and annual pay at the Louisiana (federal) minimum wage, with overtime.
Connecticut Property Tax Calculator
Estimate your annual and monthly CT property tax — with county breakdowns.
Idaho Minimum Wage Calculator
Compute gross weekly, monthly and annual pay at the Idaho minimum wage, with overtime.
Illinois Property Tax Calculator
Estimate your Illinois annual and monthly property tax from your home value and the state average effective rate.
Indiana Minimum Wage Calculator
Compute gross weekly, monthly and annual pay at the Indiana minimum wage, with overtime.
Kansas Minimum Wage Calculator
Compute gross weekly, monthly and annual pay at the Kansas minimum wage, with overtime.
Massachusetts Property Tax Calculator
Estimate your Massachusetts annual and monthly property tax from your home value and the state average effective rate.
Michigan Property Tax Calculator
Estimate your Michigan annual and monthly property tax from your home value and the state average effective rate.
Mississippi Minimum Wage Calculator
Compute gross weekly, monthly and annual pay at the Mississippi (federal) minimum wage, with overtime.
Missouri Property Tax Calculator
Estimate your Missouri annual and monthly property tax from your home value and the state average effective rate.
Nevada Property Tax Calculator
Estimate your Nevada annual and monthly property tax from your home value and the state average effective rate.
New Hampshire Minimum Wage Calculator
Compute gross weekly, monthly and annual pay at the New Hampshire (federal) minimum wage, with overtime.
New York Property Tax Calculator
Estimate your New York annual and monthly property tax from your home value and the state average effective rate.
North Carolina Minimum Wage Calculator
Compute gross weekly, monthly and annual pay at the North Carolina minimum wage, with overtime.
North Dakota Minimum Wage Calculator
Compute gross weekly, monthly and annual pay at the North Dakota (federal) minimum wage, with overtime.
Ohio Property Tax Calculator
Estimate your Ohio annual and monthly property tax from your home value and the state average effective rate.
Oklahoma Minimum Wage Calculator
Compute gross weekly, monthly and annual pay at the Oklahoma (federal) minimum wage, with overtime.
Oregon Property Tax Calculator
Estimate your Oregon annual and monthly property tax from your home value and the state average effective rate.
South Carolina Minimum Wage Calculator
Compute gross weekly, monthly and annual pay at the South Carolina (federal) minimum wage, with overtime.
South Dakota Minimum Wage Calculator
Compute gross weekly, monthly and annual pay at the South Dakota minimum wage, with overtime.
Tennessee Property Tax Calculator
Estimate your Tennessee annual and monthly property tax from your home value and the state average effective rate.
Texas Property Tax Calculator
Estimate your Texas annual and monthly property tax from your home value and the state average effective rate.
Wisconsin Minimum Wage Calculator
Compute gross weekly, monthly and annual pay at the Wisconsin minimum wage, with overtime.
Wyoming Minimum Wage Calculator
Compute gross weekly, monthly and annual pay at the Wyoming minimum wage, with overtime.
Rhode Island Minimum Wage Calculator
Compute gross weekly, monthly and annual pay at RI's $16.00/hr minimum wage — with overtime.
Minnesota Property Tax Calculator
Estimate your Minnesota annual and monthly property tax from your home value and the state average effective rate.
New Jersey Property Tax Calculator
Estimate your NJ annual and monthly property tax from your home value and the state average effective rate.
North Carolina Property Tax Calculator
Estimate your North Carolina annual and monthly property tax from your home value and the state average effective rate.
Pennsylvania Property Tax Calculator
Estimate your Pennsylvania annual and monthly property tax from your home value and the state average effective rate.
Tennessee Minimum Wage Calculator
Compute gross weekly, monthly and annual pay at the Tennessee (federal) minimum wage, with overtime.
Utah Minimum Wage Calculator
Compute gross weekly, monthly and annual pay at the Utah minimum wage, with overtime.
Virginia Property Tax Calculator
Estimate your Virginia annual and monthly property tax from your home value and the locality effective rate.
Washington State Minimum Wage Calculator
Compute gross weekly, monthly and annual pay at Washington's $16.66/hr minimum wage — with overtime.
Wisconsin Property Tax Calculator
Estimate your Wisconsin annual and monthly property tax from your home value and the state average effective rate.
Indiana Property Tax Calculator
Estimate your Indiana annual and monthly property tax from your home value and the state average effective rate.
Vermont Minimum Wage Calculator
Compute gross weekly, monthly and annual pay at the Vermont minimum wage, with overtime at 1.5x.
Washington Property Tax Calculator
Estimate your Washington annual and monthly property tax from your home value and the state average effective rate.
Virginia Minimum Wage Calculator
Compute gross weekly, monthly and annual pay at Virginia's $12.41/hr minimum wage, with overtime.
West Virginia Minimum Wage Calculator
Compute gross weekly, monthly and annual pay at the West Virginia minimum wage of $8.75/hr, with overtime.
Kinematics Calculator (SUVAT + Projectile)
Solve any SUVAT equation or projectile problem — pick the unknown and get full working.
Delaware Minimum Wage Calculator
Compute gross weekly, monthly and annual pay at Delaware's $15.00/hr minimum wage with overtime.
Activation Energy Calculator
Arrhenius equation, two-point Eₐ, first-order half-life and Eyring–Polanyi in one tool.
Boiling Point Elevation Calculator
Calculate ΔTb = i · Kb · m — solve for elevation, Kb, molality or Van't Hoff factor.
Elevation Grade Calculator
Convert between slope grade %, angle, rise, run and slope distance instantly.
Medical & Clinical
APGAR Score Calculator
Neonatal assessment at 1, 5, and 10 minutes after birth
Blood Alcohol Concentration Estimator (Widmark)
Estimate BAC from drinks consumed, weight, and time elapsed
BUN:Creatinine Ratio Calculator
Classify azotaemia as pre-renal, intrinsic renal, or post-renal
Corrected Gestational Age for Premature Infants
Compute developmental corrected age from birthdate and gestation
Corrected Calcium for Albumin
Adjust serum calcium when albumin is abnormal
Paediatric GFR Estimator (Schwartz Formula)
Estimate GFR in children from height and serum creatinine
Creatinine Clearance (Cockcroft-Gault)
Estimate kidney function for drug dosing adjustments
Cystatin C-Based eGFR Calculator (CKD-EPI Cys)
GFR estimate using cystatin C alone or combined with creatinine
Creatinine Unit Converter (mg/dL to umol/L)
Convert serum creatinine between US and SI units
Drug Dose by BSA Calculator
Body surface area-based dosing for chemotherapy and specialty drugs
eGFR Calculator (CKD-EPI & MDRD)
Estimate GFR and CKD stage with two validated equations
GFR-Based CKD Staging Tool
Map any eGFR value to its KDIGO CKD G-stage
Mean Arterial Pressure (MAP) Calculator
Calculate MAP from systolic and diastolic blood pressure
TBSA Burn Calculator (Rule of Nines & Lund-Browder)
Estimate total body surface area burned for resuscitation.
Protein:Creatinine Ratio & Albumin:Creatinine Ratio Calculator
Estimate 24-hour proteinuria from a spot urine sample
Urine Anion Gap Calculator
Classify metabolic acidosis as GI versus renal bicarbonate loss
Blood Alcohol Content (BAC) Calculator
Estimate your BAC with the Widmark formula — never use it to decide to drive.
Metabolic Age Calculator
Estimate your metabolic age from your BMR.
Anion Gap Calculator
Instantly compute anion gap, albumin-corrected AG, delta ratio and osmolar gap.
APGAR Score Calculator
Assess a newborn's health at birth with the standard five-criterion APGAR scale.
Body Surface Area (BSA) Calculator
Calculate BSA using Mosteller, DuBois, Haycock and three more formulae — instantly in your browser.
Cat Years Calculator
Find out how old your cat is in human years — with life-stage guidance.
Corrected Calcium Calculator
Adjust serum calcium for low or high albumin using the Payne formula.
Creatinine Clearance Calculator (Cockcroft-Gault)
Estimate kidney function for drug dosing using the Cockcroft-Gault equation.
eGFR Calculator (CKD-EPI 2021)
Estimate kidney function from serum creatinine using the latest race-free equation.
Gestational Age Calculator
Find out exactly how far along you are — in weeks and days.
eGFR Calculator (CKD-EPI 2021)
Estimate kidney function using the latest race-free CKD-EPI 2021 equation.
MAP Calculator (Mean Arterial Pressure)
Instantly compute Mean Arterial Pressure from systolic and diastolic readings.
Mean Arterial Pressure (MAP) Calculator
Instantly compute MAP from systolic and diastolic blood pressure readings.
Pet Age Calculator
Convert your pet's age to a human-equivalent age using real veterinary science.
QTc Interval Calculator
Correct the QT interval for heart rate using Bazett, Fridericia, Framingham and Hodges formulas.
Dog Years Calculator
Convert your dog's age to human years with size-aware milestones and life-stage analysis.
Caffeine Half-Life Calculator
See exactly how much caffeine is still in your system and when you can safely sleep.
Glycemic Load Calculator
Calculate the glycemic load of any meal from a database of 60+ foods.
Sugar Intake Calculator
Track your daily sugar consumption against WHO, AHA and NHS limits.
Fiber Intake Calculator
Find your daily fiber target and track it food by food.
Sodium Intake Calculator
Track your daily sodium and salt intake against WHO, AHA and NHS limits.
Standard Drink Calculator
Convert any drink into standard units for US, UK, Australia and Canada.
Health & Fitness
BMI / BMR / TDEE Calculator
Body mass index, basal metabolic rate and daily calorie needs in one tool.
Pregnancy Due Date Calculator
Estimated due date, gestational age and trimester from your last period.
Aquarium Protein Skimmer Sizing Calculator
Match protein skimmer rated volume to your actual bioload
Beer Calories & Carbs Calculator
Estimate calories and carbohydrates per serving from OG and FG
Bellows & Extension Tube Exposure Calculator
Calculate exposure increase and magnification for bellows and tubes
Close-Up Lens Diopter Calculator
Find magnification and focus distance for close-up filters
Macro Lens Working Distance Calculator
Calculate working distance from front element to subject at any magnification
Macro Focus Stacking Step Calculator
Calculate focus step distance for complete depth-of-field coverage in macro stacks
Pet Body Condition Score Calculator
Estimate your dog or cat's body condition score from a quick check
Pet Gestation & Due Date Calculator
Calculate expected due date for dogs, cats, rabbits, and guinea pigs
Beer-Lambert Protein Concentration Calculator
Quantify protein concentration from absorbance and an extinction coefficient
Adult BMI Calculator & WHO Classification
BMI from height and weight with underweight to obese classification
Obesity Class & Drug Dosing Weight Selector
Pick the right dosing weight (ABW, IBW, AdjBW, LBW) by drug class
Pediatric BMI Percentile Calculator (CDC)
Age- and sex-adjusted BMI percentile for children 2-20
Lean Body Weight Calculator (Janmahasatian)
LBW for drug dosing in obese and normal-weight patients
Cardiovascular Lipid Risk Calculator (Framingham)
10-year CVD risk from lipid panel, age, sex, BP, and smoking
BCA / Bradford Protein Assay Standard Curve Calculator
Fit a protein standard curve and read off unknown concentrations
Protein Yield & Recovery Calculator
Track total protein, activity, and purification fold across fractions
Oral Rehydration Solution Dosing Calculator
Calculate ORS volume for mild and moderate dehydration
BMR Calculator
Your Basal Metabolic Rate with the Mifflin-St Jeor equation.
TDEE Calculator
Total Daily Energy Expenditure from BMR and activity level.
Body Fat Calculator
Estimate body fat percentage with the US Navy method.
Ideal Weight Calculator
Ideal body weight from four classic formulas.
Lean Body Mass Calculator
Lean mass and fat mass from the Boer formula.
Calorie Deficit Calculator
Find your daily calorie target for steady, safe weight loss.
Macro Calculator
Split your daily calories into protein, carbs and fat in grams.
Water Intake Calculator
Estimate how much water to drink each day for your body and activity.
Running Pace Calculator
Work out pace, finish time or distance for any run.
One Rep Max Calculator
Estimate your 1RM and training weights from a set you can do.
Sleep Cycle Calculator
Find the best bedtime or wake-up time around 90-minute cycles.
Joules to Calories Converter
Convert J to cal instantly — 1 cal = 4.184 J. Free, browser-only tool.
Pregnancy Week Tracker
See how many weeks pregnant you are, your trimester and your due date.
Calorie Burn by Activity Calculator
Estimate calories burned for any activity using MET values.
BMI Prime Calculator
Express your BMI as a ratio to the healthy-weight ceiling of 25.
Waist-to-Height Ratio Calculator
Check if your waist is less than half your height — a simple health screen.
VO2 Max Calculator
Estimate your VO2 max from resting HR, a Cooper run or a Rockport walk.
Waist-to-Hip Ratio Calculator
Divide waist by hip and see your WHO health-risk band.
Protein Intake Calculator
How much protein per day for maintenance, muscle gain or fat loss.
Max Heart Rate Calculator
Your maximum heart rate plus five training zones, with Karvonen support.
Running Pace Converter
Convert between min/km, min/mile, km/h and mph instantly.
Pregnancy Weight Gain Calculator
Check your pregnancy weight gain against IOM guidelines by week.
Calories In vs Out Calculator
See your daily calorie balance and projected weight change.
Joules to Food Calories Converter
Convert joules to nutrition-label Calories (kcal) and back.
Calories to Joules Converter
Convert small (gram) calories to joules and back, exactly.
Target Heart Rate Zone Calculator
Training zones by Karvonen or percentage of max HR.
Calories Per Meal Planner
Split your daily calorie target across meals.
Steps to Calories Calculator
Convert your step count into calories burned.
Pregnancy Trimester Calculator
Find your trimesters, due date and gestational age.
BMI-for-Age Percentile Calculator
Child & teen BMI percentile using CDC growth charts.
Marathon Time Predictor
Predict your marathon finish from a recent race using the Riegel formula.
VDOT Running Calculator
Find your VDOT fitness score from any race time (Daniels–Gilbert model).
Swim Pace Calculator
Work out your pace per 100 m or 100 yd and average swim speed.
Calories to Kilojoules Converter
Convert food calories (kcal) to kilojoules, both directions.
Kilojoules to Calories Converter
Convert kilojoules to food calories (kcal), both directions.
Heart Rate Recovery Calculator
How fast your pulse drops after exercise.
Pace Per Kilometer Calculator
Turn distance and time into min/km, min/mile and km/h.
Daily Calorie Cycling Calculator
Split your weekly calories into high and low days.
Hydration Reminder Calculator
Your daily water target and a drink-every-X-minutes schedule.
Workout Program Builder
Build a weekly training split, track sets and reps, and export a printable PDF.
Macro Meal Planner
Plan a day of meals, hit your protein, carb and fat targets, export the plan.
Workout Log
Track sets, reps and weight per session — with history and personal-best highlights.
BMR & TDEE Calculator
Find your BMR, daily calorie burn and goal calorie targets in seconds.
Calorie & Macro Daily Tracker
Log foods against calorie and macro targets with live progress rings.
Body Fat Calculator (US Navy Method)
Estimate body fat % from a tape measure using the US Navy formula.
Sleep Cycle Calculator Pro
Bedtime, wake-up and nap times tuned to your own 90-minute cycles.
Heart Rate Zone Calculator
Turn your age and resting pulse into five training zones with exact BPM ranges.
One Rep Max Calculator (Pro)
Estimate your 1RM from seven formulas, with a full training-percentage table in kg and lb.
Water Intake Calculator (Advanced)
Personalised daily water target from weight, age, activity and climate.
BMI Calculator with Healthy Weight Range
Body mass index, your category, and the healthy weight range for your height.
Running Pace Calculator Pro: Pace, Time, Distance + Splits
Enter any two of pace, time and distance — get the third, plus splits and race predictions.
Sourdough Hydration & Baker's Percentage Calculator
Find your dough hydration and every baker's % in one click.
Pace Per Mile Calculator
Find your pace, finish time or distance — in minutes per mile.
Rowing Split Calculator
Convert your split to watts, calories and total time — or find the split you need to hit a goal time.
Steps to Miles Calculator
Convert any step count to miles and kilometres instantly.
Calories Burned Cycling Calculator
Find out exactly how many calories you burn on every ride.
Calories Burned Swimming Calculator
Find out exactly how many calories you burn for every stroke and session.
FFMI Calculator
Calculate your Fat-Free Mass Index and see how your muscularity compares.
Heart Rate Reserve Calculator
Find your true Karvonen training zones using the HRR method.
Marathon Pace Predictor
Goal time, training zones, negative splits and 5-km split cards — all from one number.
Plate Loading Calculator
Instantly know which plates to load on each side of the bar — kg and lb.
Running Cadence Calculator
Find your ideal steps per minute from speed and stride length.
Steps to Calories Calculator
Convert any step count to calories burned — with distance, pace, fat burned, and daily projections.
Wilks Calculator
Compare your powerlifting total across any bodyweight class.
Calories Burned Running Calculator
Find out exactly how many calories your run burns — by speed, weight and distance or time.
DPI / Dots Calculator
Calculate PPI for screens and DPI for print — find the right resolution in seconds.
Beep Test Calculator
Find your VO2 max and fitness rating from your 20m shuttle run level and shuttle.
Brzycki 1RM Calculator
Estimate your one-rep max from any rep-weight set using the Brzycki formula.
Cooper Test Calculator
Estimate VO2max from your 12-minute run — with age and sex fitness norms.
Epley 1RM Calculator
Estimate your one-rep max from any submaximal lift in seconds.
Treadmill Pace Converter
Convert treadmill speed to running pace, finish times and calorie burn instantly.
Calorie Cycling Calculator
Plan high, medium, low and rest-day calories around your training week.
RPE Load Calculator
Translate Rate of Perceived Exertion to exact training loads using the Tuchscherer RTS chart.
Waist-to-Height Ratio Calculator
Check your central obesity risk with the simple keep-your-waist-to-half-your-height rule.
Waist-to-Hip Ratio Calculator
Calculate your WHR, see your WHO risk band, and solve for the waist size you need.
Wendler 5/3/1 Calculator
Generate your full 4-week 5/3/1 cycle — sets, weights, AMRAP targets and progression.
Grade Adjusted Pace Calculator (GAP)
Find your flat-equivalent running pace on any hill using the Minetti metabolic model.
Reverse Diet Calculator
Ramp calories back to maintenance with minimal fat gain.
Running Economy Calculator
Calculate your oxygen cost per km, energy cost (Cr) and running efficiency from a sub-maximal VO2 test.
TDEE Calculator — Katch–McArdle & Cunningham
The most accurate lean-mass TDEE: Katch–McArdle + Cunningham, with solve-for-body-fat mode.
Pregnancy Due Date Calculator
Find your estimated due date using LMP, conception, IVF transfer, or ultrasound dating.
Ovulation Calculator
Find your fertile window and estimated ovulation date for the next 1–6 cycles.
Pregnancy Week Calculator
Find out exactly which week of pregnancy you are in and see what comes next.
Running Pace to Speed Converter (Tempo to mph / km/h)
Convert any running pace to mph, km/h and m/s — plus instant race finish times.
Army Body Fat Calculator
Estimate body fat with the official U.S. Army AR 600-9 circumference formula and check your Army standard.
Fat-Burning Zone Calculator
Find the exact heart-rate range where your body burns the most fat per minute.
Hydration During Exercise Calculator
Know exactly how much to drink before, during and after your workout.
Protein Per Meal Calculator
Find out exactly how much protein to eat at each meal for your body weight and goal.
Heart Rate Zone Calculator
Find your 5 training zones using Karvonen or % Max HR.
Target Heart Rate Calculator
Find your ideal training heart-rate zone for any fitness goal.
VO2max From Race Time Calculator
Derive your VDOT and five training pace zones from any recent race result.
Calories in Recipe Calculator
Total calories, macros and per-serving breakdown for any home-cooked dish.
Chemistry
Aquarium CO2 / pH / KH Calculator
Calculate dissolved CO2 from measured pH and carbonate hardness
D&D Polymorph Stat Block Reference
Quick lookup of CR-appropriate polymorph target stat blocks
Garden Soil pH Amendment Calculator
Calculate lime or sulfur needed to adjust soil pH to target
Mash pH Estimator
Estimate mash pH from grain bill, water profile, and acid additions
Sour Beer Lactic Acid Titration Calculator
Estimate lactic acid additions to reach a target pH in finished sour beer
Wort Dilution & Boil-Off Calculator
Calculate post-dilution or post-boil gravity from volume changes.
Economizer Changeover Temperature & Enthalpy Calculator
Find the dry-bulb and differential-enthalpy changeover points for an air-side economizer
Dilution Calculator (C₁V₁ = C₂V₂)
Calculate stock solution volumes for any target concentration
Dilution Factor & Back-Calculation Tool
Find dilution factor and original concentration from a diluted sample
Freezing Point Depression Calculator
Calculate delta Tf and osmolality of solutions for formulation
Henderson-Hasselbalch Buffer pH Calculator
Calculate buffer pH from pKa and acid/base concentrations
Air Enthalpy Calculator (HVAC)
Moist-air enthalpy in BTU/lb from dry-bulb and wet-bulb or relative humidity
Antibody Dilution Calculator for IHC / ICC
Calculate working dilution volumes for immunohistochemistry antibody solutions
Knots / MPH / km/h / m/s Speed Converter
Convert between nautical, imperial, and metric speed units instantly
Ligation Molar Ratio Calculator (Insert:Vector)
Calculate insert mass for a 3:1 or custom molar ratio in cloning
MIC Dilution Series Planner
Plan two-fold dilution series for minimum inhibitory concentration testing
Osmolarity of Solution Calculator
Calculate solution osmolarity from solute concentrations and dissociation
ppm / ppb / % Concentration Converter
Convert between ppm, ppb, mg/L, g/L, and % for solutions
Reagent Preparation & Dilution Planner
Plan a serial dilution series with per-tube transfer and diluent volumes
Serial Dilution Calculator
Calculate concentrations across every step of a serial dilution series
Serum Osmolality & Osmol Gap Calculator
Estimate osmolality and osmol gap to screen for toxic alcohols
Acid-Base Titration Calculator
Calculate titre volume, equivalence point, and concentration
Token Dilution & Fully Diluted Valuation Calculator
Calculate FDV, circulating market cap, and dilution from future unlocks
Urine Specific Gravity to Osmolality Converter
Convert urine SG to approximate osmolality for hydration assessment
Miles per Hour to Kilometres per Hour Converter
Convert mph to km/h instantly — 1 mph = 1.609344 km/h. Free, browser-only tool.
Miles per Hour to Knots Converter
Convert mph to kn instantly — 1 mph = 0.868976 kn. Free, browser-only tool.
Percent Yield Calculator
Percent yield from actual and theoretical yield — or solve either.
Ideal Gas Law Calculator
Solve PV = nRT for pressure, volume, moles or temperature — with units and steps.
Molarity Calculator
Solve for molarity, moles, mass or volume — with grams to moles built in.
pH Calculator
Convert between pH, pOH, [H⁺] and [OH⁻], and get pH from strong acid or base concentration.
Dilution Calculator (C1V1 = C2V2)
Solve the dilution equation for any concentration or volume, with units.
Molar Mass Calculator
Molar mass of any chemical formula, with per-element breakdown.
Cocktail Dilution Calculator
Know exactly how much ice water enters your drink — and where your ABV lands.
Titration Calculator
Find analyte concentration, titrant volume or equivalence point from any three knowns.
Ideal Gas Law Calculator (PV = nRT)
Solve for pressure, volume, moles or temperature — with full unit conversion.
Combined Gas Law Calculator
Solve P₁V₁/T₁ = P₂V₂/T₂ — plus Boyle, Charles, Gay-Lussac and the Ideal Gas Law.
Empirical Formula Calculator
Find the empirical and molecular formula from mass percentages or masses.
Enthalpy Calculator
Hess's Law, Gibbs ΔG, bond enthalpies, Kirchhoff, calorimetry — all in one tool.
Entropy & Gibbs Free Energy Calculator
Calculate ΔS, ΔG, Boltzmann entropy and more — six thermodynamic laws in one tool.
Equilibrium Constant Calculator
Kc, ICE tables, van't Hoff and Q vs Kc — all in one tool.
Gibbs Free Energy Calculator
Calculate ΔG, ΔH, ΔS, equilibrium constants and Nernst cell potentials instantly.
Molality Calculator
Calculate molality, solute mass, solvent mass, or molar mass — with full working shown.
pH and pOH Calculator
Convert between pH, pOH, and ion concentrations — with Henderson–Hasselbalch, buffer capacity, and dilution.
PPM Calculator
Convert ppm to molarity, run Beer-Lambert, dilute to a target concentration — all in one place.
Rate of Reaction Calculator
Arrhenius, rate laws, half-lives, activation energy — six chemistry modes in one tool.
Stoichiometry Calculator
Molar mass, limiting reagent, percent yield, molarity and ideal gas law — all in one place.
Atom Economy Calculator
Atom economy, E-factor, PMI, RME and mass balance — green chemistry metrics in one tool.
Beer-Lambert Law Calculator
Solve for absorbance, concentration, molar absorptivity, or path length instantly.
Boyle's Law Calculator
Solve P₁V₁ = P₂V₂ instantly — find any missing pressure or volume.
Charles's Law Calculator
Solve V1/T1 = V2/T2 instantly — find any gas volume or temperature at constant pressure.
Dalton's Law of Partial Pressures Calculator
Compute total pressure, partial pressures and mole fractions for any gas mixture.
Freezing-Point Depression Calculator
Calculate ΔTf, molality, Kf, or the van t Hoff factor — with full step-by-step working.
Gay-Lussac's Law Calculator
Solve P1/T1 = P2/T2 instantly — pressure, temperature, or both.
Graham's Law of Effusion Calculator
Compare gas effusion rates using r₁/r₂ = √(M₂/M₁). Solve for rate ratio, individual rate, or unknown molar mass.
Henderson-Hasselbalch Calculator
Solve pH, pKa, [A⁻] or [HA] with full step-by-step working.
Limiting Reagent Calculator
Find the limiting reagent, theoretical yield, excess amounts and percent yield instantly.
Mole Fraction Calculator
Find mole fractions, mole percentages and partial pressures for any gas or liquid mixture.
Normality Calculator
Calculate normality, equivalent weight, molarity conversions, dilutions and titration endpoints.
Osmotic Pressure Calculator (van 't Hoff: π = iMRT)
Solve for osmotic pressure, concentration, temperature or the van 't Hoff factor — with full unit support.
Theoretical Yield Calculator
Find theoretical yield, percent yield, or actual yield — with full stoichiometric working.
Nernst Equation Calculator
Calculate cell potential, standard E°, electrons transferred, reaction quotient or temperature — with full step-by-step working.
Percent Composition Calculator
Find the mass percent of every element in any chemical formula instantly.
Scoville Dilution Calculator
Calculate how much diluent to add to hit your target heat level.
Physics
Crossbow Kinetic Energy Calculator
Calculate crossbow bolt kinetic energy and momentum for ethical hunting.
HVAC Duct Sizing Calculator (Equal-Friction Method)
Size round and rectangular ducts from target friction rate and CFM using ASHRAE equal-friction
Newtonian Telescope Collimation Offset Calculator
Calculate secondary mirror offset for any Newtonian reflector
Concrete Pump Friction Loss Calculator
Estimate line pressure loss for concrete pump hose and pipe runs
HVAC Duct Friction Loss Calculator
Calculate friction loss in inches WC per 100 ft for round sheet-metal duct
One-Compartment PK Parameter Calculator
Estimate Cmax, Cmin, AUC, t½, and Vd from two drug levels
Pipe Thermal Expansion Calculator
Calculate thermal growth for copper, steel, PEX, and CPVC pipe over a temperature range
Momentum Calculator
Momentum p = m × v and impulse J = F × t, instantly.
Gravitational Force Calculator
Newton's law of gravitation: F = G·m₁·m₂ / r².
Newtons to Pounds-force Converter
Convert newtons to pounds-force instantly — 1 lbf = 4.4482216 N. Free, browser-only.
Escape Velocity Calculator
Work out the speed needed to escape any body's gravity.
Orbital Period Calculator
Compute how long one orbit takes with Kepler's third law.
Celsius to Newton Scale Converter
Convert °C to the historic Newton temperature scale, both ways.
Kinetic Energy Calculator
Solve KE = ½ m v² for energy, mass, or velocity — with full working shown.
Power-to-Weight Ratio Calculator
Compare two vehicles' power-to-weight ratios in W/kg, kW/t and hp/t.
Projectile Motion Calculator
Launch speed and angle to range, max height, flight time — with trajectory chart.
Doppler Shift Calculator
Calculate observed frequency, redshift and wavelength change for sound or light.
Lens Equation Calculator
Solve the thin lens equation for f, do or di — plus magnification, optical power and a live ray diagram.
Pressure at Depth Calculator
Calculate hydrostatic pressure at any depth — gauge and absolute, any fluid.
Reynolds Number Calculator
Predict laminar, transitional or turbulent flow — solve for Re, velocity, length or viscosity.
Terminal Velocity Calculator
Calculate the terminal velocity of any falling object using real aerodynamics.
Buoyancy Calculator
Compute buoyant force, fluid density, or submerged volume using Archimedes' principle.
Gas Density Calculator
Calculate gas density from pressure, temperature and molar mass — or solve for P or T.
Pendulum Period Calculator
Calculate period, length or gravity for a simple pendulum using T = 2π√(L/g).
Snell's Law Calculator
Compute refracted angle, incident angle, or refractive index — with critical-angle and Fresnel reflectance.
Specific Heat Calculator
Calculate heat energy, mass, specific heat capacity or temperature change using Q = m·c·ΔT.
Spring Constant Calculator
Hooke's Law — solve for k, force, or displacement with elastic PE and natural frequency.
Thermal Expansion Calculator
Calculate linear, area and volumetric expansion for 30 materials using ΔL = α · L₀ · ΔT
Angular Velocity Calculator
Calculate angular velocity, centripetal acceleration, tangential speed and more — with unit conversions.
Free Fall Calculator
Solve distance, time, velocity or g for any free-fall problem — Earth, Moon, Mars and beyond.
Friction Calculator
Compute friction forces, normal forces, slip angles and incline acceleration — with full working shown.
Power Physics Calculator
Solve P = W/t, P = Fv, P = τω, P = VI, P = I²R, hydraulic, rotational KE and more — with full working shown.
Banking Angle Calculator
Find the ideal banking angle, speed, or curve radius for any banked turn.
Coulomb's Law Calculator
Calculate electrostatic force between two point charges — solve for F, q₁, q₂, or r.
de Broglie Wavelength Calculator
Calculate the quantum wavelength of any moving particle — electrons, protons, neutrons, or custom masses.
Frequency and Period Calculator
Instantly convert between frequency f, period T, and angular frequency omega — with unit-aware results across Hz to THz.
Gravitational Force Calculator
Newton's universal gravitation: F = G * m1 * m2 / r2. Solve for any variable.
Impulse Calculator
Solve J = F·Δt or J = m·v_f − m·v_i with step-by-step working.
Kinetic Friction Calculator
Calculate friction force, stopping distance, incline dynamics and work done by friction.
Moment of Inertia Calculator
Compute I for 11 shapes, solve rotational KE and angular momentum — with the parallel axis theorem built in.
Newton's Second Law Calculator
F = ma — solve for force, mass, acceleration plus impulse, work, friction, circular motion, and inclined planes.
Orbital Velocity Calculator
Find the speed needed for a circular orbit around any body — with escape velocity, period and geostationary orbit.
Torque Physics Calculator
Solve torque, angular acceleration, rotational power, work, and lever balance — with full working shown.
Work & Energy Calculator
Solve work, KE, PE, power, momentum, impulse, collisions and centripetal force — with full working shown.
Centripetal Force Calculator
Solve F = m·v²/r instantly — force, mass, velocity, or radius.
Gravitational Potential Energy Calculator
Calculate PE = mgh instantly — solve for energy, mass, height, or g.
Hooke's Law Calculator
Solve F=kx, elastic PE, series/parallel springs and SHM oscillation — with full working.
Projectile Range Calculator
R = v₀²·sin(2θ)/g — range, height, flight time, impact speed.
Wave Speed Calculator
v = f × λ — solve for wave speed, frequency, wavelength, or period.
Electronics
Audio Transformer Turns Ratio & Impedance
Calculate turns ratio and impedance transformation for audio transformers
Battery Backup (UPS) Load & Runtime Calculator
Calculate UPS kVA, battery amp-hours, and backup runtime for critical loads.
Battery Bank Sizing Calculator (Off-Grid Solar)
Size a 12/24/48 V battery bank by daily load, days of autonomy, and depth of discharge.
RC Circuit Charge / Discharge Time Calculator
Calculate RC time constant, voltage at any time, and 5 tau full-charge time
Control Transformer Sizing Calculator
Size a control power transformer for a control panel load list with inrush allowance.
dB to Voltage Gain Converter
Convert between dB values and voltage gain/attenuation ratios instantly.
Drone Battery Cell Count & Voltage Calculator
Understand LiPo cell count, nominal, and charged voltage
kVA to Amps Converter
Convert kilovolt-amperes to amps for single-phase, split-phase, and three-phase systems
LED Retrofit Savings Calculator
Calculate annual energy and cost savings when replacing fluorescent or HID fixtures with LED
LiPo Battery Capacity & Flight Time Calculator
Calculate RC/drone flight time from battery capacity and current draw
Power Factor Correction Capacitor Calculator
Size a capacitor bank to correct power factor from a measured PF to a target PF
PV String Voc Temperature Correction Calculator
Correct PV module open-circuit voltage for minimum site temperature per NEC 690.7
Sealed Subwoofer Box Volume Calculator
Size a sealed sub box from Thiele-Small parameters and read its Qtc and Fc.
Transformer kVA Calculator
Determine required transformer kVA from load amps, voltage, and phase
Wire Gauge Selector
Choose the correct AWG or kcmil conductor for any load current with ampacity derating
Three-Phase Voltage Imbalance Calculator
Calculate percent voltage unbalance per NEMA MG1 and flag motor derating requirements.
Battery Charger Sizing Calculator
Size a 12/24/48 V battery charger from bank Ah capacity and recharge time
EU Battery Regulation Compliance Checker
Check battery product compliance with EU Regulation 2023/1542
Battery State of Charge (SoC) Estimator
Estimate lead-acid or lithium battery SoC from resting voltage or Peukert-corrected Ah.
Chilled Water Pipe Sizing Calculator
Size chilled-water piping by GPM and ASHRAE velocity limits, with head loss
CTWD / Contact-Tip-to-Work Distance Calculator
Find voltage drop and burnback risk from CTWD change in MIG welding
Deck Ledger Bolt Calculator
Calculate ledger-to-house bolt count and spacing from deck size
Emergency Lighting Battery Runtime Calculator
Verify emergency lighting fixture battery runtime meets NFPA 101 90-minute minimum requirement.
HAS-BLED Bleeding Risk Score
Estimate major bleeding risk before anticoagulation in AF
High-Leg Delta Voltage Calculator
Find the wild-leg voltage on a 120/240 V delta service and confirm phase B marking
LED Lighting Savings Calculator
Calculate energy savings and payback from switching to LED bulbs
Medium-Voltage Cable Sizing Calculator (5–35 kV)
Size MV feeder cables for shielded 5 kV–35 kV systems with ampacity and voltage-drop check.
RE100 Renewable Energy Pledge Progress Calculator
Track annual renewable energy percentage progress toward a 100% RE target
Solar + Battery Hybrid System Sizing Calculator
Jointly size solar array, battery bank and hybrid inverter for a self-consumption system.
Transformer Efficiency & No-Load Loss Calculator
Efficiency at partial load and annual no-load energy from core-loss spec
Underground Conduit Burial Depth Checker (NEC 300.5)
Verify NEC Table 300.5 minimum burial depth for conduit and direct-buried cable by method.
Resistor Color Code Calculator
Decode 4-band resistor colour bands to ohms.
Decibel (dB) Calculator
Convert a power or amplitude ratio to decibels.
Ohm's Law Calculator
Enter any two of V, I, R or P — get the other two with the formula wheel.
Resistor Color Code Calculator
Decode 4, 5 and 6-band resistors — or work backwards from a value to the colours.
Battery Life Calculator
Capacity, load and efficiency → exact runtime hours, minutes and a discharge curve.
Capacitor Code Calculator
3-digit EIA code to capacitance — and back. With tolerance band and voltage rating.
LED Resistor Calculator
Series resistor, nearest E12/E24 value and power rating — instantly.
Voltage Divider Calculator
Solve for Vout, Vin, R1 or R2 — with current, power and full working.
Wire Gauge (AWG) Calculator
AWG to diameter, ampacity with derating, and voltage drop for any run length.
555 Timer Calculator
Astable frequency, duty cycle and monostable pulse width — with full working.
LC Resonant Frequency Calculator
Find the resonant frequency, inductance, or capacitance of any LC tank circuit instantly.
Op-Amp Gain Calculator
Instantly calculate voltage gain, bandwidth and resistor values for any op-amp configuration.
PC Power Supply Calculator
Find the right PSU wattage for your build — CPU, GPU, storage and all.
Voltage Drop Calculator
Calculate voltage drop for any cable run — or find the minimum wire size for a target drop limit.
Antenna Length Calculator
Calculate the exact physical length for any antenna type from frequency — or find the resonant frequency from a known length.
Battery Runtime Calculator
Peukert-corrected runtime, required capacity, and max load for any battery pack.
Capacitor Charge Calculator
Calculate charge, voltage, capacitance, energy stored and dynamic charge/discharge voltage in an RC circuit.
Capacitor Parallel & Series Calculator
Instantly find the total capacitance of any combination of capacitors in parallel or series.
Decibel Distance Calculator
How loud is a sound at a different distance? Instant inverse-square-law answer.
Generator Sizing Calculator
Calculate the exact kVA rating you need — with motor surge, altitude and temperature derating.
RC Time Constant Calculator
Calculate τ = R × C, cutoff frequency, and capacitor voltage at any time.
Resistor Parallel Calculator
Equivalent resistance, conductance breakdown and solve-for-missing-R — all in one tool.
Transformer Turns Ratio Calculator
Compute secondary voltage, current, reflected impedance and winding counts for any transformer.
UPS Runtime Calculator
How long will your UPS last? Peukert-corrected battery runtime with real efficiency losses.
Resistor Series Calculator
Total resistance, current, voltage drops and power for any series resistor network.
Solar Battery Bank Calculator
Size a solar battery bank with the correct Ah formula — autonomy, DoD, efficiency, cell config.
Dipole Antenna Calculator
Instantly calculate half-wave dipole, quarter-wave monopole, and full-wave loop lengths for any frequency.
Capacitance Calculator
Parallel-plate, charge-voltage, energy stored, RC time constant, series and parallel combinations — all in one tool.
Inductance Calculator
Calculate inductance, reactance, energy, RL time constant and series/parallel combinations.
Resistivity Calculator
Calculate wire resistance, resistivity, length or cross-sectional area — with temperature correction.
Magnetic Force Calculator
Calculate Lorentz force on a charge, on a wire, or between two parallel wires — solve for any variable.
Decibel to Watt Calculator
Convert dB levels to watts (and watts to dB) with full working shown.
ADC Resolution Calculator
Compute LSB voltage, SNR, ENOB, quantisation noise and dynamic range for any ADC.
Amps to Watts Calculator
Convert amps to watts (or watts to amps) for DC, AC single-phase and AC three-phase circuits.
Capacitor Energy Calculator
Calculate the energy stored in a capacitor — plus series/parallel networks and RC discharge power.
Frequency to RPM Calculator
Convert Hz, kHz, rad/s and RPS to RPM — and back — instantly.
kVA to kW Calculator
Convert apparent power to real power instantly — single-phase and three-phase.
kW to kVA Calculator
Convert real power (kW) to apparent power (kVA) using power factor.
Power Dissipation Calculator
Calculate real, apparent and reactive power for DC circuits, AC single-phase and three-phase systems, plus junction temperature from thermal resistance.
Three-Phase Power Calculator
Calculate kW, kVA, kVAR, current and voltage for balanced three-phase AC systems.
Voltage Divider Output Calculator
Compute loaded and unloaded Vout, loading error, power, and nearest E-series resistor.
Watts to Amps Calculator
Convert watts to amps for DC, single-phase AC, and three-phase AC circuits.
Wire Resistance Calculator
Calculate conductor resistance, voltage drop and power loss for any material, length and cross-section.
Conduit Fill Calculator
Check NEC conduit fill compliance — pick a conduit, add wires, get the fill percentage instantly.
Motor FLA Calculator
Calculate full load amperes for single-phase and three-phase AC motors.
PWM Duty Cycle Calculator
Instantly compute duty cycle, frequency, t-on, t-off, period, average voltage, RMS voltage, and power for any PWM signal.
Automotive
Boiler Horsepower & Steam Output Calculator
Convert boiler horsepower to BTU/h, kW, and lbs/hr of steam, plus reverse from kW
G-Code Speed & Feedrate Calculator
Convert mm/s print speeds to G-code feedrate (mm/min) values
Hunting Wind Chill & Effective Temperature Calculator
Calculate wind chill and the clothing layers you need to hunt in the cold
Motor Horsepower to kW Converter
Convert mechanical, metric, and electrical horsepower to kW, plus shaft torque
Refrigeration System Compression Ratio Calculator
Calculate compression ratio from suction and discharge pressures to diagnose compressor health
Automotive Gear Ratio & Speed Calculator
Calculate vehicle speed from RPM, gear ratio, final drive, and tire size
Gear Ratio & Speed Calculator
Compute output RPM, torque ratio, and speed from gear tooth counts
Lathe Turning Horsepower Calculator
Estimate required lathe HP for a turning pass from depth of cut, feed, and material
Milling Horsepower Calculator
Estimate spindle power required for a face-milling or end-milling cut
Plasma Cut Speed Calculator
Find optimal plasma cut speed (IPM) for any steel thickness and amperage
True Airspeed (TAS) Calculator
Calculate true airspeed from indicated airspeed, altitude, and temperature
MIG Wire Feed Speed Calculator
Calculate deposition rate and wire-feed speed from amperage and wire diameter
Engineering Notation Converter
Express numbers in engineering notation (exponents of 3)
FIRE Retirement Calculator
Find your FIRE number and how long until you reach it.
Horsepower to Watts Converter
Convert mechanical horsepower to watts and back, instantly.
Retirement & FIRE Planner
Project your portfolio to retirement, find your FIRE number, and see if it lasts.
Retirement Countdown
Live countdown to the day you reach your target retirement age.
RC Gear Ratio Calculator
Calculate pinion, spur and top speed for your RC car build.
Ackermann Angle Calculator
Calculate ideal inner and outer steer angles, turning radius and Ackermann percentage for any vehicle geometry.
Air-Fuel Ratio Calculator
Calculate AFR, lambda, and equivalence ratio for any fuel — gasoline, diesel, ethanol, methanol, hydrogen and more.
Brake Horsepower Calculator
Calculate BHP from torque and RPM, a Prony brake, or BMEP — with full step-by-step working.
Compression Ratio Calculator
Calculate engine compression ratio — or solve for bore, stroke, or clearance volume.
Engine CC to HP Calculator
Convert engine displacement to horsepower using four engineering methods.
Engine Displacement Calculator
Calculate engine displacement, bore, stroke or cylinder count from any three variables.
Final Drive Ratio Calculator
Solve ring/pinion ratios, vehicle speed, engine RPM and tyre size in one tool.
Fuel Injector Size Calculator
Find the right injector size for your target horsepower in seconds.
Horsepower to Torque Calculator
Convert between horsepower, torque and RPM with full step-by-step working.
Intercooler Calculator
Calculate charge-air temperature drop, pressure loss, density gain and estimated power increase from your intercooler.
Quarter-Mile Calculator
Predict your drag-strip ET and trap speed from horsepower and weight.
Tire Diameter Calculator
Find overall diameter, sidewall, circumference and revs/mile — plus speedometer correction when swapping sizes.
Tire Size Calculator
Decode any P-metric tire code and compare two sizes in seconds.
Turbo Size Calculator
Find the right turbocharger for your engine — compressor flow, pressure ratio, inducer size and shaft speed.
Wheel Offset Calculator
Calculate backspacing, lip clearance and track change from ET offset.
0-60 mph Estimator
Estimate your car''s 0–60 mph time from weight and horsepower.
Boost Pressure Calculator
Convert boost gauge readings, solve pressure ratio, model charge-air density and check injector duty cycle — all in your browser.
Gear Ratio & Speed Calculator
Work out vehicle speed, RPM, gear ratios and final drive from tyre size and transmission data.
Speedometer Error Calculator
Find out how inaccurate your speedo really is — and what your true speed is.
Volumetric Efficiency Calculator
Measure how well your engine breathes — four methods, instant results.
Music & Audio
BPM to Delay Time (ms) Calculator
Find the perfect delay time in milliseconds for any BPM and note value
BPM to Reverb Pre-Delay Calculator
Sync reverb pre-delay to tempo for rhythmically coherent wet sounds
Capo Chord Transposer
Find real chord names when using a capo at any fret position.
Chord Interval Finder
Identify the intervals and inversions present in any chord voicing
Compressor Attack & Release to BPM Calculator
Set musically synced compressor attack and release times from BPM
Guitar Fret Spacing Calculator
Calculate fret positions for any scale length using the rule of 18
Metronome Math Calculator
Turn BPM and a bar count into exact beat, bar and total durations.
Sample Chop BPM Grid Calculator
Find where to cut a sample loop to keep it in time at any BPM
Scale & Chord Builder
Generate the note list for any scale or chord in any root key.
Semitone & Cents Interval Calculator
Calculate frequency ratios, semitones, and cents between two pitches
Song Key Transposer
Transpose chord charts and key signatures up or down any number of semitones
Speaker Impedance Calculator
Work out the total load for any series or parallel speaker wiring.
Guitar String Tension Calculator
Calculate string tension for any gauge, scale length, and tuning.
Ported Subwoofer Box Volume & Port Calculator
Design a ported/bass-reflex subwoofer enclosure with a tuned port
Tap Tempo BPM Calculator
Tap a button to measure BPM and get delay times instantly
Tempo-to-Note-Grid Reference Table
Full table of note subdivision durations in ms for any BPM
Time Signature Note Value Converter
Find the exact duration of every note value at any tempo and meter.
BPM to Milliseconds Calculator
Turn any tempo into delay and note-length times in milliseconds.
Note Frequency Calculator
Find the exact frequency in Hz for any musical note and octave.
Speaker Box Volume Calculator
Design sealed and ported enclosures using Thiele-Small parameters.
Speaker Impedance Calculator
Calculate total impedance for series, parallel and mixed speaker wiring in seconds.
Subwoofer Port Length Calculator
Calculate the exact port tube length to hit your target bass tuning frequency.
BPM to Milliseconds Calculator
Convert any tempo to exact delay, echo and reverb times — straight, dotted and triplet.
Capo Transpose Calculator
Find the right capo fret and open chord shape for any key — instantly.
Cents to Frequency Calculator
Convert pitch intervals in cents to exact frequencies — and back.
Chord Finder
Build any chord by root and type, or identify a chord from its notes — with audio playback.
Guitar String Tension Calculator
Find the exact tension on every string — or the right gauge for a target feel.
Key Transpose Calculator
Transpose any song to a new key instantly — diatonic chords, scale notes and full chord charts.
Semitone Interval Calculator
Pick any two notes and instantly see the semitone distance, cents, frequency ratio and interval name.
Time Signature Calculator
Beat durations, bar lengths, compound vs simple meters, polyrhythm grids and tap tempo — all in one tool.
BPM Delay Calculator
Convert BPM to delay times, reverse-engineer tempo from a known delay, tap-detect tempo and model feedback decay — all in one tool.
Metronome & BPM Tapper
Tap the beat, measure your tempo, and hear a precise click-track with note-delay tables.
Scale Degree Calculator
Instantly see every note, Roman numeral and interval in any musical scale.
Gaming
Catan Dice Roll Probability Analyzer
Find the best Catan settlements by dice probability
Dice Tower & Anydice Probability Calculator
Compute probabilities for exploding dice, drop-lowest, and pool systems
D&D Advantage/Disadvantage Calculator
How much does advantage actually help your D&D rolls?
D&D 5e Race & Subrace Trait Reference
Look up racial traits, speeds, and darkvision for any D&D 5e race
D&D Multiclass Proficiency & Spell Slot Tracker
Get proficiency bonus and combined spell slots for multiclass builds
D&D Custom Monster CR Builder
Calculate challenge rating for a custom D&D 5e monster
D&D Damage Per Round (DPR) Calculator
Calculate average DPR for any D&D 5e attack or spell
D&D Dice Probability Calculator
Exact probabilities for any D&D dice roll combination
D&D Encounter CR / XP Budget Calculator
Balance D&D 5e encounters by the book using XP thresholds
D&D Hit Points Calculator
Max and average HP for any D&D 5e character build
D&D Initiative Tracker
Track initiative order and HP for any D&D encounter
D&D Treasure / Loot Generator
Generate hoard or individual treasure by CR using DMG tables
D&D 5e Point Buy Calculator
Allocate ability scores with the D&D 5e point-buy system
D&D Proficiency Bonus & Skill Check Calculator
Calculate all skill and saving throw bonuses for any D&D character
D&D Wild Magic Surge Probability Calculator
Track and calculate Wild Magic Surge odds for sorcerers
D&D XP to Next Level Tracker
Track XP and milestone progression for any D&D 5e character
MTG Draft Pick Evaluation Tool
Rank your MTG draft picks by power, color commitment, and curve
MTG Combo Turn Estimator
Estimate the average turn you'll assemble a 2- or 3-card combo
MTG Deck Archetype Analyzer
Classify your MTG deck as aggro, midrange, control, or combo
MTG Commander Color Identity Checker
Verify card color identity legality for any EDH Commander deck
MTG Hypergeometric Draw Calculator
Probability of drawing any card combination from your MTG deck
MTG Land Count Optimizer
Find the optimal land count for your Magic deck
MTG Mana Curve Analyzer
Visualize and optimize your Magic: The Gathering mana curve
MTG Mulligan Probability Calculator
Odds of hitting your opening hand requirements in Magic
MTG Infect / Poison Counter Tracker
Track infect damage and poison counters in Magic: The Gathering
MTG Storm Count Calculator
Track your storm count and the copies a Storm spell will make
Custom Dice Pool Probability Table
Calculate the full probability distribution for any dice pool
Red Cell Indices (MCV, MCH, MCHC) Calculator
Compute erythrocyte indices from a CBC to classify anaemia
Neonatal Jaundice Phototherapy Threshold Calculator
Plot total serum bilirubin against gestational-age thresholds
Renal Stone Risk Index Calculator
Urinary supersaturation indices for calcium oxalate and uric acid
Italy Codice Fiscale Decoder & Validator
Decode an Italian Codice Fiscale — date of birth, gender and check digit.
Dice Notation Roller
Roll full RPG dice notation: 3d6+2, 2d20kh1, 4d6dl1, exploding dice and more.
D&D Ability Score Calculator
Roll, buy, or array-assign your D&D 5e stats with modifiers, saving throws and XP thresholds.
Character Level Calculator
Instantly find your RPG character level from XP — D&D 5e, Pathfinder 2e and OSE.
Damage Per Second (DPS) Calculator
Calculate true DPS for any weapon, build or ability rotation in any game.
D&D 5e Encounter XP Calculator
Balance encounters by difficulty — Easy, Medium, Hard or Deadly.
D&D Spell Slot Tracker
Track every spell slot for every D&D 5e caster class in real time.
Experience Points (XP) Calculator
Build D&D 5e encounters, look up level-up thresholds and track character XP — all in one tool.
Loot Roll Generator
Simulate RPG loot tables with weighted drops, rarity tiers, and dice quantities.
MTG Life Counter
Track life totals, poison counters, commander damage and more for Magic - The Gathering.
D&D Critical Hit Calculator
Instantly see crit damage range, average, and full probability distribution.
Dice Probability Calculator
Exact probabilities for any dice roll — 2d6, 3d10, custom polyhedral dice.
Astronomy
Lunar Phase & Moonlight Exposure Calculator
Estimate the EV of moonlight and get shutter, aperture, and ISO for moonlit scenes.
Moon Phase & Illumination Calculator
Calculate moon phase, illumination %, and lunar age for any date
Astrophoto Golden Hour & Astronomical Twilight Calculator
Calculate civil, nautical, and astronomical twilight times for imaging
Sunrise/Sunset Azimuth Angle Calculator
Find the compass direction the sun rises and sets for any date and location.
Telescope Resolving Power & Aperture Guide
Calculate Dawes limit and Rayleigh limit for any telescope aperture
Barlow Lens Effective Focal Length Calculator
Calculate new magnification and focal length with a Barlow lens
Telescope Focal Ratio (f/ratio) Calculator
Calculate focal ratio, speed, and depth of focus for any scope
Telescope Eyepiece Magnification Calculator
Calculate magnification, exit pupil, and true FOV for any eyepiece
Moon Phase Calculator
Find the moon phase and illumination for any date.
Astronomical Unit Converter
Convert astronomical units (AU) to kilometers and back.
Light-Years to Kilometers Converter
Convert light-years to kilometers and back.
Parsecs to Light-Years Converter
Convert parsecs to light-years and back.
Planet Weight Calculator
See how much you would weigh on every planet, the Moon and the Sun.
Telescope Magnification Calculator
Find your telescope magnification from focal length and eyepiece.
Sunrise & Sunset Calculator
Find exact sunrise, solar noon, and sunset times for any location and date.
Golden Hour Calculator
Find the exact golden hour and blue hour windows for any location and date.
Blue Hour Calculator
Find exact blue hour, golden hour and twilight times for any location and date.
Next Full Moon Calculator
Find the exact date and time of the next full moon — and the ones after it.
Sunrise & Sunset Time Calculator
Find exact sunrise, sunset, solar noon and golden hour for any location and date — no internet needed.
Telescope Magnification Calculator
Magnification, exit pupil, true FOV, limiting magnitude and resolving power — all in one tool.
Angular Resolution Calculator
Rayleigh criterion, Dawes limit, Abbe limit, pixel scale and more — all in your browser.
Day Length Calculator
Sunrise, sunset, golden hour and day length for any location and date — no internet required.
Focal Ratio Calculator (f-number / f-stop)
Calculate f-number, focal length, aperture diameter, depth of field and exposure equivalents.
Light-Year Distance Calculator
Convert cosmic distances between light-years, parsecs, AU, km and more — with light travel time.
Moon Phase Tonight
See the current moon phase, illumination, distance and next phase dates — instantly.
Redshift Calculator
Compute cosmological distances, lookback time and recession velocity from redshift z.
Solar Noon Calculator
Find the exact moment the sun peaks in the sky — plus sunrise, sunset and golden hour.
Star Magnitude Calculator
Compare star brightness, find absolute magnitude, and compute telescope limits.
Geography & GPS
Bolt Circle Coordinate Calculator
Calculate XY coordinates for equally spaced bolt-circle holes
Compass Deviation & Variation Correction Tool
Convert true, magnetic, and compass bearings using the TVMDC method
Great-Circle Aviation Route Calculator
Calculate great-circle distance, initial track, and waypoints between airports
Nautical Distance Calculator (Rhumb & Great-Circle)
Calculate sea distance between two ports by rhumb-line and great-circle methods
3D Distance Calculator
Find the straight-line distance between two points in three-dimensional space.
Haversine Distance Calculator
Calculate the great-circle distance between any two points on Earth.
Latitude & Longitude Converter
Convert coordinates between DD, DDM, DMS, radians and UTM — plus great-circle distance and bearing.
Bearing Calculator
Find the compass bearing and great-circle distance between any two points on Earth.
Compass Bearing Calculator
Find the true bearing and great-circle distance between any two points on Earth.
Coordinate Distance Calculator
Great-circle distance, bearing and midpoint between two GPS coordinates.
GPS Coordinate Formatter
Convert GPS coordinates between DD, DDM, DMS, UTM, Geohash, Plus Code, Maidenhead and MGRS instantly.
Great-Circle Distance Calculator
Compute the shortest path between any two points on Earth — with bearings, midpoint, and Vincenty precision.
Map Scale Calculator
Convert map distances to real-world distances — and find any unknown in the scale equation.
UTM Coordinate Converter
Convert between UTM grid references and latitude/longitude in both directions.
Statistics & Probability
Lorcana Deck Draw Probability Calculator
Probability of drawing Lorcana cards in your opening hand
Motor KV & Propeller Combination Calculator
Match motor KV rating to the right propeller for your RC build
Pokémon TCG Draw Probability Calculator
Hypergeometric odds for Pokémon card draws and combos
Pokémon Prize Card Probability
Odds your key cards are prized in a Pokémon game
Yu-Gi-Oh! Combo Probability Calculator
Hypergeometric odds for Yu-Gi-Oh opening hands and combos
Combinations & Permutations Calculator
Compute nCr, nPr, and factorials instantly in your browser.
Z-Score Calculator
Convert a value to a standard score — and back.
Confidence Interval Calculator
Mean ± margin of error at 80–99% confidence.
Correlation Calculator
Pearson r for two paired data series.
Probability Calculator
Complement, AND/OR for independent events, and Bayes.
Sample Size Calculator
How many responses you need for a survey.
Statistics Calculator
Paste numbers and get mean, median, mode, range, variance, standard deviation, quartiles and sum instantly.
Standard Deviation Calculator
Sample and population standard deviation with a full step-by-step working table.
Permutation and Combination Calculator
Compute nPr and nCr with a full factorial breakdown and exact big-number math.
Expected Value Calculator
Calculate E[X] for discrete, Bernoulli, uniform and normal distributions — with full working shown.
Kelly Criterion Calculator
Find the mathematically optimal bet size to maximise long-run bankroll growth.
Linear Regression Calculator
Fit a least-squares line, get R², ANOVA table, residuals and predictions instantly.
P-Value Calculator
Instantly compute exact p-values for Z, t, and chi-squared tests — with formula working shown.
Poisson Distribution Calculator
Calculate exact, cumulative and range probabilities for any Poisson process.
Binomial Probability Calculator
Exact P(X = k), cumulative CDF and full distribution — with a bar chart.
Combinations with Repetition Calculator
Count multiset selections using the stars-and-bars formula.
Correlation Coefficient Calculator
Calculate Pearson r, R², regression line and scatter plot instantly.
Z-Score to Percentile Calculator
Convert any z-score to a percentile — or find the z-score for any percentile.
Birthday Paradox Calculator
Discover how quickly shared birthdays become probable in a group.
Geometry
CO2 Cylinder Duration Calculator
Estimate how long a CO2 cylinder will last in your planted tank
Bokeh Circle of Confusion Size Calculator
Calculate the physical diameter of bokeh discs at any aperture and distance
Shell Thickness & Perimeter Calculator
Calculate total shell thickness from perimeter count and line width
Circle of Fifths Key Relationship Tool
Find relative and parallel keys, borrowed chords, and modulation paths
Circle of Confusion Calculator
Find the right circle of confusion for your sensor and viewing setup
Lightning Protection Rolling Sphere Calculator
Determine air terminal zones of protection per the NFPA 780 rolling sphere method.
Refrigerant Recovery Cylinder Capacity Calculator
Check recovery cylinder remaining capacity without exceeding the 80% fill limit
Circle Calculator
Radius, diameter, circumference and area from any one value.
Triangle Calculator
Area, perimeter and angles from three side lengths.
Pythagorean Theorem Calculator
Solve a² + b² = c² for the hypotenuse or a missing leg.
Body Surface Area Calculator
BSA in m² by Du Bois, Mosteller and Haycock formulas.
Sphere Calculator
Volume and surface area of a sphere from its radius.
Cone Calculator
Volume, surface area and slant height of a right circular cone.
Cylinder Calculator
Volume and surface area of a right circular cylinder.
Pyramid Calculator
Volume and surface area of a rectangular-base pyramid.
Trapezoid Calculator
Area, perimeter and midsegment of a trapezoid.
Ellipse Calculator
Area, perimeter, eccentricity and axes of an ellipse.
Polygon Area Calculator
Area, perimeter and angles of any regular polygon.
Hexagon Calculator
Area, perimeter, diagonals and apothem of a regular hexagon.
Sector & Arc Calculator
Arc length, sector area and chord from radius and angle.
Parallelogram Calculator
Area, height, perimeter and diagonals of a parallelogram.
Right Triangle Trig Solver
Solve any right triangle from two known values — sides and angles.
Law of Cosines Calculator
Solve any triangle from three sides or two sides and an angle.
Pentagon Calculator
Area, perimeter, diagonal and radii of a regular pentagon.
Octagon Calculator
Area, perimeter, diagonals and radii of a regular octagon.
Rhombus Calculator
Area, perimeter, diagonals and angles of a rhombus.
Regular Polygon Calculator
Area, perimeter, radii and angles for any regular n-gon.
Annulus Calculator
Area, width and circumferences of a ring between two circles.
Ramp Slope Calculator
Angle, percent grade, rise/run ratio and ADA compliance — instantly.
Rise Over Run Calculator
Slope, angle, grade and pitch from any rise and run — or solve in reverse.
Cube Volume Calculator
Instantly find the volume, surface area and diagonals of any cube — solve from any known value.
Ellipsoid Volume Calculator
Compute volume, surface area and solve for any semi-axis — all in your browser.
Equilateral Triangle Calculator
Instantly find side, height, area, perimeter, inradius and circumradius — solve from any one value.
Pyramid Volume Calculator
Volume, surface area and slant height for any pyramid — square, rectangular, triangular or hexagonal base.
Rectangular Prism Volume Calculator
Instantly find volume, surface area and space diagonal — or solve for any missing dimension.
Right Triangle Calculator
Solve any right triangle from two known values — sides, angles, area and trig ratios instantly.
Slope-Intercept Calculator
Find the equation y = mx + b from two points, solve for x or y, and see the diagram.
Sphere Volume Calculator
Instantly find volume, surface area, diameter or radius — solve for any variable.
Triangle Area Calculator
Find the area of any triangle: base-height, Heron's formula, SAS, or coordinates.
Hexagon Area Calculator
Find the area of a regular hexagon from any measurement you have.
Circle Diameter Calculator
Find diameter, radius, circumference and area — solve from any one value.
Cone Volume Calculator
Calculate cone volume — or solve for radius or height from a known volume.
Rhombus Area Calculator
Find rhombus area from diagonals, side + height, or side + angle — with full working.
Torus Volume Calculator
Find volume, surface area and all torus dimensions — solve for any variable.
Trapezoid Area Calculator
Instantly find the area of any trapezoid — or solve for any missing dimension.
Triangle Angle Calculator
Find every angle and side of any triangle from three known values.
Annulus Area Calculator
Find the ring area, or solve for outer or inner radius from a known area.
Arc Length Calculator
Find arc length, radius or central angle — with working steps and a live diagram.
Capsule Volume Calculator
Calculate capsule volume — or solve for radius or cylinder height from a known volume.
Circle Area Calculator
Area, radius, diameter and circumference — solve for any one from any other.
Circle Equation Calculator
Find the standard form, general form, area, arc length, chord and sector — instantly.
Cylinder Volume Calculator
Find volume, surface area or a missing dimension of any cylinder instantly.
Ellipse Area Calculator
Compute ellipse area, perimeter, eccentricity — or solve for any missing semi-axis.
Frustum Volume Calculator
Find the volume of a truncated cone — or solve back for height or radius.
Hemisphere Volume Calculator
Calculate the volume, curved surface area and base area of any hemisphere instantly.
Heron's Formula Calculator
Find the area of any triangle from its three side lengths — no angles needed.
Law of Sines Calculator
Solve any triangle from two angles + one side, or two sides + an opposite angle.
Octagon Area Calculator
Area, perimeter, diagonals and radii of a regular octagon — solved from any measurement.
Parallelogram Area Calculator
Find the area of any parallelogram — or solve for base or height — instantly.
Regular Polygon Area Calculator
Area, perimeter, radii and angles for any regular n-gon — solve from side, radius or perimeter.
Sector Area Calculator
Area, arc length, chord and perimeter from any two of: radius, angle, or area.
Tetrahedron Volume Calculator
Calculate the volume of a regular tetrahedron — or find the edge length from a known volume.
Triangular Prism Volume Calculator
Find the volume (and surface area) of any triangular prism instantly.
Circle Circumference Calculator
Circumference from radius, diameter or area — solve any way around.
Pentagon Area Calculator
Area, perimeter, inradius, circumradius and diagonal — solve from any measurement.
Sphere Surface Area Calculator
Find the surface area of any sphere — or back-calculate the radius from a known area.
Diagonal of a Rectangle Calculator
Find the diagonal, width, height, angles, area and perimeter — with full step-by-step working.
Law of Cosines Solver
Solve any triangle from any three pieces — all five congruence cases with full step-by-step working.
Perimeter Calculator
Instantly find the perimeter of 14 shapes with step-by-step working.
Surface Area Calculator
Instant surface area for 10 shapes — sphere, cylinder, cone, prism, pyramid, torus and more.
Unit Circle Calculator
Enter any angle and instantly read sin, cos, tan, csc, sec, cot — with a live diagram.
Math & Algebra
Tape Machine Operating Level Calculator
Convert between nWb/m tape flux levels and VU/dB reference levels
Aquarium Evaporation & ATO Top-Off Calculator
Estimate daily evaporation and size your ATO reservoir
Water-to-Grain Ratio (Quarts per Pound) Calculator
Find the optimal mash thickness for your recipe and equipment
Bittering to Aroma Hop Ratio Calculator
Balance bittering, flavor, and aroma hop additions by IBU contribution
BU:GU Ratio Calculator
Check balance between bitterness units and gravity units in your recipe
dB to Power Ratio Converter
Convert decibel values to power ratios using the 10·log10 formula.
E-Steps Calibration Calculator
Calculate new extruder steps-per-mm value from a calibration measurement
Gravity to Degrees Balling Converter
Convert specific gravity readings to the Balling sugar scale
Equipment Grounding Conductor Sizing (NEC 250.122)
Select minimum EGC wire size from the NEC 250.122 table by OCPD rating
Lager Lagering Duration Calculator
Calculate minimum lagering time at temperature for clean lager production
Photo Aspect Ratio & Crop Calculator
Find crop dimensions and lost pixels for any target aspect ratio
Bellows Draw Magnification Ratio Table
Generate a magnification table for all bellows extension lengths
Shutter Speed Fraction to Decimal Converter
Convert fractional shutter speeds to decimal seconds and find the EV gap between two speeds.
Polar Alignment Drift Rate Calculator
Calculate polar alignment error from measured drift rate
Polyrhythm & LCM Calculator
Find the cycle length and grid resolution for any polyrhythm.
Sensor Aspect Ratio to Print Size Matcher
Find standard print sizes that match your camera's native aspect ratio with the least cropping.
RC Drone Thrust-to-Weight Ratio Calculator
Calculate thrust-to-weight ratio for any multirotor or fixed-wing
Resin & Epoxy Mixing Ratio Calculator
Calculate part A and part B volumes for any epoxy by mix ratio
Sample Rate Conversion Ratio Calculator
Get the resampling ratio and output sample count between two rates.
Soap Recipe Oil Percentage Calculator
Balance soap oil percentages for lather, hardness, and longevity
Sulfate to Chloride Ratio Calculator
Balance SO4:Cl ratio for hoppy vs malty beer water profiles
TCG Card Pop Report & Market Math Calculator
Analyze PSA/BGS pop report data and grade distribution math
Wort Boil Concentration Factor
Calculate how much gravity increases as wort boils down
XY Steps-Per-mm Calibration Calculator
Correct X/Y axis steps-per-mm from measured vs requested movement.
Phenytoin Free Fraction Estimator in Renal Failure
Estimate unbound phenytoin when both albumin and GFR are low
Sine Bar / Sine Plate Setup Calculator
Calculate gauge-block stack height for a sine bar at any angle
MBEC / MBIC Ratio Calculator for Biofilm Studies
Compute biofilm eradication and inhibition ratios versus MIC
Carbon Price Impact on Business Cost Calculator
Model how EU ETS or UK ETS carbon price changes affect operating costs
CBM (Cubic Metre) Cargo Calculator
Calculate total cubic metres for ocean, air, or road freight shipments
Compost Recipe C:N Ratio Calculator
Balance carbon and nitrogen inputs in a compost pile using the C:N ratio
Concrete Mix Ratio Calculator
Compute cement, sand, gravel, and water quantities for any mix design
Crop Water Use (ET) Estimator
Estimate daily and seasonal evapotranspiration for major field crops
DeFi Collateral Ratio & Health Factor Calculator
Calculate collateral ratio and health factor for lending protocols like Aave
Pharmacy Dose Rounding Calculator
Round calculated doses to the nearest available tablet or vial strength
ELISA Standard Curve & Sample Concentration Calculator
Fit a 4PL curve and interpolate ELISA sample concentrations
ESG Double Materiality Matrix Builder
Map ESG topics by financial and impact materiality for CSRD reporting
Ether Unit & Scientific Notation Converter
Convert ETH values between ether, gwei, wei, and scientific notation
Feed Conversion Ratio (FCR) Calculator
Calculate feed conversion ratio, feed cost per kg gain, and breakeven feed price
Livestock Feed Ration Calculator
Balance a basic ruminant ration for protein, energy, and dry matter
Fractional Excretion of Sodium (FENa) Calculator
Distinguish pre-renal AKI from intrinsic renal failure
P/F Ratio (PaO₂/FiO₂) Calculator — Berlin ARDS Criteria
Calculate the oxygenation index and ARDS severity classification
Flow Cytometry Compensation Matrix Calculator
Calculate spectral spillover correction from single-stain controls
HbA1c to Average Glucose Converter (eAG)
Convert HbA1c (% or mmol/mol) to estimated average glucose
Health & Safety Risk Matrix Calculator
Calculate a risk rating from likelihood × severity on a 5×5 or 3×3 matrix
UK ICO Data Protection Registration Checker
Check if you must register with the UK ICO and estimate your data protection fee tier
Immigration Priority Date Tracker
Check whether your priority date is current against the visa bulletin
Infusion Concentration & Rate Calculator
Convert drug mass/volume to mcg/kg/min or mg/hr infusion rates
INR from PT Ratio & ISI Calculator
Convert prothrombin time and reagent ISI to a standardised INR
MAC (Minimum Alveolar Concentration) Calculator
Age-adjusted MAC for volatile anaesthetic agents
Crypto Wallet Age & HODL Duration Calculator
Calculate HODL duration and ROI from any manually-entered acquisition date
Oxygen Saturation Altitude Correction Calculator
Adjust expected SpO2 and PaO2 ranges for altitude
Percent Solution Calculator (w/v, w/w, v/v)
Calculate w/v, w/w, or v/v percentage concentrations
Perioperative Fasting Duration Calculator
Calculate safe pre-op fasting end-times from scheduled surgery time
Primer Tm (Melting Temperature) Calculator
Estimate primer melting temperature by nearest-neighbour or basic method
Chemical Reaction Theoretical & Percent Yield Calculator
Calculate theoretical yield and reaction efficiency from stoichiometry
Scope 3 Business Travel Emissions Calculator
Calculate Scope 3 Category 6 business travel CO2e across all transport modes.
Soil Cation Exchange Capacity & Base Saturation Tool
Calculate CEC, base saturation, and lime requirement from soil test results
Spirometry % Predicted Calculator (GLI-2012)
Classify FEV1, FVC, and FEV1/FVC against reference values
Sprayer Calibration Calculator
Calibrate sprayer output in GPA from nozzle flow, speed, and row spacing
Weld Joint Preparation Calculator
Calculate groove angle, root face, and root opening for AWS-standard joints
Multi-Pass Weld Sequence Planner
Calculate passes, pass size, and a distortion-control sequence for any groove
Western Blot Sample Preparation Calculator
Normalise protein samples to equal loading mass for SDS-PAGE
Date Add/Subtract Duration
Add or subtract days/months/years to/from a given date
Collatz Sequence Generator
Generate the Collatz (3n+1) sequence for any starting integer
Continued Fraction Converter
Express any real number as a continued fraction expansion
Detroit Cost-of-Living Index — 80 vs US Average of 100
Compare Detroit living costs (composite index 80) to the US national average across housing, food, and more.
Duration Humanizer
Convert a number of seconds into a 2 hours, 34 minutes form
Fibonacci Sequence Generator
Generate the first N terms of the Fibonacci sequence
Float to Rational Fraction Converter
Find the simplest rational fraction approximating a decimal
Los Angeles Cost-of-Living Index — LA vs US Average
Compare Los Angeles living costs (index 173) to the US national average of 100.
Modular Exponentiation Calculator
Compute (base^exp) mod m efficiently using fast exponentiation
Ratio Simplifier
Reduce a ratio like 24:36 to its simplest form
Extended Roman Numeral Converter
Convert numbers beyond 3999 using extended Roman numerals with vinculum overbars.
Fraction to Decimal Converter
Turn any fraction — proper, improper or mixed — into a decimal.
Decimal to Fraction Converter
Convert any decimal into its simplest fraction or mixed number.
Mean, Median & Mode Calculator
Get the mean, median, mode, range and sum of any list of numbers.
Quadratic Formula Solver
Solve ax² + bx + c = 0 for real or complex roots.
Percentage Change Calculator
Work out the percentage increase or decrease between two values.
Business Days Calculator
Count working days between two dates, holidays excluded.
CGPA to Percentage Calculator
Convert CGPA to a percentage using CBSE, VTU, or a custom multiplier.
Romania CNP Decoder
Decode birth date, sex and county from a Romanian CNP.
Percentage of a Number Calculator
Quickly find what a percentage of any number is.
Tip Percentage Table
See the tip and total for a bill across every common tip percentage at once.
Percentage Increase / Decrease Calculator
Find the % change between two numbers, or apply a % rise or fall.
Proportion Solver (Cross-Multiplication)
Solve a/b = c/d for the missing value by cross-multiplication.
Exponent Calculator (Power Calculator)
Raise any base to any power — including negative and fractional exponents.
Logarithm Calculator (log, ln, log₂, any base)
Compute log base 10, natural log, log base 2 or any custom base.
Factorial Calculator (n!)
Compute exact factorials of any non-negative integer with BigInt.
Time Duration Adder
Add and subtract hours, minutes and seconds across a list of durations.
2x2 Matrix Calculator
Add, subtract, multiply, and find the determinant or inverse of 2x2 matrices.
Prime Factorization Calculator
Break any whole number down into its prime factors instantly.
Percentage of Total Calculator
Turn a list of values into each value's share of the total.
Cubic Meters to Liters Converter
Convert m³ to liters (and back) instantly.
Acceleration Calculator
a = (v_f − v_i) ÷ t — solve for acceleration, velocity, or time.
Percentile Calculator
Find any percentile of a data set — or a value's rank.
Degrees to Radians Converter
Convert degrees to radians instantly — rad = ° × π ÷ 180. Free, browser-only.
Radians to Degrees Converter
Convert radians to degrees instantly — ° = rad × 180 ÷ π. Free, browser-only.
Percentage Difference Calculator
Find the percentage difference between two values.
Weighted Average Calculator
Average values that carry different weights.
Rounding Calculator
Round numbers to decimals, multiples or whole numbers.
Add Business Days
Add or subtract business days from a date, skipping weekends.
2D Vector Calculator
Add, subtract, dot, cross and find the angle between 2D vectors.
Complex Number Calculator
Add, subtract, multiply and divide complex numbers with modulus and argument.
Set Operations Calculator
Union, intersection, difference and symmetric difference of two sets.
Modular Exponentiation Calculator
Compute (base ^ exponent) mod modulus for huge numbers.
Percentage to GPA Converter
Convert a percentage grade to a 4.0-scale GPA and letter.
Class Rank Percentile Calculator
Turn your class rank into a percentile and top-percent figure.
Attendance Percentage Calculator
Check your attendance percentage and absences left.
Debt-to-Income Ratio Calculator
See your DTI ratio and where you stand with lenders.
Decision Matrix Maker
Score options against weighted criteria and find the ranked winner.
Date Duration Calculator
Exact years, months, days and hours between two dates — plus add or subtract a duration.
Roman Numeral Math Calculator
Add, subtract, multiply and divide directly in Roman numerals — with a full step-by-step explanation.
Math Worksheet Generator
Build printable arithmetic worksheets with a matching answer key.
Aspect Ratio Crop & Letterbox Calculator
Convert any resolution to a new aspect ratio: crop, letterbox, area kept and storage cost.
Debt-to-Income Ratio Calculator
Add up your monthly debts and income to see your DTI and where it lands with lenders.
GCD & LCM Calculator
Find the greatest common divisor and least common multiple of any integers — with Euclid steps.
Ratio Calculator
Simplify ratios, solve proportions and scale ratios — with the working shown.
Fraction Calculator
Add, subtract, multiply and divide fractions with full working shown.
Percentage Calculator
One tool for every percentage question — of, is-what-%, change, difference, increase, decrease and reverse.
Prime Number Checker
Test any number for primality, factorise it, and list every prime up to N.
Quadratic Equation Solver
Enter a, b, c and get the roots, discriminant, vertex, axis and full working.
Scientific Notation Converter
Convert decimals to scientific, engineering and E-notation with significant figures.
Cold Brew Ratio Calculator
Perfect your coffee-to-water ratio, yield, servings and caffeine estimate.
Compost Ratio Calculator
Find the perfect carbon-to-nitrogen ratio for fast, odour-free composting.
Espresso Ratio Calculator
Dial in the perfect brew ratio, extraction yield and TDS for every shot.
Kombucha Ratio Calculator
Perfect your 1F brew ratios and 2F carbonation sugar — batch-size aware.
Dot Product Calculator
Compute dot products, angles, projections and cross products for 2D–5D vectors.
Matrix Determinant Calculator
Find the determinant of any 2×2 to 6×6 matrix with full step-by-step working.
Modular Exponentiation Calculator
Compute (a^b) mod m instantly — even for enormous cryptographic-size exponents.
Exponential Growth & Decay Calculator
Solve N(t) = N₀·e^(rt) — find future value, initial value, rate, or time.
Matrix Multiplication Calculator
Multiply, invert, transpose or find the determinant of matrices up to 6x6.
Cross Product Calculator (3D Vectors)
Compute a × b instantly — magnitude, angle, area and unit normal.
Vector Magnitude Calculator
Find the length of any 2-D, 3-D or n-D vector, get the unit vector and direction angles.
Cubic Equation Solver
Find all three roots of ax³ + bx² + cx + d = 0 with full working shown.
Decimal to Fraction Calculator
Convert any decimal — including repeating decimals — to its exact simplest fraction, with full step-by-step working.
Big Factorial Calculator — Exact BigInt Up to 10,000!
Compute exact factorials with BigInt, digit counts, scientific notation and full working steps.
Fibonacci Calculator
Find any Fibonacci number instantly, explore the golden ratio, and visualise the spiral.
Fraction to Percent Calculator
Convert any fraction, mixed number, or decimal to a percentage instantly.
Geometric Sequence Calculator
Find any term, the common ratio, or the sum of a geometric sequence instantly.
Greatest Common Factor Calculator
Find the GCF of two or more numbers with full prime-factor working and Euclid steps.
Percent Off Calculator
Find the sale price, saving, or original price for any discount instantly.
Quadratic Formula Calculator
Solve ax² + bx + c = 0 instantly — real and complex roots, full working, parabola diagram.
Simplify Fraction Calculator
Reduce any fraction to its lowest terms instantly, with full working shown.
System of Equations Solver
Solve 2x2 and 3x3 linear systems instantly with full working steps.
Least Common Multiple Calculator
Find the LCM of any list of integers — with prime-factor table, step-by-step working, and a cycle diagram.
Arithmetic Sequence Calculator
Find any term, the sum, or a missing value in an arithmetic sequence.
Cross-Multiplication Calculator
Solve any proportion instantly — enter three values, get the fourth.
Percent Error Calculator
Find the percent error between a measured and accepted value — or solve backwards.
Proportion Calculator
Solve any missing value in a/b = c/d instantly using cross-multiplication.
Summation Calculator
Compute sigma notation sums instantly — custom expressions, arithmetic, geometric, power, and harmonic series.
WACC Calculator
Compute the Weighted Average Cost of Capital with CAPM equity cost and the full tax shield.
Angle Between Vectors Calculator
Find the angle between any two 2-D, 3-D, or 4-D vectors — with full working.
Sine, Cosine & Tangent Calculator
Compute all six trig functions, inverses, unit-circle coordinates and wave graphs instantly.
Cartesian to Polar Calculator
Convert (x, y) to (r, θ) — or reverse — with full working and unit options.
Degrees to Radians Calculator
Convert degrees to radians, see trig values, arc length, sector area and angular motion — all in one tool.
Inverse Trig Calculator
Find angles from ratios — arcsin, arccos, arctan, arccot, arcsec, arccsc and the hyperbolic inverses.
Polar to Cartesian Calculator
Convert polar (r, θ) to Cartesian (x, y) — or reverse — instantly with step-by-step working.
Radians to Degrees Calculator
Convert any angle — see the formula, trig values, DMS and unit-circle coordinates instantly.
Trigonometric Identity Calculator
Verify and evaluate every major trig identity — basic, Pythagorean, double-angle, half-angle, sum-difference, product-to-sum, power-reduction, co-function and inverse.
Brine Ratio Calculator
Find the exact salt-to-water ratio for any brine: pickling, curing, fermentation or food-science.
Coffee-to-Water Ratio Calculator
Get the perfect coffee ratio for any brew method — pour-over, espresso, French press and more.
Ganache Ratio Calculator
Get the exact chocolate-to-cream ratio for truffles, glazes, tarts and more.
Rice Water Ratio Calculator
Perfect rice every time — correct water for any rice type, method and altitude.
Golden Ratio Typography Calculator
Generate a perfect type scale, line heights and measure using φ = 1.618.
Modular Scale Calculator
Generate harmonious type and spacing scales from a base size and musical ratio.
Time Duration Between Two Dates Calculator
Find the exact duration between any two dates — in years, months, days, hours, minutes and seconds.
Food, Cooking & Brewing
Beeswax Food Wrap Recipe Calculator
Calculate beeswax, pine resin, and jojoba oil for food-wrap fabric
Keg Carbonation (CO2) Calculator
Set the correct CO2 regulator pressure for your target carbonation at serving temperature.
Mash Efficiency Calculator
Calculate mash conversion, lauter, and brewhouse efficiency from measured gravity
Wine Potential ABV Calculator
Find potential alcohol from must sugar content in Brix or gravity.
Yeast Pitch Rate Calculator
Calculate the correct amount of yeast to pitch for clean fermentation.
Yeast Starter Calculator
Size a DME starter to reach a target yeast cell count.
Lab Buffer Recipe Generator
Generate gram and molar recipes for Tris, HEPES, PBS, and more
Cooking Measurement Converter
Convert cups, tablespoons, teaspoons, ml and litres for recipes.
Oven Temperature Converter
Convert oven temperatures between °C, °F and gas mark.
Recipe Scaler
Scale a recipe up or down by servings, ingredient by ingredient.
Slow Cooker Time Converter
Convert oven or stovetop times into slow cooker Low and High times.
Yeast Conversion Calculator
Convert between fresh, active dry and instant yeast.
Recipe Cost Calculator
Work out the true cost per serving of any recipe — pack price in, plate cost out.
Cooking Unit Converter
Convert cups, tablespoons, grams and millilitres — density-aware, and scale whole recipes.
Cooking Weight to Volume Converter
Convert grams to cups, tablespoons and teaspoons for any ingredient.
Oven Temperature Converter
Convert between Celsius, Fahrenheit and gas mark with a full reference table.
Beer ABV Calculator
Calculate alcohol by volume, apparent attenuation and calories from OG and FG.
Beer IBU Calculator
Calculate bitterness (IBUs) from hop additions using Tinseth or Rager.
Mash Efficiency Calculator
Know exactly how well your mash converted grain sugars to wort — batch after batch.
Mead ABV Calculator
Find the alcohol content of your mead from original and final gravity readings.
Pizza Dough Calculator
Exact ingredient weights for any number of balls, size, and hydration.
Priming Sugar Calculator
Bottle carbonation sugar amounts for any beer style, volume and temperature.
Wine ABV Calculator
Calculate wine alcohol content from starting and ending specific gravity.
Keg Size Calculator
Convert any keg volume and find out exactly how many pints you will pour.
Meat Curing Calculator
Precise salt, curing salt and sugar amounts for dry or wet cures.
Turkey Cooking Time Calculator
Get the exact cook time, rest time and oven start time for your turkey.
Ham Cooking Time Calculator
Exact oven times for any size ham — bone-in, boneless, fresh or pre-cooked.
Wine Bottles Per Guest Calculator
Find out exactly how many bottles of wine to buy for any event.
Sous Vide Time & Temperature Calculator
Find the exact bath temperature and minimum safe cooking time for any protein.
Butter Conversion Calculator
Convert butter between grams, ounces, cups, sticks, tablespoons and more — with full working shown.
Cooking Temperature Converter
Instantly convert oven temperatures between Celsius, Fahrenheit, Kelvin and UK Gas Mark.
Egg Substitute Calculator
Find the best vegan or allergy-friendly egg replacement for any recipe.
Yeast Conversion Calculator
Convert between active dry, instant, fresh cake, and sourdough starter — instantly.
Slow Cooker Conversion Calculator
Convert any oven or stovetop recipe to slow cooker settings in seconds.
Farming & Garden
Aquarium Alkalinity (KH) & Buffer Calculator
Calculate baking soda or commercial buffer needed to raise KH
Aquarium CO2 Bubble Count Rate Calculator
Convert CO2 bubble count per second to an approximate dosing rate
Aquarium Flow & Turnover Rate Calculator
Calculate filter and powerhead flow needed for your tank turnover
Aquarium Heater Wattage Calculator
Size the right heater wattage for your tank and room temperature
Aquarium Live Rock Amount Calculator
Calculate pounds of live rock needed for a reef tank
Aquarium Nitrogen Cycle Tracker
Log ammonia, nitrite, and nitrate to track new-tank cycling progress
Aquarium Medication Dosing Calculator
Calculate medication dose for your exact aquarium volume
Aquarium Quarantine Tank Protocol Calculator
Calculate medication rotation schedule for a quarantine tank
Planted Tank CO2 Reactor Sizing Calculator
Size a CO2 reactor for your planted aquarium by volume and plant mass
Aquarium Salinity / Specific Gravity Converter
Convert between ppt salinity, specific gravity, and conductivity for reef tanks
Aquarium Stocking Capacity Calculator
Inch-per-gallon and surface-area stocking rules for fish tanks
Aquarium Substrate Amount Calculator
Calculate bags of gravel, sand, or aquasoil for any tank depth
Aquarium Sump Volume & Return Pump Calculator
Size your sump and return pump for any display tank
Aquarium Tank Volume Calculator
Calculate gallons and liters for any tank shape
Aquarium TDS Remineralization Calculator
Dose remineralizer to hit a target TDS for shrimp tanks
Aquarium Water Change % Calculator
Calculate how many water changes reduce a pollutant to your target level
Aquarium Substrate Depth Guide Calculator
Minimum substrate depth for live plants by plant root depth category
Garden Irrigation Deficit Calculator
Calculate supplemental watering needed after measured rainfall
Drip Irrigation Run Time Calculator
Find the run time to deliver your target water volume
Hydroponics Nutrient Solution Calculator
Mix nutrient concentrates to a target EC and ppm for hydro growing
Aquaculture Stocking Density Calculator
Calculate maximum stocking density and feed loading per pond or tank volume
Crop Yield Estimator
Estimate corn, wheat, or soybean yield from ear count, kernel count, and test weight
Fertilizer N-P-K Rate Calculator
Calculate fertilizer product quantity to supply target N, P, and K per acre
Hay Bale Weight Estimator
Estimate hay bale weight from dimensions and species for round, square, and large square bales
Irrigation Run-Time Calculator
Calculate how long to run irrigation to apply a target depth of water
Livestock Gestation Date Calculator
Calculate expected delivery date for cattle, sheep, pigs, horses, and goats
Livestock Stocking Rate Calculator
Calculate carrying capacity in AUEs from pasture area and forage yield
Silage Tonnage Calculator
Estimate fresh and dry-matter tonnes of silage in a clamp, pit, or pile
Livestock Veterinary Drug Dose Calculator
Calculate drug dosage and volume to draw for cattle, sheep, and pig treatments
Grass Seed Calculator
Work out how much lawn seed you need — and what it will cost.
Aquarium Volume Calculator
Find your tank volume in litres, US gallons and UK gallons — five shapes supported.
Garden & Raised-Bed Soil Volume Calculator
Find out exactly how many litres (or bags) of compost or topsoil your raised bed needs.
Plant Spacing Calculator
Find exactly how many plants fit your bed — square or triangular grid.
Hydroponic Nutrient Calculator
Calculate exact salt weights for any reservoir volume and EC target.
Pond Volume Calculator
Calculate pond volume, liner size, pump output, fish stocking and treatment doses.
Fertilizer NPK Calculator
Calculate nutrients delivered, required application rates, and bags needed from any NPK grade.
Seeding Rate Calculator
Calculate the exact kg/ha or lb/acre seeding rate for any crop — and back-calculate population, TSW or establishment.
Chicken Feed Calculator
Daily feed, water, and nutrient needs for any chicken type — layers, broilers, pullets, and more.
Crop Yield Calculator
Calculate yield per hectare or acre from any harvest quantity and field area.
Greenhouse Heating Calculator
Size your greenhouse heater in seconds — fabric loss, infiltration and all.
Irrigation Water Calculator
Calculate gross irrigation requirements, water volumes, and flow rates for any crop and field.
Stocking Density Calculator
Calculate animals per area or biomass per volume — with welfare band assessment.
Hay Bale Calculator
Calculate bale volume, dry matter and how many bales your livestock need.
Livestock Feed Calculator
Calculate daily feed, energy and protein requirements for cattle, sheep, pigs and poultry.
Silage Calculator
Clamp volume, field yield, DM tonnage and feeding days — all in one tool.
Home & DIY
3D Print Total Cost Per Gram
Factor electricity, machine depreciation, and failures into true print cost
3D Print Scale Factor Calculator
Find the scale percentage to resize a model to exact dimensions
3D Print Thread Sizing Chart
Find the correct hole diameter for printed internal threads (ISO, UNC, UNF)
Hot Water Boiler Output & Radiation Calculator
Match boiler net output to connected fin-tube baseboard and cast-iron EDR radiation.
Room BTU Calculator
Size a window AC, mini-split or portable unit for a room with the ENERGY STAR method
Candle Wax & Fragrance Calculator
Calculate wax and fragrance oil amounts for any candle vessel
Crochet Gauge & Stitch Count Calculator
Scale any crochet pattern for your actual gauge
Cross Stitch Fabric Count Calculator
Calculate finished size for any cross stitch pattern on any fabric count
Fabric Shrinkage Calculator
Calculate pre-washed fabric yardage needed accounting for shrinkage
Knitting Increase/Decrease Spacing Calculator
Evenly space increases or decreases over a run of rows or stitches
Knitting Blocking Dimensions Calculator
Calculate wet-blocked dimensions from dry measurements and yarn type
Knitting Gauge Converter & Stitch Calculator
Convert gauge swatches and recalculate stitch counts for any yarn
Knitting Provisional Cast-On Reference
Calculate stitch count and method for any provisional cast-on technique
Knitting Row & Round Counter
Count rows, rounds, and repeats for any knitting project
Knitting Sock Heel Turn Calculator
Calculate short-row heel or flap-and-gusset sock heel math
Lorcana Deck Consistency Score
Score Lorcana deck consistency from ink curve and card mix
Mulch / Bark Volume Calculator
Calculate cubic yards or bags of mulch for any garden area
Quilt Block Size & Fabric Calculator
Calculate finished vs unfinished block sizes and yardage
Radiant Floor Heating BTU Output Calculator
Calculate BTU/h output per square foot from radiant in-floor tubing spacing and water temperature.
Resin Print Support Angle Guide
Determine safe overhang angles without supports for resin SLA/MSLA prints
Soap Lye (Saponification) Calculator
Calculate NaOH or KOH lye amount for any soap oil recipe
Solar Panel Daily/Monthly Output Calculator
Calculate expected kWh output from a PV array by watts, sun hours, and derate.
TCG Deck Building Budget Calculator
Estimate total deck cost from card counts and single prices
Wargame Terrain & Miniature Paint Coverage Calculator
Estimate paint pots needed for any miniature or terrain project
Reptile Terrarium Humidity & Misting Calculator
Calculate misting frequency to hold your target humidity
Yarn Yardage Estimator
Calculate yarn needed for any knitting or crochet project
Brick & Block Count Calculator
Estimate bricks or blocks required for any wall area with mortar joint
Composite Deck Material Calculator
Estimate lineal feet, boards, and fasteners for a composite deck
Concrete Anchor Pullout Strength Calculator
Estimate anchor bolt tensile capacity in concrete using ACI 318 concrete breakout
Concrete Volume Calculator
Calculate concrete volume in cubic yards or cubic metres for slabs, columns, or footings
Deck Joist Span Calculator
Verify allowable joist span for any lumber size, species, and spacing
Drywall Sheet Calculator
Calculate drywall sheets, screws, tape, and mud for any room
Fetal Growth Centile Calculator (INTERGROWTH-21st)
Plot estimated fetal weight against gestational-age centiles
Floor & Wall Tile Calculator
Estimate tile count, thinset bags, and grout for any room with waste factor
Gas Appliance Total BTU/h Load Calculator
Sum gas appliance BTU/h ratings and verify meter and regulator capacity
Gravel & Aggregate Volume Calculator
Calculate cubic yards and tons of gravel, crushed stone, or sand for any area
Home Insulation Payback Calculator
Calculate payback period and CO2 savings for loft or wall insulation
Insulation R-Value Calculator
Calculate total wall or ceiling R-value from multiple insulation layers
Paint Coverage Calculator
Estimate gallons needed for any room based on coverage and coats
Pipe Insulation Heat Loss Calculator
Calculate heat loss per linear foot from bare vs insulated hot water or chilled water pipe.
Proof-of-Work Hash Demo
Interactively mine a block hash with adjustable difficulty in the browser
Roof Pitch & Rafter Length Calculator
Calculate rafter length, ridge height, and board count from span and pitch
Roofing Square & Material Calculator
Turn a roof footprint and pitch into squares, shingle bundles, and ridge cap
Solar Farm Yield Estimator for Agricultural Land
Estimate annual kWh output and agrivoltaic revenue from solar-plus-agriculture installations
PV Panel Mismatch Loss Calculator
Estimate power loss from mixing panels with different Isc or Voc in a string
Stair Stringer Calculator
Calculate rise, run, stringer length, and angle for any stair height
Roof Drain & Stormwater Pipe Sizing Calculator
Size roof drains and leader pipes from roof area and design rainfall intensity per IPC 1106.
Paint Calculator
How much paint to buy for any room — walls, coats and openings.
Tile Calculator
How many tiles to buy for a floor or wall, including waste.
Flooring Calculator
How many packs of laminate, vinyl or wood flooring to buy.
Concrete Calculator
Concrete volume and number of bags for a slab or footing.
Mulch Calculator
How much mulch, bark or compost to cover a garden bed.
Brick Calculator
Estimate how many bricks a wall needs, with a waste allowance.
Gravel Calculator
Work out the volume and weight of gravel for any area.
Fence Calculator
Count the posts, panels and rails for a fence run.
BTU Air Conditioner Calculator
Size an AC unit by working out the BTU your room needs.
Roof Pitch Calculator
Convert between rise/run, angle, percent and x-in-12 pitch.
BTU to kWh Converter
Convert BTU to kilowatt-hours and back, instantly.
Mulch & Soil Calculator
Bed size + depth → cubic yards or metres, bags needed and total cost.
Stairs Calculator
Turn total rise and run into steps, riser height, tread depth and stringer length — with building-code checks.
BTU Calculator
Size heating and cooling: room BTU plus the right air-conditioner.
Wallpaper Calculator
How many rolls of wallpaper you need — pattern repeat and cost included.
Fence and Gate Calculator
Run length, post spacing and gates to posts, panels, rails, concrete and cost.
Roof Area Calculator
Turn a building footprint and roof pitch into actual roof surface area, materials and cost.
Crushed Stone Calculator
Area, depth and material density to tonnes, bags and cost.
Asphalt Calculator
Turn area, depth and mix density into tonnes of asphalt — plus a cost estimate.
Flooring Calculator (Multi-Room, with Cost)
Packs of laminate, hardwood or vinyl across every room — plus cost and waste.
Pool Volume Calculator
Work out your pool volume in litres and gallons, plus chlorine dosing.
Brick Calculator
Wall area + brick size + mortar joint → bricks, mortar bags and cost.
Deck Building Calculator
Turn deck size into a board, joist and screw count — with a cost estimate.
Solar Panel Calculator
Size a solar array from your energy use or roof area — panels, output and savings.
Insulation Calculator
Area + target R-value + pack coverage → packs, rolls and cost.
Carpet Calculator
How much carpet to buy from a fixed-width roll — with waste, stairs and cost.
Drywall Calculator
Sheets of plasterboard, screws, compound and tape — with a cost estimate.
Paint Calculator
Wall area minus doors and windows, coats and coverage, to paint and cost.
3D Print Filament Cost Calculator
Find the exact material cost of any print from grams used and spool price.
3D Print Time & Material Estimator
Estimate print time, filament usage and material cost from model volume, infill and speed.
Board Foot Calculator
Instantly calculate board feet from lumber dimensions and get a material cost estimate.
Crochet Hook Size Converter
Instantly convert crochet hook sizes between US, UK and metric (mm).
Fabric Yardage Calculator
Enter your pattern pieces, pick a bolt width, and get the exact yardage to buy.
Knitting Gauge Calculator
Work out cast-on stitches and rows from your gauge swatch and target size.
Quilt Binding & Backing Calculator
Know exactly how much fabric to buy for binding and backing before you cut a single strip.
Resin 3D Print Cost Calculator
Find the exact material cost of any MSLA or DLP resin print from mL used and bottle price.
Yarn Yardage Calculator
Find exactly how many yards — and skeins — your knitting or crochet project needs.
Candle Wax Calculator
Work out exactly how much wax, fragrance oil and dye you need for any batch.
Epoxy Resin Calculator
Calculate exact Part A and Part B volumes for any mould shape and mix ratio.
Firewood Cord Calculator
Convert stack dimensions to full cords, face cords, BTU and seasonal cost.
Kerf Calculator
Calculate material loss from saw cuts and plan your cut list precisely.
Soap Lye Calculator
Calculate exact NaOH or KOH lye amounts for cold-process and liquid soapmaking.
Wood Shrinkage Calculator
Predict exact dimension loss as lumber dries from green to target moisture content.
Finance & Money
UK Mortgage Calculator
Work out monthly repayments, total interest and overpayment savings.
Compound Interest & Savings Calculator
Project savings growth with regular deposits and compound interest.
Free Invoice Generator
Build a branded invoice with line items, tax and totals, then export a clean PDF.
Loan & Personal Credit Calculator
Monthly payment, total cost of credit and representative APR.
Loan Comparison Tool
Compare up to 3 loans side by side — payment, total interest and a balance chart.
Tip Calculator & Bill Splitter
Split the bill, add a tip, round up and share the result.
Currency Converter
Convert between major currencies with live exchange rates.
Monthly Budget Planner
Track income and expenses, see your savings rate, and get a live spending chart.
Pakistan Salary Income Tax Calculator (FY 2024-25)
Monthly take-home after Pakistan income tax — salaried slabs for FY 2024-25.
Card Grading ROI Calculator
Calculate whether grading a card is worth the submission cost
Currency Banknote Grade Reference Tool
Look up PMG / PCGS paper money grade criteria by numeric grade
Embroidery Floss Length Calculator
Calculate skeins of floss needed for any embroidery or cross-stitch project
Flow Rate & Extrusion Multiplier Calculator
Calibrate extrusion multiplier from measured vs expected filament use
FPV Drone Link Budget Calculator
Estimate FPV video link range from transmitter power and antenna gain
HVAC Economizer Free-Cooling Hours Calculator
Estimate annual free-cooling hours and energy savings from an air-side economizer
LUFS Headroom & Peak Budget Calculator
Find the limiter ceiling needed to hit any streaming LUFS target.
Nigeria Pension Contribution Calculator
Calculate Nigerian Contributory Pension Scheme contributions.
SEER Energy Savings Calculator
Estimate annual cooling-energy savings and payback when upgrading to a higher-SEER air conditioner
Support Tip Diameter & Detachment Force Calculator
Estimate the force needed to remove SLA resin supports by tip diameter
Fly Fishing Tippet & Leader Taper Calculator
Build a custom fly leader with the right taper formula
Bail Bond Premium Calculator
Estimate bail bond premium, collateral, and agent fees from bail amount
Cargo Stowage Factor Calculator
Look up or calculate stowage factors for bulk and general cargo types
CFD & Spread-Bet Margin Requirement Calculator
Calculate CFD or spread-bet margin under ESMA and FCA leverage limits
Contract Liquidated Damages Calculator
Calculate liquidated damages accrued under delay or performance penalty clauses
Crypto Arbitrage Profit Calculator
Calculate arbitrage profit between two exchanges after fees and slippage
Crypto Break-Even Price Calculator
Calculate the price needed to break even after fees and cost basis
Crypto ROI & CAGR Calculator
Calculate return on investment and compound annual growth rate for crypto
Direct Air Capture Break-Even Calculator
Calculate the cost per tonne of CO2 removed via direct air capture at any scale
DeFi Flash Loan Cost Calculator
Calculate Aave or dYdX flash loan fee for a given borrow amount
Energy Efficiency kWh Savings Estimator
Estimate annual kWh and CO2 savings from energy efficiency upgrades
Freight Broker Margin Calculator
Calculate load revenue, carrier cost, gross margin, and net margin per load
Green Bond Framework Alignment Checker
Check a bond's framework against the ICMA Green Bond Principles 2021
Hash Rate Unit Converter & Profitability Context
Convert between H/s, KH/s, MH/s, GH/s, TH/s, PH/s, EH/s
Heat Pump Savings Calculator
Compare heat pump vs gas boiler running cost and CO2 savings
HIV Viral Load Log Reduction Calculator
Convert copies/mL to log₁₀ and assess treatment response
Late Payment Interest Calculator
Calculate statutory or contractual late-payment interest on overdue invoices
Attorney Hourly Rate Break-Even Calculator
Calculate the minimum hourly rate to cover overhead and salary for a solo firm
Post-Judgment Interest Rate Reference
Look up post-judgment interest rates for all 50 US states and federal courts
Crypto Mining Profitability Calculator
Calculate BTC or ETH-equivalent mining profit after electricity costs
MOI (Multiplicity of Infection) Calculator
Calculate virus or phage MOI and Poisson infection fraction
Oxy-Acetylene Tip Size & Pressure Chart
Pick the correct torch tip number and regulator pressures for any thickness
Partnership Profit Allocation Calculator
Allocate profit and loss to partners using guaranteed payments and ratios
Pilot Logbook Hour Tracker & Currency Calculator
Track total flight hours, night, IFR, and landings to check currency requirements
Predicted Peak Expiratory Flow Calculator
Expected PEFR from age, sex, and height using reference equations
Prejudgment Interest Calculator
Compute accrued prejudgment interest from damage date to judgment date
Promissory Note Amortization Calculator
Generate a full amortization schedule for fixed, interest-only, or balloon notes
Security Deposit Interest Calculator
Compute interest owed on residential security deposits under state statutes
Settlement Present Value Calculator
Discount a future lump-sum or structured settlement to today's dollars
Time Charter Operating Expense (TCOE) Calculator
Calculate all-in cost per ship-day from hire, bunkers, port costs, and commission
PV Energy Yield Estimator (Monthly)
Estimate monthly solar production from system kWp and bundled irradiance data
Solar Investment ROI & Cash Flow Calculator
Model 25-year solar cash flows with ITC, SRECs, financing, and rate escalation.
Fire Sprinkler Pipe Sizing Calculator (NFPA 13)
Size branch lines and cross-mains by NFPA 13 pipe-schedule head counts
Crypto Staking APY Calculator
Calculate real staking yield with compounding frequency and token price change
Corticosteroid Equivalence Converter
Convert doses between prednisolone, dexamethasone, hydrocortisone, and more
Structured Settlement Annuity Calculator
Model periodic payments, present value, and implied yield of structured settlements
Sustainability-Linked Loan KPI Calibrator
Calibrate SLL/SLB KPIs against LMA and ICMA ambition thresholds
Thyroid Function Result Interpreter
Classify TSH, free T4, and free T3 results by hypo/hyper pattern
Tree Farm Rotation & NPV Calculator
Calculate net present value of a timber rotation at different cutting ages and discount rates
UK Childcare Voucher & Tax-Free Childcare Calculator
Compare legacy childcare vouchers against Tax-Free Childcare savings
UK Pension Annual Allowance Checker
Check your UK pension annual allowance, tapering and carry-forward
US 401(k) Contribution Limit Calculator
Calculate maximum annual 401(k) contribution including catch-up
US Dependent Care FSA Tax Savings Calculator
Estimate federal, FICA and state tax savings from a dependent care FSA
US Roth IRA Eligibility & Contribution Calculator
Find your reduced Roth IRA limit from the IRS MAGI phase-out
US Schedule C Net Profit Calculator
Calculate sole-proprietor Schedule C net profit and SE tax impact
Albuquerque Comfortable Salary Calculator
Find the salary you need to live comfortably in Albuquerque.
Albuquerque Rent Affordability Calculator
Instantly check if an Albuquerque rental fits your income using local norms.
Atlanta Comfortable Salary Calculator
Find the salary you need to live comfortably in Atlanta.
Atlanta Rent Affordability Calculator
Instantly check if an Atlanta rental fits your income using local norms.
Austin Comfortable Salary Calculator
Find the salary you need to live comfortably in Austin.
Austin Rent Affordability Calculator
Instantly check if an Austin rental fits your income using local norms.
Baltimore Comfortable Salary Calculator
Find the salary you need to live comfortably in Baltimore.
Baltimore Rent Affordability Calculator
Instantly check if a Baltimore rental fits your income using local norms.
Boston Comfortable Salary Calculator
Find the salary you need to live comfortably in Boston
Boston Rent Affordability Calculator
Check if a Boston rental fits your income using local norms
Chicago Comfortable Salary Calculator
Find the salary you need to live comfortably in Chicago using local costs
Chicago Rent Affordability Calculator
Check if a Chicago rental fits your income using the local 30% rule
Currency Minor Unit Converter
Convert between currency major units and smallest minor units using ISO 4217 exponents.
Denver Comfortable Salary Calculator
Find the salary you need to live comfortably in Denver.
Denver Rent Affordability Calculator
Check if a Denver rental fits your income using the local 30% rule
Detroit Comfortable Salary Calculator — 50/30/20 Rule
Find the gross salary you need to live comfortably in Detroit using local rent, transit, and the 50/30/20 budget rule.
Detroit Commute Cost Calculator
Compare the true monthly cost of a Detroit commute — transit vs driving
Detroit Parking Cost Estimator
Estimate daily, monthly, and annual parking costs across Detroit
Detroit Rent Affordability Calculator — 30% Rule & Local Norms
Instantly check if a Detroit rental fits your income using the 30% rule and the local 1-BR median.
Houston Comfortable Salary Calculator
Find the salary you need to live comfortably in Houston.
Houston Rent Affordability Calculator
Check if a Houston rental fits your income using the local 30% rule.
Las Vegas Comfortable Salary Calculator
Find the salary you need to live comfortably in Las Vegas
Las Vegas Rent Affordability Calculator
Instantly check if a Las Vegas rental fits your income using local norms
Los Angeles Comfortable Salary Calculator — 50/30/20 Rule
Find the salary you need to live comfortably in Los Angeles.
Los Angeles Rent Affordability Calculator — 30% Rule
Instantly check if a Los Angeles rental fits your income using local norms.
Louisville Comfortable Salary Calculator
Find the salary you need to live comfortably in Louisville.
Louisville Rent Affordability Calculator
Instantly check if a Louisville rental fits your income using local norms.
Miami Comfortable Salary Calculator
Find the salary you need to live comfortably in Miami.
Miami Rent Affordability Calculator
Instantly check if a Miami rental fits your income using local norms.
Milwaukee Comfortable Salary Calculator
Find the salary you need to live comfortably in Milwaukee
Milwaukee Rent Affordability Calculator
Instantly check if a Milwaukee rental fits your income using local norms
Minneapolis Comfortable Salary Calculator
Find the salary you need to live comfortably in Minneapolis.
Minneapolis Rent Affordability Calculator
Instantly check if a Minneapolis rental fits your income using local norms.
Nashville Comfortable Salary Calculator
Find the salary you need to live comfortably in Nashville.
Nashville Rent Affordability Calculator
Check if a Nashville rental fits your income using local norms.
New York City Comfortable Salary Calculator
Find the salary you need to live comfortably in New York City.
New York City Rent Affordability Calculator
Check if a New York City rental fits your income using local norms.
Philadelphia Comfortable Salary Calculator
Find the salary you need to live comfortably in Philadelphia
Philadelphia Rent Affordability Calculator
Instantly check if a Philadelphia rental fits your income using local norms
Phoenix Comfortable Salary Calculator
Find the salary you need to live comfortably in Phoenix
Phoenix Rent Affordability Calculator
Instantly check if a Phoenix rental fits your income using local norms
Portland Comfortable Salary Calculator
Find the salary you need to live comfortably in Portland, Oregon
Portland Rent Affordability Calculator
Check if a Portland rental fits your income using the 30% rule
San Antonio Comfortable Salary Calculator
Find the salary you need to live comfortably in San Antonio.
San Antonio Rent Affordability Calculator
Instantly check if a San Antonio rental fits your income using local norms.
San Diego Comfortable Salary Calculator
Find the salary you need to live comfortably in San Diego
San Diego Rent Affordability Calculator
Check if a San Diego rental fits your income using the 30% rule
San Francisco Comfortable Salary Calculator
Find the salary you need to live comfortably in San Francisco
San Francisco Rent Affordability Calculator
Check if a San Francisco rental fits your income using the 30% rule
San Jose Comfortable Salary Calculator
Find the salary you need to live comfortably in San Jose
San Jose Rent Affordability Calculator
Check if a San Jose rental fits your income using local norms
Seattle Comfortable Salary Calculator
Find the salary you need to live comfortably in Seattle
Seattle Rent Affordability Calculator
Check if a Seattle rental fits your income using the 30% rule
Tucson Rent Affordability Calculator
Instantly check if a Tucson rental fits your income using local norms.
Savings Goal Calculator
How much to save each month — or how long it takes.
ROI Calculator
Return on investment, net gain and annualised ROI.
Debt Snowball Calculator
See how fast extra payments clear your debts — snowball or avalanche.
Markup vs Margin Calculator
Convert between cost, price, markup and profit margin instantly.
Net Worth Calculator
Add up your assets and liabilities to find your net worth.
UAE Emirates ID Decoder & Validator
Decode a 15-digit Emirates ID — country prefix, birth year and Luhn check digit.
Simple Interest Calculator
Work out simple interest and the total amount on a deposit or loan.
APR Calculator
Find the true annual cost of a loan once fees are included.
Mortgage Overpayment Calculator
See how much interest and time a regular overpayment saves.
Loan Comparison Calculator
Compare two loans side by side to find the cheaper overall deal.
Salary to Hourly Converter
Convert pay between hourly, weekly, monthly and yearly in one place.
Future Value Calculator
Project the future value of savings with regular contributions and compounding.
Debt Avalanche Calculator
Pay off debt fastest — avalanche vs snowball, with a payoff order.
Investment Return Calculator
Project the future value of an investment with regular contributions.
Mortgage Affordability Calculator
See how much home you can afford from your income and deposit.
Amortization Schedule Generator
Full month-by-month payment breakdown for any loan.
Salary Raise Calculator
Turn a raise percentage into real money — after inflation.
Hourly to Annual Salary Calculator
Convert an hourly rate into yearly, monthly and weekly pay.
Sales Commission Calculator
Work out commission earnings from sales and rate — instantly.
Split Bill with Tax and Tip
Split a restaurant bill evenly including tax and tip.
Freelance Rate Calculator
Work out the hourly rate a freelancer needs to charge.
Debt Payoff Planner (Snowball vs Avalanche)
List your debts, compare snowball and avalanche, and see your debt-free date on a chart.
50/30/20 Budget Calculator
Split your take-home pay into needs, wants and savings.
Savings Rate Calculator
Find your savings rate and a rough years-to-FI estimate.
Refinance Break-Even Calculator
Find how long until a refinance pays for itself.
Mortgage Points Calculator
See if buying discount points is worth the up-front cost.
Coast FIRE Calculator
Find the portfolio you need today to coast to retirement.
Money Counter
Add up cash by counting notes and coins.
Expense Tracker
Log spending by category, see monthly totals and a category chart, then export to CSV.
Investment Scenario Comparison
Compare lump-sum, dollar-cost averaging and a mixed strategy side by side.
Tip Per Person Table
One bill and tip — see each person's share for any group size.
Salary Negotiation Modeler
Compare job offers side by side — base, bonus, equity and benefits as one total-comp number.
Savings Goal Tracker
Track multiple savings goals with progress bars and a projection chart.
Gross Rent Multiplier Calculator
Price relative to gross annual rent.
Coast FIRE Calculator (Pro)
See if your pot can coast to retirement, with a year-by-year chart.
Mortgage Overpayment Scenarios
Compare three overpayment strategies side by side on one mortgage.
Event Budget Planner
Plan event costs by category, track vendors and paid status, see the spend breakdown.
Net Worth Tracker
Log assets and liabilities over time and watch your net worth trend.
Debt-Free Date Calculator
See exactly when you'll be debt-free and how much interest you'll pay.
Group Expense Splitter
Add people and shared expenses, then see exactly who owes whom.
Savings Challenge Tracker
Run a 52-week or custom savings challenge, tick off weeks and watch your total grow.
Budget Forecaster
Turn recurring income and expenses into a 12-month projected balance chart.
Amortization Schedule Calculator
Loan amount, rate and term to a full month-by-month principal and interest table.
Invoice Tracker
Track who owes you, what is overdue, and your total outstanding — exportable to CSV.
Wedding Budget Planner
Track estimated vs actual costs, payments and your target — all in your browser.
Debt Snowball Tracker
Plan your debt payoff, compare snowball vs avalanche, and see the date you go debt-free.
Road Trip Cost Splitter
Plan a multi-leg road trip, total fuel, tolls and parking, then split fairly.
Freelance Project Quote Builder
Turn hours and rates into a polished client quote with deposit terms.
Sinking Fund Planner
Plan multiple savings goals and see exactly how much to set aside each month.
Multiplication Table Generator
Make printable times-table charts and blank practice worksheets, then export to PDF.
Car Loan Calculator
Monthly payment, total interest and a full schedule from price, deposit, trade-in, APR, term, fees and tax.
401(k) Calculator
Project your retirement balance from salary, contribution rate, employer match and returns.
CAGR Calculator
Compound annual growth rate from a beginning and ending value.
Dividend Yield Calculator
Turn a share price and dividend into yield %, annual income and yield-on-cost.
FIRE Number Calculator
Find your financial-independence target and how many years until you reach it.
Home Affordability Calculator
How much house can you afford? Income, debts and deposit to a max price.
Inflation Calculator
Convert money between two years and see how inflation erodes its buying power.
Markup Calculator
Turn cost and markup into selling price, profit, and margin — or work it backwards.
Roth IRA Calculator
Project your tax-free retirement balance from contributions, years and return.
Rule of 72 Calculator
How long money takes to double — or the rate needed.
Break-Even Calculator
Find how many units you must sell to cover your costs — with a chart.
Profit Margin Calculator
Cost and price to gross margin, markup, profit and break-even — with reverse solve.
Rent Affordability Calculator
Income, the 30% rule and your expenses — your recommended maximum rent.
Emergency Fund Calculator
Size your safety net and get a month-by-month plan to reach it.
Annuity Calculator
Calculate present value, future value, or periodic payment for any annuity.
Bond Price Calculator
Price a bond from its yield — or back-solve the YTM from a market price.
Bond Yield Calculator
Calculate YTM, bond price, duration, convexity and DV01 instantly.
Gross Profit Calculator
Calculate gross profit, gross margin %, and COGS ratio across multiple periods or product lines.
IRR Calculator
Find the Internal Rate of Return for any series of cash flows — instantly.
NPV Calculator
Calculate Net Present Value, IRR, payback period and a full discounted cash-flow schedule.
Perpetuity Calculator
Price any infinite stream of payments — ordinary, growing, or deferred.
Present Value Calculator
Discount any cash flow stream to today: lump sum, annuity, growing annuity, perpetuity.
Conversions & Units
Unit Converter
Convert length, weight, temperature, volume, area and speed instantly.
Subject Distance & Angle of View Calculator
Find the distance needed to frame a subject of known size
Arc Flash Incident Energy & Boundary Calculator
Estimate arc flash incident energy and the arc-flash boundary using the IEEE 1584 Lee method
Balloon Helium Volume Calculator
Calculate helium tank size needed for a balloon decoration arch or column
Bed Tramming Angle Calculator
Calculate bed tilt angle and the knob turns needed from corner probe data
Beer Dissolved CO2 & Degassing Calculator
Calculate CO2 dissolved in beer at any temperature and pressure
Mash Enzyme Activity Temperature Guide
Find optimal temperature ranges for alpha and beta amylase activity
Camera Motion Blur & Shutter Speed Threshold Calculator
Find the slowest hand-held shutter speed before camera shake blurs the shot
Flash Sync Speed & HSS Calculator
Determine if High Speed Sync is needed and estimate HSS power loss
CO2 Regulator Pressure Guide
Interpret high and low gauge readings and estimate remaining CO2 in the tank
CO2 Tank Pressure vs Temperature Chart
Find expected CO2 tank pressure at any storage temperature
Decoction Volume Calculator
Work out how much mash to pull and boil to step up to the next rest.
Drainage Fixture Unit (DFU) Calculator
Total drainage fixture units and size horizontal drains and stacks per IPC Table 709.1
Enclosure Temperature Calculator
Estimate required enclosure temperature to prevent ABS/ASA/PC warping
EQ Bandwidth to Q Factor Converter
Convert between octave bandwidth and Q factor for parametric EQ.
FDM Bridging Distance Limit Calculator
Estimate the longest unsupported bridge a material and cooling can span
Fermentation Temperature Effect on FG
Estimate how fermentation temperature shifts final gravity and ester production
Filament Drying Time & Temperature Calculator
Get the right drying temperature and duration for wet 3D printing filament
Filament Length to Weight Converter
Convert between filament length in meters and weight in grams
Bass Length-to-Weight Calculator
Estimate largemouth and smallmouth bass weight from a measurement
Fish Weight Estimator by Length & Species
Estimate live fish weight from length using species formulas
Fishing Barometric Pressure Activity Predictor
Predict fish activity levels from barometric pressure and trend
Focal Length Equivalence Table
Compare focal lengths across full-frame, APS-C, MFT, and medium format
EQ Frequency to Note Name Converter
See which musical note corresponds to any EQ frequency band
Gas Pressure Regulator Sizing Calculator
Size first-stage and second-stage gas regulators from total BTU/h demand and inlet pressure.
Hop AAU (Alpha Acid Units) Calculator
Calculate AAU and HBU from hop weight and alpha acid percentage
Hunting Harvest Field-Dress Weight Calculator
Estimate field-dressed and edible meat yield of harvested deer or elk
Makeup Air Unit (MAU) CFM Calculator
Size makeup air CFM to replace exhaust and hold building pressurization
Refrigerant Pressure-Temperature (PT) Chart
Look up saturation temperature from gauge pressure for R-22, R-410A, R-32, R-134a, R-404A, R-407C, R-454B
Hydrometer Temperature Correction
Correct hydrometer gravity readings taken at non-calibration temperatures.
Hz to Musical Note Converter
Identify the closest musical note and cents deviation for any frequency
Infill Density to Weight Calculator
Estimate weight increase from different infill percentages for a given print
Lacto Pitch Temperature Calculator
Find optimal Lactobacillus pitch temperature for sour beer production
Macramé Cord Length Calculator
Calculate working cord lengths for any macramé project
MIDI Note Number Converter
Convert between MIDI note numbers, note names, and Hz frequencies
Miniature Scale Converter
Convert real-world dimensions to any miniature scale (28mm, 1/72, HO, N)
Nozzle Temperature by Material Lookup
Find recommended nozzle and bed temperatures for any 3D printing material
Pet Medication Weight-Based Dosing Calculator
Calculate medicine doses for dogs and cats by weight
Color Temperature & White Balance Calculator
Convert between Kelvin, Mired shift, and white balance preset names
Pipe Flow Velocity & Pressure Drop Calculator
Find flow velocity and Hazen-Williams friction loss for copper, PVC, CPVC, and steel pipe.
Plato / Brix / Specific Gravity Converter
Instantly convert between °Plato, Brix, and specific gravity
Bass Reflex Port Length Calculator
Calculate port tube length for a target tuning frequency
Pottery Clay Weight Calculator
Calculate clay needed for any wheel-thrown or hand-built piece
Print Bed PID Temperature Calculator
Estimate PID parameters for stable print bed temperature control.
Print Orientation & Support Volume Estimator
Compare support volume and print time across different print orientations.
Print Speed vs Quality Tradeoff Calculator
Find the max FDM speed before quality drops for your printer and material
Raised Bed Soil Volume Calculator
Calculate bags or cubic yards of soil for any raised bed
RC Helicopter Blade Pitch & Head Speed Calculator
Find the gear ratio, head speed, and collective pitch for your RC heli
RC Servo Torque & Horn Length Calculator
Calculate required servo torque for any control surface or mechanism
Resin Print Cost & Volume Calculator
Calculate resin cost and volume needed for SLA/MSLA prints
Retraction Distance & Speed Calculator
Get starting retraction values for your printer type and filament
Solar PPFD & DLI Outdoor Garden Calculator
Convert outdoor sun hours to DLI for plant light requirements
Sparge Water Volume Calculator
Work out how much sparge water you need to hit your pre-boil volume.
HVAC Static Pressure Drop Calculator
Sum total external static pressure across filter, coil, ducts and grilles for blower selection
Strike Water Temperature Calculator
Find the exact strike water temp to hit your target mash temperature
Support Material Weight Estimator
Estimate support structure filament weight and cost for complex prints
Temperature Correction Derating Calculator (NEC 310.15)
Derate conductor ampacity for ambient temperatures above 30 °C using NEC correction factors
Time-Lapse Interval & Clip Length Calculator
Calculate shooting interval and total shots for any time-lapse video
A=432 Hz Tuning Converter
Calculate note frequencies in A=432 Hz versus standard A=440 Hz tuning
Volumetric Flow Rate Calculator
Find maximum volumetric throughput for your hotend and filament
Brew Day Water Loss Calculator
Account for every water loss so you hit your target fermenter volume.
Sound Wavelength Calculator
Find the wavelength of any sound frequency in air or water.
Wort Gravity Units & Sugar Content Calculator
Convert specific gravity to gravity points, degrees Plato, and dissolved sugar per litre.
Absorbance ↔ Transmittance / % Transmittance Converter
Convert between A, T, and %T for any spectrophotometer reading
Adjusted Body Weight Calculator
ABW for obese patients when IBW undershoots actual weight
Aircraft CG Envelope Check Tool
Compute loaded weight and CG, then check against a generic GA aircraft envelope
Axle Weight & Load Distribution Calculator
Check axle weight compliance for a loaded semi-truck configuration
Braden Scale for Pressure Injury Risk
Six-domain pressure ulcer risk assessment for hospitalised patients
Brooder Temperature Guide for Chicks
Calculate recommended brooder temperature by week of age for layer and broiler chicks
Building Energy Performance Rating Estimator (EPC/DEC)
Estimate a building's energy rating band from consumption and floor area
Air Freight Chargeable Weight Calculator
Determine air freight chargeable weight using IATA volumetric divisor 6000
Cholesterol Unit Converter (mg/dL to mmol/L)
Convert cholesterol and lipid values across unit systems
Dimensional Weight Calculator
Calculate billed DIM weight for FedEx, UPS, DHL, and USPS using carrier divisors
Dovetail Angle & Layout Calculator
Calculate pin-to-tail ratio, angles, and baseline spacing for hand-cut dovetails
Drill Point Angle Calculator
Determine drill-point cone depth and geometry for any angle and diameter
Drug Dose by Weight Calculator
Calculate weight-based drug doses in mg/kg or mcg/kg for any patient
ENERGY STAR Compliance Qualification Checker
Check if your product category qualifies for ENERGY STAR certification
Enzyme Unit Activity Calculator
Calculate enzyme units (U/mL and U/mg) from a spectrophotometric assay
Estimated Blood Volume Calculator
Estimate total blood volume from weight and patient type
Feeds & Speeds Calculator
Calculate optimal feed rate from chip load, flutes, and spindle RPM
Fuel Economy by Trip Calculator
Calculate actual MPG, fuel cost, and CO2 from any trip distance and fill-up
Fuel Gas Pressure Drop Calculator (NFPA 54)
Verify pressure drop through a gas run stays within 0.3 in WC for low-pressure systems.
Gas Fee gwei → USD Converter
Convert Ethereum gas fees from gwei to USD and ETH in real time
Gel Loading Volume Calculator
Calculate sample and loading dye volumes for agarose gel electrophoresis
Blood Glucose Unit Converter (mg/dL to mmol/L)
Instantly convert blood glucose between mg/dL and mmol/L
Grain Test Weight & Moisture Corrector
Adjust grain test weight and bushel weight to standard moisture for marketing
Haematocrit ↔ Haemoglobin Converter
Estimate Hb from HCT or HCT from Hb using the rule of three
Heparin Weight-Based Dosing Protocol
Bolus and infusion rates for unfractionated heparin by weight
Home Energy CO2 Calculator
Estimate your household's annual carbon footprint from energy use
Evaporator / Condenser Coil Airside Pressure Drop Calculator
Estimate coil pressure drop in inches WC from face velocity and coil rows
Duct Fitting Equivalent Length Calculator
Convert elbows, tees, and diffusers to equivalent straight duct for friction sizing
Ideal Body Weight Calculator (Devine & Robinson)
Calculate IBW for drug dosing and ventilator management
ISA Temperature & Deviation Calculator
Find the standard ISA temperature at altitude and your ISA deviation
Container VGM (Verified Gross Mass) Calculator
Calculate and document container VGM per SOLAS regulation for export declarations
ISO 50001 Energy Management Readiness Checker
Self-assess ISO 50001 energy management system readiness before certification
Temperature Unit Converter (°C / °F / K)
Instantly convert between Celsius, Fahrenheit, and Kelvin
Metal Weight by Shape Calculator
Calculate weight of steel, aluminum, or brass for round, square, hex, or flat bar
Oral Morphine to Fentanyl Patch Converter
Convert daily oral morphine to a transdermal fentanyl patch strength
Mortar Mix & Volume Calculator
Calculate bags of mortar or dry-mix components for any masonry job
Nasogastric Tube Insertion Length Estimator
Estimate NG tube insertion depth from height as a placement starting point
Opioid MME Converter (Morphine Milligram Equivalents)
Convert any opioid dose to morphine equivalents for safe comparison
Paediatric Tidal Volume & Ventilator Settings Calculator
Weight-based ventilator tidal volume for lung-protective ventilation
Parcel Cost-Per-Unit Calculator
Compare shipping cost per unit across different parcel pack configurations
PCR Annealing Temperature Optimizer
Suggest an annealing temperature from primer pair Tm values
Pediatric Weight-Based Dosing Calculator
Safe peds drug doses with weight and max-dose guardrails
Pipe Schedule & Pressure Rating Calculator
Find pipe wall thickness, weight, and working pressure for any schedule and size
Plumbing Fitting Angle & Rolling Offset Calculator
Solve rolling offsets for pipe runs moving simultaneously horizontal and vertical.
Weld Preheat & Interpass Temperature Calculator
Calculate carbon equivalent and minimum preheat for steel per AWS D1.1
Pressure Altitude Calculator
Convert altimeter setting and indicated altitude to pressure altitude
Centrifuge RCF / RPM Converter
Convert between relative centrifugal force and revolutions per minute
Rebar Weight Calculator
Calculate total rebar weight for any bar size, count, and length
Refrigerant System Charge Weight Calculator
Estimate total refrigerant charge from line length and component charges
Refrigerant Leak-Check Nitrogen Pressure Calculator
Find the safe dry-nitrogen leak-test pressure for an HVAC system by refrigerant MAWP
Renewable Energy Certificate (REC/REGO) Cost Calculator
Calculate the cost of matching electricity use with RECs, GOs, or REGOs
Router Bit Speed Calculator
Find the safe RPM range for any router bit diameter to avoid over-speed
Satoshi / Wei / Gwei Unit Converter
Convert between BTC (satoshi, mBTC, BTC) and ETH (wei, gwei, ether) units
Floor Screed Volume Calculator
Calculate sand and cement screed volume plus mix quantities for any floor
Ship ETA / Speed / Time Calculator
Solve for ETA, required speed, or voyage time given any two of three variables
Shipping Emissions Calculator
Calculate CO2e per tonne-km across sea, air, rail, and road freight
Parcel Shipping Zone Calculator
Determine the UPS, FedEx, or USPS zone from origin and destination ZIPs
Sickle Cell Exchange Transfusion Volume Calculator
Calculate RBC exchange volume for HbS% reduction targets
Solana Compute Unit & Priority Fee Estimator
Estimate Solana transaction compute units and the optimal priority fee
Solar Self-Consumption vs. Export Calculator
Model hourly solar vs. load to estimate self-consumption rate and grid export
Sheet Metal Spring-Back Angle Calculator
Estimate the over-bend needed to compensate for spring-back in sheet metal
Structural Steel Beam Weight Calculator
Calculate weight of W, S, HP, C, MC, L, WT, and HSS sections by piece or total order
Tank Volume Calculator
Calculate the volume of cylindrical, rectangular, conical, and spherical tanks in gallons and liters.
Tapping Torque Calculator
Estimate tap torque and check against material/tap-size limits to prevent breakage
Thread Engagement Length Calculator
Calculate minimum thread engagement depth to prevent strip-out in any material
Token Unlock Selling Pressure Estimator
Estimate sell pressure from upcoming token unlocks vs daily volume
Commercial Plumbing Fixture Count Calculator (IPC 403)
Find minimum water closets, urinals, and lavatories required for an occupancy type per IPC.
V-Speeds Reference & Explanation Tool
Look up V-speed definitions, typical values, and use cases for GA aircraft
Vessel Deadweight Utilisation Calculator
Calculate payload, deadweight utilisation, and intake from draft and constants
Vessel Speed-Fuel Optimisation Calculator
Find the speed that minimises total voyage cost including fuel and hire over a fixed distance
Water Pressure Reducing Valve (PRV) Setting Calculator
Set PRV pressure for elevation change and stay within IPC code limits
Aircraft Weight & Balance Calculator
Check that loaded weight and CG stay within limits across your stations
Weld Bead Volume & Filler Metal Weight
Estimate filler metal consumption in kg or lb for any weld joint cross-section
Wind Correction Angle Calculator
Solve the E6B wind triangle for heading and groundspeed in a crosswind
Wire Pulling Tension & Sidewall Pressure Calculator
Check pulling tension and sidewall bearing pressure for large cable pulls per NEMA WC 74.
Overhead Wire Sag & Tension Calculator
Calculate sag and tension for overhead conductors at a given span and temperature
Byte and Bit Size Converter
Convert between bits, bytes, KB, MB, GB, TB in both IEC and SI units
Chinese Sexagenary Cycle Converter
Find the Heavenly Stem and Earthly Branch for any Gregorian year
Countdown Target Date Converter
Convert a future date into a live countdown in days, hours, and minutes
Gregorian ↔ Julian Calendar Converter
Convert dates between the Gregorian and old Julian calendar
Gregorian ↔ Hebrew Date Converter
Convert calendar dates to/from the Hebrew lunisolar calendar
Gregorian ↔ Hijri Date Converter
Convert between Gregorian and Islamic Hijri calendar dates
Julian Day Number Converter
Convert Gregorian dates to and from integer Julian Day Numbers
Mayan Numeral Converter
Represent any integer using the Mayan vigesimal (base-20) dot-and-bar system.
Number to Ordinal Converter
Append ordinal suffixes: 1st, 2nd, 3rd, 4th…
Number to Words Converter
Spell out any integer in English words (one, two, three…)
Sidereal Time Calculator
Compute Greenwich and local sidereal time for astronomy and telescope alignment
12-Hour and 24-Hour Time Converter
Convert times between 12-hour AM/PM and 24-hour military format
Acres to Hectares Converter
Convert ac to ha instantly — 1 ac = 0.4046856422 ha. Free, browser-only tool.
Acres to Square Metres Converter
Convert ac to m² instantly — 1 ac = 4046.856422 m². Free, browser-only tool.
Bar to PSI Converter
Convert bar to psi instantly — 1 bar = 14.50377378 psi. Free, browser-only tool.
Bytes to Kilobytes Converter
Convert B to KB instantly — 1 B = 0.001 KB. Free, browser-only tool.
Celsius to Fahrenheit Converter
Convert °C to °F instantly — °F = °C × 1.8 + 32. Free, browser-only tool.
Celsius to Kelvin Converter
Convert °C to K instantly — K = °C + 273.15. Free, browser-only tool.
Centimetres to Inches Converter
Convert cm to in instantly — 1 cm = 0.3937007874 in. Free, browser-only tool.
US Cups to Millilitres Converter
Convert cup to mL instantly — 1 cup = 236.5882365 mL. Free, browser-only tool.
Fahrenheit to Celsius Converter
Convert °F to °C instantly — °C = °F × 0.5555555556 − 17.77777778. Free, browser-only tool.
Feet to Metres Converter
Convert ft to m instantly — 1 ft = 0.3048 m. Free, browser-only tool.
US Gallons to Litres Converter
Convert gal to L instantly — 1 gal = 3.785411784 L. Free, browser-only tool.
Gigabytes to Terabytes Converter
Convert GB to TB instantly — 1 GB = 0.001 TB. Free, browser-only tool.
Gigabytes to Megabytes Converter
Convert GB to MB instantly — 1 GB = 1000 MB. Free, browser-only tool.
Grams to Ounces Converter
Convert g to oz instantly — 1 g = 0.03527396198 oz. Free, browser-only tool.
Hectares to Acres Converter
Convert ha to ac instantly — 1 ha = 2.471053815 ac. Free, browser-only tool.
Inches to Centimetres Converter
Convert in to cm instantly — 1 in = 2.54 cm. Free, browser-only tool.
Inches to Millimetres Converter
Convert in to mm instantly — 1 in = 25.4 mm. Free, browser-only tool.
Kilobytes to Bytes Converter
Convert KB to B instantly — 1 KB = 1000 B. Free, browser-only tool.
Kilobytes to Megabytes Converter
Convert KB to MB instantly — 1 KB = 0.001 MB. Free, browser-only tool.
Kelvin to Celsius Converter
Convert K to °C instantly — °C = K − 273.15. Free, browser-only tool.
Kilograms to Stone Converter
Convert kg to st instantly — 1 kg = 0.1574730444 st. Free, browser-only tool.
Kilograms to Pounds Converter
Convert kg to lb instantly — 1 kg = 2.204622622 lb. Free, browser-only tool.
Kilometres to Miles Converter
Convert km to mi instantly — 1 km = 0.6213711922 mi. Free, browser-only tool.
Kilometres per Hour to Knots Converter
Convert km/h to kn instantly — 1 km/h = 0.5399568035 kn. Free, browser-only tool.
Kilometres per Hour to Miles per Hour Converter
Convert km/h to mph instantly — 1 km/h = 0.6213711922 mph. Free, browser-only tool.
Knots to Kilometres per Hour Converter
Convert kn to km/h instantly — 1 kn = 1.852 km/h. Free, browser-only tool.
Pounds to Kilograms Converter
Convert lb to kg instantly — 1 lb = 0.45359237 kg. Free, browser-only tool.
Litres to US Gallons Converter
Convert L to gal instantly — 1 L = 0.2641720524 gal. Free, browser-only tool.
Litres to Millilitres Converter
Convert L to mL instantly — 1 L = 1000 mL. Free, browser-only tool.
Megabytes to Gigabytes Converter
Convert MB to GB instantly — 1 MB = 0.001 GB. Free, browser-only tool.
Megabytes to Kilobytes Converter
Convert MB to KB instantly — 1 MB = 1000 KB. Free, browser-only tool.
Metres to Feet Converter
Convert m to ft instantly — 1 m = 3.280839895 ft. Free, browser-only tool.
Miles to Kilometres Converter
Convert mi to km instantly — 1 mi = 1.609344 km. Free, browser-only tool.
Millilitres to US Cups Converter
Convert mL to cup instantly — 1 mL = 0.004226752838 cup. Free, browser-only tool.
Millilitres to Litres Converter
Convert mL to L instantly — 1 mL = 0.001 L. Free, browser-only tool.
Millimetres to Inches Converter
Convert mm to in instantly — 1 mm = 0.03937007874 in. Free, browser-only tool.
Ounces to Grams Converter
Convert oz to g instantly — 1 oz = 28.3495231 g. Free, browser-only tool.
PSI to Bar Converter
Convert psi to bar instantly — 1 psi = 0.0689475729 bar. Free, browser-only tool.
Square Feet to Square Metres Converter
Convert ft² to m² instantly — 1 ft² = 0.09290304 m². Free, browser-only tool.
Square Metres to Acres Converter
Convert m² to ac instantly — 1 m² = 0.0002471053815 ac. Free, browser-only tool.
Square Metres to Square Feet Converter
Convert m² to ft² instantly — 1 m² = 10.76391042 ft². Free, browser-only tool.
Stone to Kilograms Converter
Convert st to kg instantly — 1 st = 6.35029318 kg. Free, browser-only tool.
Terabytes to Gigabytes Converter
Convert TB to GB instantly — 1 TB = 1000 GB. Free, browser-only tool.
Area Calculator
Area of a rectangle, triangle, circle, trapezoid and more.
Volume Calculator
Volume of a box, sphere, cylinder, cone and more.
MPG to L/100km Converter
Convert miles-per-gallon to litres-per-100km and back, UK or US gallons.
Weighted Grade Calculator
Combine scores and category weights into a single weighted grade.
Julian to Gregorian Date Converter
Convert dates between the Julian and Gregorian calendars.
Hijri to Gregorian Converter
Convert an Islamic (Hijri) date to the Gregorian calendar.
Hebrew Calendar Converter
Convert a Gregorian date to the Hebrew (Jewish) calendar.
Persian (Jalali) Calendar Converter
Convert between Gregorian and Persian (Solar Hijri / Jalali) dates.
Ethiopian Calendar Converter
Convert between Gregorian and Ethiopian (Ge'ez) dates.
Thai Buddhist Date Converter (BE ⇄ CE)
Convert between Gregorian dates and the Thai Buddhist Era (พ.ศ.).
Nepali Bikram Sambat Converter (BS ⇄ AD)
Convert between Gregorian dates and the Nepali Bikram Sambat calendar.
Japanese Era Converter (Gengō / 和暦)
Convert between Gregorian dates and Japanese era years (Reiwa, Heisei…).
Coptic Calendar Converter (A.M. ⇄ Gregorian)
Convert between Gregorian dates and the Coptic calendar (Anno Martyrum).
Miles to Nautical Miles Converter
Convert mi to nmi instantly — 1 mi = 0.868976 nmi. Free, browser-only tool.
Celsius to Rankine Converter
Convert °C to °Ra instantly — °Ra = °C × 1.8 + 491.67. Free, browser-only tool.
Fahrenheit to Kelvin Converter
Convert °F to K instantly — K = (°F − 32) × 5/9 + 273.15. Free, browser-only.
Bits to Bytes Converter
Convert bits, bytes, kbit, KB, Mbit, MB, Gbit and GB — 1 byte = 8 bits.
File Size Converter
Convert B, KB, MB, GB, TB and binary KiB, MiB, GiB side by side.
Unit Price Comparison Calculator
Compare price per unit across pack sizes to find the best value.
Philippines TIN Validator
Check the structure of a Philippine tax ID number (TIN) instantly.
Grams to Kilograms Converter
Convert g to kg instantly — 1 kg = 1000 g. Free, browser-only tool.
Tonnes to Kilograms Converter
Convert t to kg instantly — 1 t = 1000 kg. Free, browser-only tool.
Yards to Meters Converter
Convert yd to m instantly — 1 yd = 0.9144 m. Free, browser-only tool.
Meters to Yards Converter
Convert m to yd instantly — 1 yd = 0.9144 m. Free, browser-only tool.
Miles to Yards Converter
Convert mi to yd instantly — 1 mi = 1760 yd. Free, browser-only tool.
Feet to Inches Converter
Convert ft to in instantly — 1 ft = 12 in. Free, browser-only tool.
Inches to Feet Converter
Convert in to ft instantly — 1 ft = 12 in. Free, browser-only tool.
Nautical Miles to Kilometers Converter
Convert nmi to km instantly — 1 nmi = 1.852 km. Free, browser-only tool.
Milliliters to Teaspoons Converter
Convert mL to US teaspoons (and back) instantly.
Milliliters to Tablespoons Converter
Convert mL to US tablespoons (and back) instantly.
Fahrenheit to Rankine Converter
Convert °F to °Ra (and back) instantly.
Square Kilometers to Square Miles Converter
Convert km² to mi² (and back) instantly.
Grams to Cups (Flour) Converter
Convert flour between grams and US cups by type.
Grams to Cups (Sugar) Converter
Convert sugar between grams and US cups by type.
Butter Converter
Convert butter between grams, ounces, cups, sticks and tablespoons.
Millilitres to Fluid Ounces Converter
Convert ml to US and UK fluid ounces, both ways.
Fuel Economy Comparison
Compare two vehicles by annual fuel cost — MPG or L/100km.
Frequency & Wavelength Calculator
Convert between frequency and wavelength for any wave.
Potential Energy Calculator
Gravitational PE = m·g·h — solve for energy, mass, or height.
Speed of Sound Calculator
Speed of sound in air at any temperature, plus travel time.
kWh to MJ Converter
Convert kilowatt-hours to megajoules and back, exactly.
Torque N·m to ft·lb Converter
Convert newton-metres to foot-pounds instantly — 1 ft·lb = 1.3558179 N·m. Free, browser-only.
Pascal to Bar Converter
Convert pascals to bar instantly — 1 bar = 100000 Pa. Free, browser-only.
Mbps to MB/s Converter
Convert internet speed in megabits to file transfer in megabytes per second.
Gbps to Mbps Converter
Convert gigabit per second link speeds to megabits per second.
Alcohol Units Calculator
UK units and US standard drinks from volume and ABV.
Rectangle Calculator
Area, perimeter and diagonal of a rectangle.
Sample Rate Converter
Find the resampling ratio between two audio sample rates.
Frame Rate Converter
Convert between video frame rates and frame counts.
Weeks to Days Converter
Convert weeks to days (and back) instantly.
Days to Hours Converter
Convert days to hours (and back) instantly.
Hours to Minutes Converter
Convert hours to minutes (and back) instantly.
Minutes to Seconds Converter
Convert minutes to seconds (and back) instantly.
Years to Months Converter
Convert years to months (and back) instantly.
Months to Weeks Converter
Convert months to weeks (and back) using the average month.
Kelvin to Fahrenheit Converter
Convert Kelvin to Fahrenheit and back.
Square Feet to Acres Converter
Convert square feet to acres and back.
Cups to Grams Rice Converter
Convert cups of rice to grams instantly — by rice type. Free, browser-only.
Tablespoons to Cups Converter
Convert tbsp to cups instantly — 1 cup = 16 tbsp. Free, browser-only tool.
US Quarts to Litres Converter
Convert qt to L instantly — 1 qt = 0.946352946 L. Free, browser-only tool.
US Pints to Millilitres Converter
Convert pt to mL instantly — 1 pt = 473.176473 mL. Free, browser-only tool.
US Gallons to Cups Converter
Convert gal to cups instantly — 1 gallon = 16 cups. Free, browser-only tool.
Fluid Ounces to Millilitres Converter
Convert fl oz to mL instantly — 1 fl oz = 29.5735 mL. Free, browser-only tool.
Water Intake by Body Weight Calculator
How much water to drink based on your weight.
Air Fryer Conversion Calculator
Convert any oven recipe to air fryer temperature and time.
Egg Size Substitution Calculator
Swap small, medium, large or jumbo eggs in any recipe.
International Shoe Size Converter
Convert shoe sizes between US, UK, EU and centimetres.
Hat Size Converter
Turn head circumference into US, UK, EU and S–XL hat sizes.
Bra Size Converter
Convert bra sizes between UK, US, EU, FR and AU/NZ.
Glove Size Converter
Convert hand circumference into numeric and S–XL glove sizes.
Belt Size Converter
Find your belt size from waist measurement in inches, cm or letters.
GPA to Letter Grade Converter
Turn a 4.0-scale GPA into its letter grade instantly.
Milligrams to Grams Converter
Convert mg to g instantly — 1 g = 1000 mg. Free, browser-only tool.
Micrograms to Milligrams Converter
Convert µg to mg instantly — 1 mg = 1000 µg. Free, browser-only tool.
Centimeters to Meters Converter
Convert cm to m instantly — 1 m = 100 cm. Free, browser-only tool.
Kilometers to Meters Converter
Convert km to m instantly — 1 km = 1000 m. Free, browser-only tool.
Millimeters to Centimeters Converter
Convert mm to cm instantly — 1 cm = 10 mm. Free, browser-only tool.
Miles per Gallon UK to US Converter
Convert fuel economy between UK and US miles per gallon.
Knots to MPH Converter
Convert knots to miles per hour, both directions.
Weekly Meal Planner and Shopping List
Plan a week of meals and auto-build a combined shopping list.
Unit Price Comparator
Compare products by price per kg, litre or item to find the best value.
PPI Calculator
Turn resolution and screen size into pixels-per-inch, dot pitch and a retina check.
Fuel Economy Converter
Convert MPG (US/UK), L/100km and km/L instantly, with a cost estimate.
Weighted Random Picker
Pick winners with custom odds — weighted, cryptographically fair, with live stats.
Power Converter
Convert watts, kilowatts, megawatts, horsepower, BTU/h and ft·lb/s.
Area Converter
Convert between mm², cm², m², hectares, km², acres, square feet and more.
Angle Converter
Convert between degrees, radians, gradians, turns, arcminutes and arcseconds.
Clothing Size Converter (US / UK / EU / IT)
Convert clothing sizes between US, UK, EU and Italian sizing for tops, dresses and jackets.
Data Storage Converter
Convert bits, bytes, KB, MB, GB, TB and PB in decimal (1000) or binary (1024) mode.
Energy Converter
Convert joules, calories, watt-hours, BTU, foot-pounds and electronvolts.
Frequency Converter
Convert Hz, kHz, MHz, GHz, RPM and period (seconds) — type any field, the rest update live.
Length Converter
Convert between mm, cm, m, km, inches, feet, yards, miles and more — live.
Pressure Converter
Convert between Pa, kPa, bar, psi, atm, mmHg, torr and inHg instantly.
Shoe Size Converter
Convert shoe sizes between US, UK, EU and CM for men, women and kids.
Speed Converter
Convert between m/s, km/h, mph, knots, ft/s and Mach instantly.
Temperature Converter
Convert Celsius, Fahrenheit, Kelvin and Rankine with exact formulas.
Time Unit Converter
Convert between nanoseconds, seconds, hours, days, weeks, months and years.
Torque Converter
Convert torque between N·m, kgf·m, lbf·ft, lbf·in and dyn·cm.
Volume Converter
Convert ml, litres, cubic metres, teaspoons, cups, pints, quarts and gallons (US and UK).
Weight & Mass Converter
Convert milligrams, grams, kilograms, tonnes, ounces, pounds, stones and tons in one live grid.
Ring Size Converter
Convert ring sizes between US, UK, EU, circumference and diameter.
Speed Distance Time Calculator
Enter any two of speed, distance, or time — instantly solve for the third.
Wavelength & Frequency Calculator
Convert wavelength, frequency and photon energy in any direction.
Julian Date Converter
Convert Gregorian dates to Julian Dates (JD, JDN, MJD) and back — instantly in your browser.
Celsius to Fahrenheit Converter
Instantly convert between °C, °F, Kelvin, Rankine and Réaumur — with formulas shown.
Kg to Pounds Converter
Instantly convert kilograms to pounds (and stones + pounds) — or reverse.
Fahrenheit to Celsius Converter
Instantly convert any temperature between °F and Celsius — with full working shown.
Grams to Ounces Converter
Instantly convert grams to ounces (and back) with the exact NIST factor.
Ounces to Grams Converter
Convert oz to g instantly — 1 oz = 28.3495 g. Free, browser-only tool.
Pounds to Kilograms Converter
Instantly convert lb to kg — decimal or stone+lb entry, full conversion grid.
Stone to Pounds Converter
Convert st to lb instantly — 1 stone = 14 pounds exactly. Free, browser-only tool.
Pounds to Stone Converter
Convert pounds to stones and pounds — with kilograms too.
Date & Time
Age Calculator
Your exact age in years, months and days — plus next-birthday countdown.
India PAN Card Decoder — Validate & Decode Your PAN
Decode every segment of an Indian PAN — holder type, name initial, and series.
Candle Container Wax Shrinkage & Top-Up Calculator
Calculate the second-pour wax amount for container candle sinkholes
Cat Age in Human Years Calculator
Convert your cat's age to the equivalent human age
CCD / CMOS Image Scale Calculator
Calculate arcseconds per pixel for your telescope and camera combo
Chicken Egg Incubation Due Date Calculator
Calculate hatch date and lockdown date for any egg species
Days of Autonomy Calculator
Find how many days a battery bank powers a load with no solar recharge.
Dog Age in Human Years Calculator
Calculate your dog's equivalent human age by breed size
Frost Date Planting Schedule Calculator
Count back from last frost date to find indoor seed-starting dates
HVAC Tonnage Calculator
Convert a BTU/h cooling load to tons of refrigeration and size equipment to the nearest half-ton
Image File Size Calculator
Estimate RAW and JPEG file size from megapixels and bit depth
Lorcana Willpower & Lore Race Calculator
Track lore progress and calculate damage for Disney Lorcana
Resin Casting Shrinkage & Mold Size Calculator
Account for resin shrinkage when designing or ordering molds
3D Print Shrinkage & Tolerance Calculator
Compensate for material shrinkage when designing tight-tolerance parts
Garden Soil Drainage Percolation Calculator
Rate soil drainage from a simple timed percolation test
Time-Lapse Storage Estimator
Calculate SD card / SSD storage needed for any time-lapse shoot
Warhammer Age of Sigmar Points Calculator
Tally AoS army list points quickly
Age-Appropriate Design Code Checker
Check your children's service against the UK Children's Code (AADC)
Beers Criteria High-Risk Drug Checker for Older Adults
Flag potentially inappropriate medications per AGS Beers Criteria
Bitcoin Halving Countdown
Calculate blocks and days until the next Bitcoin halving event
Demurrage & Detention Calculator
Calculate container demurrage and detention from free-time and daily rates
Duct Leakage Test Calculator
Calculate duct leakage from blower-door test results per ACCA Manual D and IECC 2021.
France Allocation Chômage (ARE) Calculator
Calculate French unemployment benefit (ARE) daily reference wage
Grain Storage Capacity Calculator
Calculate bushels or tonnes of grain in cylindrical bins, flat storage, and piles
Growing Degree Days (GDD) Calculator
Accumulate GDDs for corn, wheat, or soybeans to predict crop development stages
India Working Days Counter
Count working days in India excluding gazetted public holidays
Leverage Liquidation Price Calculator
Calculate liquidation price for long/short futures with cross or isolated margin
Sample Freeze-Thaw Cycle Tracker
Log and limit freeze-thaw cycles for biological sample integrity
Sea Passage Fuel Cost Calculator
Calculate voyage bunker cost at different speeds using the cube-law model
DEX Slippage Calculator
Calculate expected slippage and minimum received on DEX token swaps
UK Bank Holiday Working Days Counter
Count UK working days excluding England/Scotland/NI bank holidays
US Federal Holiday Working Days Counter
Count net working days excluding US federal holidays
Welding Amperage by Material Thickness
Estimate correct amperage for stick, MIG, or TIG welding any steel thickness
Wood Glue Coverage Calculator
Estimate glue quantity needed for any glue-up area at recommended spread rate
Next Weekday Date Calculator
Find the next Monday, Friday, or other weekday after a date
Quarter of Year Calculator
Determine which fiscal/calendar quarter a date falls in
Date Difference Calculator
Days, weeks and full calendar gap between any two dates.
Week Number Calculator
ISO 8601 and US week number for any date.
Add or Subtract Days Calculator
Add or subtract days, weeks, months or years from a date.
Day of the Week Finder
What day of the week was — or will be — any date.
Easter Date Calculator
Find the date of Easter Sunday for any year.
Age in Weeks and Days Calculator
Convert any age or date span into weeks and days.
Egypt National ID Decoder — Date of Birth, Governorate & Gender
Decode a 14-digit Egyptian National ID — century, date of birth, governorate and gender.
Age in Hijri Years Calculator
Convert your birth date to the Islamic calendar and get your age in Hijri years.
Ramadan Date Estimator
Estimate the Gregorian date Ramadan begins in any year.
Diwali Date Estimator
Find the date of Diwali (Lakshmi Puja) for any year.
Days Until a Date
Count how many days are left until any date — or how many have passed.
Weeks Between Two Dates
Count the number of weeks (and leftover days) between any two dates.
Age in Months and Days
Find an exact age in months and days from any birth date.
Next Birthday Countdown
See how many days until your next birthday and which weekday it falls on.
Dog Age Calculator
Convert your dog's age to human years by size and breed group.
Cat Age Calculator
Convert your cat's age to human years and life stage.
Days Alive Calculator
Find out exactly how many days you have been alive.
Age on Other Planets
See how old you would be on Mars, Jupiter and every other planet.
Countdown to New Year
Live countdown to midnight on 1 January in your local time.
Half-Birthday Calculator
Find your half-birthday — six months from the day you were born.
Data Cap Usage Calculator
Track data used against your monthly cap and project end-of-cycle usage.
Storage Needed Calculator
Estimate total storage for a batch of files from count and average size.
Work Days Between Dates
Count the working days between two dates, weekends excluded.
ISO Week Number Calculator
Find the ISO 8601 week number for any date.
Julian Day Number Calculator
Convert a calendar date to its Julian Day Number, JD and MJD.
Days in Month Calculator
How many days are in any month of any year?
Weekly Time Card Calculator
Add up a week of clock-in / clock-out times and breaks.
Age Gap Calculator
Find the age difference between two people.
Countdown to Christmas
Live days, hours, minutes and seconds until Christmas Day.
Countdown to Birthday
Live countdown to your next birthday from your date of birth.
Sprint Date Calculator
Generate agile sprint start and end dates from a cadence.
Mileage Log & Reimbursement Tracker
Log business trips and auto-calculate mileage reimbursement, with CSV export.
CCTV Storage Calculator
Size hard drives for a security camera system: cameras, resolution, retention.
Printable Calendar Generator
Make a clean printable PDF calendar for any month or full year.
Day of Week Calculator
Find any date's weekday, ISO week number, day-of-year and Julian Day Number — with step-by-step working.
Quarter of Year Calculator
Find which quarter any date falls in — with fiscal-year variants and progress bars.
Days Since Calculator
Find exactly how many days, weeks, months and years between any two dates.
Add Days to Date Calculator
Add or subtract any number of days from a date and see the full result instantly.
Days Until Birthday Calculator
Instantly see how many days until any birthday — with zodiac, birthstone, milestones and a live countdown.
Days Until Christmas Calculator
Exact days, sleeps, weeks and hours until Christmas Day — live, in your time zone.
Months Between Dates Calculator
Find the exact number of complete calendar months between any two dates.
Subtract Days from Date Calculator
Pick any date, enter a number of days, get the exact result instantly.
Weekly Time Card Calculator
Total your hours worked, split regular vs overtime, and calculate gross pay — all in one place.
Weeks Between Dates Calculator
Count the exact weeks (and leftover days) between any two dates instantly.
Working Hours Calculator
Add up daily shifts, subtract breaks, and compute gross pay with overtime.
Photo & Video
Audio File Size Calculator
Estimate uncompressed WAV/AIFF size from sample rate, bit depth and length.
Hyperfocal Distance Calculator
Find the hyperfocal distance for maximum depth of field at any aperture
Megapixel to Print Size Calculator
Find the largest print at your target DPI from your camera's megapixels
Hyperfocal Depth Chart Generator
Generate a complete hyperfocal distance table for every aperture and focal length
Astrophoto Depth of Field & Hyperfocal Distance
Calculate hyperfocal distance for sharp foreground & star-field shots
Download Time Calculator
Estimate how long a download takes from file size and connection speed.
Bandwidth Calculator
Estimate monthly bandwidth from page weight and visits per month.
Video File Size Calculator
Estimate a video file's size from duration and bitrate.
Audio File Size Calculator
Estimate audio file size for MP3, AAC or uncompressed WAV.
Upload Time Calculator
Estimate how long a file takes to upload at your real connection speed.
Crop Factor Calculator
Sensor size to crop factor, equivalent focal length and equivalent aperture — instant and precise.
Depth of Field Calculator
Near/far limits, hyperfocal distance, solve-for-any-variable and full aperture comparison.
Hyperfocal Distance Calculator
Focal length, aperture and sensor CoC to maximum depth of field — solve any variable.
More Calculators
Indonesia NIK (KTP) Decoder
Decode a 16-digit Indonesian NIK — province, date of birth and gender.
JAMB / Post-UTME / WAEC Aggregate Score Calculator
Work out your Nigerian university aggregate from JAMB, Post-UTME and O'level.
UK Statutory Entitlement Calculator (Maternity, Redundancy, Notice)
Work out Statutory Maternity Pay, redundancy pay and notice using 2025/26 rates.
Kenya Payslip & Net Pay Calculator (PAYE, SHIF, NSSF, Housing Levy)
Net pay after PAYE, SHIF, NSSF and the Affordable Housing Levy, explained.
Discount & Sale Price Calculator
Find the sale price, work out % off, or combine multiple stacked discounts.
Fuel Cost Calculator
Calculate trip fuel cost in miles/mpg or km/L per 100km, with cost splitting.
Brazil MEI DAS Calculator — Monthly Simples Nacional Payment (2025)
Calcule o DAS mensal do MEI por tipo de atividade — valores fixos 2025.
GPA Calculator
Calculate your GPA — US 4.0, UK Honours, or India 10-point CGPA.
Mexico RFC & CURP Decoder + ISR Net Pay Calculator (2024)
Decode your RFC or CURP and see your take-home pay after ISR — all in your browser.
ABV Calculator
Calculate alcohol by volume from original and final gravity readings
Apparent Attenuation Calculator
Measure how thoroughly your yeast fermented the available sugars from OG and FG.
Astrophotography Target Framing Calculator
Check if a deep-sky object fits your sensor's field of view
Astrophotography Mosaic Panel Calculator
Calculate panel count and grid layout for a multi-frame mosaic
Astrophotography Total Exposure Calculator
How many subs and how much total time for a target SNR
Audio Buffer Size & Latency Calculator
Convert buffer size and sample rate to round-trip audio latency in ms
Mix Bus Clip Headroom Calculator
Calculate how much headroom to leave on the mix bus for mastering
Theoretical Noise Floor by Bit Depth Calculator
Calculate the theoretical dynamic range and noise floor for any bit depth
Australia Superannuation Calculator
Calculate Australian employer super contributions at the current SG rate
Backflow Preventer Sizing & Selection Guide
Pick the right backflow assembly type by hazard degree and back-pressure or back-siphonage risk.
Ballistic Zero Range Calculator
Find the optimal zero and maximum point-blank range for your rifle.
Brew Batch Scaling Calculator
Scale any homebrew recipe up or down to a new batch volume.
Bead Count & Spacing Calculator
Calculate bead counts and spacing for bracelets, necklaces, and patterns
Beekeeping Honey Yield Estimator
Estimate honey yield from hive inspection data
Hop Bitterness Decay Calculator
Model IBU reduction over storage time and temperature for hop-forward beers
Beer Style Parameter Range Checker
Check if your OG, FG, IBU, ABV, and SRM fit the BJCP style guidelines
Board Game Auction / Trade Value Calculator
Estimate a fair trade or auction value for board games by condition
Board Game Score Sheet Generator
Digital score tracker for any board game
Box Fill Calculator (NEC 314.16)
Sum conductor, device, clamp, and fitting equivalents to verify junction/outlet box fill
Brazil INSS Contribution Calculator
Calculate Brazilian social-security (INSS) contributions
Brew Water Boiling Hardness Reducer
Calculate carbonate hardness reduction from pre-boiling brewing water
Brew Day Timeline Planner
Build a timed, step-by-step brew day schedule from your start time and step durations.
Wine Chaptalization (Sugar Addition) Calculator
Calculate the sugar needed to raise must Brix to a target potential ABV
Bullet Drop Ballistics Calculator
Calculate bullet drop and wind drift for any rifle cartridge to 1000 yards.
Bundling (Adjustment Factor) Derating Calculator (NEC 310.15(C))
Apply NEC bundling adjustment factors when more than 3 current-carrying conductors share a raceway
Busbar Ampacity Calculator
Estimate the current-carrying capacity of copper or aluminum bus bars.
Camera Angular Resolution Calculator
Find the minimum resolvable angle for a camera sensor and lens
Camera Sensor Size Comparison Tool
Compare physical sensor dimensions and crop factors across camera formats
Canada CPP Contribution Calculator
Calculate Canadian Pension Plan contributions for employee and employer
Cat Food Daily Portion Calculator
Calculate ideal daily food amount for your cat
HVAC CFM Airflow Calculator
Calculate required supply-air CFM from a room's heat load and supply-air temperature difference
Solar Charge Controller Sizing Calculator
Size an MPPT or PWM charge controller from array short-circuit current and battery voltage.
Chess Elo Rating Calculator
Calculate expected score and new Elo after chess games
Chess Performance Rating Calculator
Calculate your tournament performance rating from results
Cider ABV Calculator
Calculate the alcohol content of hard cider from juice gravity and FG.
Circuit Breaker Sizing Calculator
Size branch-circuit breakers for resistive loads, motors, and HVAC per NEC 240 and 430
3D Print Clearance & Fit Tolerance Calculator
Find the right gap for press-fit, slide-fit and loose-fit printed joints
CO2 Production During Fermentation
Estimate grams of CO2 produced and residual dissolved CO2 level
Coin Collection Insurance Value Estimator
Total your coin collection's declared value for insurance
Coin Grading Reference Tool
Look up Sheldon scale (1-70) coin grade descriptions and values
Coin Melt Value Calculator
Calculate the melt value of silver and gold coins by weight and purity
Condensate Drain Line Sizing Calculator
Size HVAC condensate drain lines by system capacity using the 0.8 GPH-per-ton rule and IMC Table 307.2.2
Parallel Conductor Sizing Calculator (NEC 310.10(H))
Size parallel sets of conductors for large feeders per the NEC 310.10(H) 1/0 AWG minimum rule
Cooling Load Quick Estimate (Rule of Thumb) Calculator
Estimate tonnage from floor area, window ratio, and climate zone — fast pre-quote sizing
Crossover Frequency Calculator
Find the cap and inductor values for a passive speaker crossover.
Dark Frame Count Optimization Calculator
How many dark frames do you actually need for calibration?
dB SPL Distance Calculator
Predict how loud a source is at a new distance using the inverse square law.
Dew Point Risk Calculator for Optics
Know if your telescope mirror or lens will dew over tonight
Dog Food Daily Portion Calculator
Calculate ideal daily food amount for your dog by weight and activity
Drum Tuning Frequency Calculator
Find target fundamental frequencies for kick, snare, and toms by genre
Dry Hop Biotransformation Window Calculator
Time dry hop additions to the active fermentation biotransformation window
Dry Hop Rate Calculator
Convert a target g/L dry hop rate into total hop weight for your batch
Equal Loudness Level Calculator
Compare how loud two frequencies sound at equal SPL using ISO 226.
Equal Temperament vs Just Intonation Comparator
Compare interval frequencies between equal temperament and just intonation.
ESC Current Rating Calculator
Size your ESC correctly for any motor and battery combination
EV Charger Load & Wiring Calculator
Size the circuit, wire, and breaker for Level 1, Level 2, or DC fast-charge EV installations.
Exposure Bracketing Calculator
Generate a bracket sequence of exposures around a base value
Exposure Value (EV) Calculator
Find equivalent exposures across aperture, shutter speed, and ISO
Eyepiece True Field of View Calculator
Calculate true field of view for any eyepiece and telescope
Fermentation CO2 Airlock Bubble Rate Interpreter
Estimate fermentation stage from airlock bubble frequency
Field of View Calculator
Calculate horizontal, vertical, and diagonal field of view for any lens and sensor
3D Print Filament Cost Calculator
Calculate material cost for any 3D print from filament price and weight
Filament Spool Remaining Calculator
Estimate grams remaining on a partly used spool from weight or coil diameter
First Layer Line Width Optimizer
Calculate optimal first-layer width and height for best bed adhesion
Fishing Bag Limit Tracker
Log your catch by species and size and track it against local bag limits.
Fishing Casting Distance Estimator
Estimate casting distance from rod length, lure weight, and line
Fishing Knot Strength Calculator
Estimate knot breaking strength as a percent of your line's test
Flash Guide Number Calculator
Calculate flash power, distance, or aperture from a guide number
Flash Power Reduction in Stops Calculator
Convert a flash power reduction (1/2, 1/4, 1/8...) into f-stops and the aperture or distance change to match it.
Fly Line Trolling Depth Calculator
Find the depth of a sinking fly line at any sink time and speed
Fly Tying Hook Size & Hatch Match Reference
Match hook size to natural insect size for tying flies
Focus Breathing Compensation Calculator
Estimate focal length shift from focus breathing at any distance
Focus Peaking Contrast Threshold Guide
Select the right focus peaking sensitivity level for your aperture and subject
FPV Video Frequency Channel Planner
Plan FPV frequencies to avoid interference at a flying session
France Cotisations Sociales Calculator
Estimate employee-side French social contributions on gross salary
Companion Planting Reference Tool
Look up companion and antagonist plant pairings for your garden
Generator Fuel Runtime Calculator
Estimate how long a gasoline, diesel, or propane generator runs on a given fuel quantity.
Germany Social Insurance Calculator
Calculate German Kranken-, Pflege-, Renten- and Arbeitslosenversicherung
Grain Bill Color & OG Optimizer
Adjust a two-malt grain bill to hit both your target OG and SRM colour
Gravity Points Per Pound Calculator
Predict your original gravity from grain weight, extract potential, and efficiency.
Ground Fault Loop Impedance Calculator
Verify that fault current through the EGC is enough to trip the breaker in time.
Grow Light PPFD & DLI Calculator
Calculate PPFD and daily light integral for any grow light setup
Grow Tent Ventilation & CFM Calculator
Size an inline extraction fan for your grow tent in CFM
Harmonic Derating (K-Factor) Calculator
Calculate transformer K-factor from a harmonic current spectrum to select a K-rated transformer
Harmonic Series Calculator
Generate the harmonic series (overtones) above any fundamental frequency
Knit Hat Sizing Calculator
Calculate cast-on and decrease rounds for any head size
Heat Pump Balance Point Calculator
Find the outdoor temp where heat pump capacity equals building heat loss for backup staging
Heat-Set Insert Hole Size Calculator
Get the correct boss hole diameter for heat-set threaded inserts
Hop Substitution AA% Adjuster
Adjust hop weight when swapping varieties so the bitterness stays the same.
Hunting BDC Reticle Holdover Calculator
Calculate which BDC reticle subtension to use at any hunting distance
Supply Grille/Diffuser Velocity & CFM Calculator
Calculate CFM from neck velocity and grille area, or find velocity from CFM and neck size
IBU Rager Calculator
Calculate hop bitterness using the Rager utilization formula
IBU Tinseth Calculator
Calculate International Bitterness Units using the Tinseth formula
India EPF Contribution Calculator
Calculate EPF employee and employer provident fund contributions for Indian payroll.
Inverter Sizing Calculator
Size a solar or battery inverter from continuous load watts plus motor starting surge.
Dual Native ISO Equivalence Calculator
Find equivalent exposures across a camera's dual native ISO base values
Japan Shakai Hoken Calculator
Calculate Japanese health, pension, and employment insurance contributions
Kenya NHIF Contribution Calculator
Calculate Kenyan NHIF monthly health contributions by salary band.
Kenya NSSF Contribution Calculator
Calculate Kenyan NSSF pension contributions under the 2024 NSSF Act.
Layer Height vs Print Quality Analyzer
Compare layer height options against nozzle diameter and print quality
Lens Breathing Compensation for Video
Calculate digital zoom compensation to counteract focus breathing in video
Astrophotography Light Pollution Exposure Calculator
Calculate the optimal sub-exposure for your sky's light pollution
Lighting Circuit Load Calculator
Calculate the number of lighting fixtures per 15 A or 20 A circuit using the 80% continuous-load rule
Visual Limiting Magnitude Calculator
Estimate the faintest visible star with any telescope aperture
LiPo C-Rating & Max Burst Current Calculator
Find safe continuous and burst current limits for any LiPo pack
LiPo Charge Time Calculator
Estimate charge time for any LiPo battery and charger combination
Long Exposure Noise & Hot Pixel Estimator
Predict noise level for long exposures based on sensor temperature and ISO
Lorcana Ink Curve Analyzer
Visualize and optimize your Lorcana ink curve
Malaysia EPF Contribution Calculator
Calculate Malaysian EPF (KWSP) contributions by age and salary band.
All-Grain to Extract Conversion Calculator
Convert all-grain base malt amounts into equivalent DME or LME weights.
Simplified Manual J Heat Load Calculator
Estimate residential heating and cooling loads for equipment sizing room-by-room
Mexico IMSS Contribution Calculator
Calculate Mexican social-security (IMSS) employee and employer shares
Microphone Self-Noise & SNR Calculator
Calculate microphone SNR and minimum detectable SPL from spec-sheet values
Mini-Split Ductless System Sizing Calculator
Size a single-zone or multi-zone ductless mini-split from room areas, climate zone, and construction
Gain Staging Calculator for Mixing
Track signal level and headroom at every stage of your chain
MOA / MIL Scope Adjustment Calculator
Convert bullet impact error to scope clicks in MOA or MRAD.
Motor Disconnect Switch Sizing Calculator
Size motor branch-circuit disconnect switches per NEC 430.109 and 430.110 requirements.
Motor Overload (OL) Heater Sizing Calculator
Size motor overload protection from FLA, service factor, and temperature rating per NEC 430.32.
Motor Starting (LRA) Current Calculator
Estimate locked-rotor amperes and starting kVA for AC induction motors by NEMA code letter.
ND Filter Exposure Calculator
Calculate the long-exposure shutter speed needed with ND filters
NEC 310.16 Full Ampacity Table Lookup
Searchable NEC 310.16 conductor ampacity table for copper and aluminum at 60/75/90 °C
NEC Demand Factor Calculator
Apply NEC Article 220 demand factors to reduce calculated load for services and feeders.
NEC GFCI/AFCI Requirement Checker
Look up 2023 NEC GFCI and AFCI protection requirements by room type and circuit voltage
Net Metering Payback Period Calculator
Estimate solar payback period and 25-year ROI from net-metering credits and system cost
Neutral Conductor Sizing Calculator
Size neutral conductors using NEC 220.61 demand reduction and harmonic-load rules.
Nozzle Material Wear Life Estimator
Estimate brass nozzle wear life from abrasive filament use hours
NPF Rule Star Trail Calculator
Max shutter speed before star trailing with the accurate NPF rule
Off-Grid Load Audit Calculator
Total your daily watt-hours from appliance wattage and runtime for off-grid solar design.
OG/FG/ABV Advanced Calculator
Full original gravity, final gravity, and ABV with attenuation metrics
Beer Freshness Window Calculator
Estimate shelf life and freshness windows by style and packaging method
Panorama Nodal Point Calculator
Find the no-parallax point for stitched panorama photography
Parti-Gyle Gravity Calculator
Split runnings into multiple beers and predict each runnings' gravity
Pathfinder 2e Point Buy Calculator
Build Pathfinder 2e characters with ability boosts and flaws
Pellet to Whole Hop Conversion
Convert hop weights between pellet and whole/plug hop formats
Pet Vaccination Schedule Calculator
Generate a puppy or kitten vaccine and booster schedule
Phantom Power Cable Resistance Drop Calculator
Estimate phantom power voltage drop across XLR cable resistance
Zone System Exposure Calculator
Apply Ansel Adams' Zone System to place tones for black-and-white photography
Full EV Reference Table
Browse all exposure value combinations for ISO 100 across lighting conditions
Water Supply Pipe Sizing Calculator (Hunter's Curve / WSFU)
Size water supply pipes from fixture-unit count using Hunter's Curve and an 8 ft/s velocity limit
Planet Altitude & Azimuth Calculator
Compute a planet's position (alt/az) for any date, time, and location
Plant Watering Interval Calculator
Calculate how often to water based on plant type, pot, and climate
Poland ZUS Contribution Calculator
Calculate Polish ZUS social insurance contributions for employee and employer.
Pet Pool / Paddling Pool Chemistry Calculator
Calculate chlorine and pH adjustment doses for a small pool
Print Cooling Fan Curve Calculator
Map fan percentage to PWM duty cycle for your printer's part-cooling fan
3D Print Time Estimator
Rough print time estimate from object height, layer height, and print speed
Psychrometric Dew Point & Wet Bulb Calculator
Find dew point, wet-bulb temperature, humidity ratio, and enthalpy from dry-bulb and relative humidity
Pump Total Dynamic Head (TDH) Calculator
Calculate total dynamic head from static lift, friction, and velocity head
RC Aircraft Wing Loading Calculator
Calculate wing loading and a stall-speed estimate for RC planes
Receptacle Circuit Count Calculator
Calculate the minimum 20 A small-appliance and dedicated dwelling circuits required by NEC 210.11
Film Reciprocity Failure Calculator
Correct long-exposure times for reciprocity failure on common film stocks
Reef Calcium Dosing Calculator
Calculate daily calcium, alkalinity, and magnesium dosing for reef tanks
Refractometer FG Correction Calculator
Convert refractometer Brix readings to true final gravity after fermentation.
Refrigerant Charge (Subcooling Method) Calculator
Verify TXV-system charge from liquid-line subcooling against the manufacturer target
Refrigerant Oil Charge Calculator (Line Set Extension)
Calculate extra compressor oil needed when extending line sets beyond factory specification
Residential Optional Load Calculation (NEC 220.82)
Fast residential service sizing using the NEC 220.82 optional calculation method
Resin Exposure Time Calculator
Get starting base and normal layer exposure times for SLA/MSLA resin
Reverb Room Size to Pre-Delay Calculator
Derive natural pre-delay from simulated room size and listener position
Room Mode (Standing Wave) Calculator
Find axial, tangential, and oblique room modes for acoustic treatment.
Seed Germination Rate & Sowing Density Calculator
Calculate seeds to sow for a target plant stand given germination rate
Garden Seed Spacing & Row Calculator
Calculate how many plants fit in your garden bed by spacing
Septic Tank Sizing Calculator
Size a residential septic tank from bedroom count using standard daily-flow design tables.
Service Entrance Conductor Sizing Calculator
Size service entrance conductors from a calculated service load per NEC 230.42 and 310.12
Service Load Calculation (NEC 220)
Compute residential service load per NEC 220.82 optional dwelling-unit method
Short-Circuit Current Rating (SCCR) Calculator
Find available fault current at any point in a distribution system for SCCR and AIC verification
Shotgun Shot String & Pattern Calculator
Evaluate shotgun pattern density and pellet count at range
Singapore CPF Contribution Calculator
Calculate Singapore CPF contributions by age band, with the OA/SA/MA split.
Single-Phase Panel Load Balancing Calculator
Balance circuit loads across panel legs to minimize neutral current and optimize panel capacity.
Drain Pipe Slope / Fall Calculator
Calculate fall in inches over a run for 1/8, 1/4, or 1/2 inch per foot drain slopes
Solar DC Cable Sizing Calculator (NEC 690.8)
Size PV DC conductors per NEC 690.8 ampacity and check voltage drop on string runs.
Off-Grid Solar System Calculator
Size solar panels, batteries, and inverter for any off-grid system
Solar PV System Sizing Calculator
Estimate how many solar panels you need to cover your energy consumption.
Solar Water Heating System Sizing Calculator
Size solar collector area and storage volume for a domestic solar hot water system.
Solunar Feeding Times Calculator
Calculate major and minor solunar feeding periods for any date and location.
Spain Seguridad Social Contribution Calculator
Split Spanish Social Security between employee and employer
SRM Beer Color Calculator (Daniels)
Estimate beer color using Ray Daniels' MCU-based formula
SRM Beer Color Calculator (Morey)
Predict beer color in SRM and EBC using the Morey equation
Stamp Condition Grade Reference
Compare philatelic grade descriptions (P, F, VF, XF, Superb) for stamps
500 Rule & NPF Star Trail Calculator
Find the longest exposure before stars trail, for any focal length
Step Mash Infusion Calculator
Calculate the boiling-water volume to add for each step mash temperature rest.
Photography Stop Calculator
Find the EV stops between two aperture, shutter speed, or ISO values
Studio Monitor Placement Calculator
Find the ideal monitor distance, angle and position for your room
Subpanel Sizing Calculator
Determine subpanel ampacity, feeder wire, and breaker size from your circuit load list.
Sunny-16 Exposure Rule Calculator
Apply the Sunny-16 rule to find exposure settings in any lighting condition
Superheat Calculator (Fixed-Orifice Systems)
Find suction-line superheat from suction pressure and temperature to set the charge
Surge Protective Device (SPD) Sizing Calculator
Select SPD type, MCOV, and discharge current for service-entrance and branch use.
Knit Sweater Sizing Calculator
Calculate stitch counts and sleeve lengths for a custom-fit sweater
Sweden Social Security (Arbetsgivaravgift) Calculator
Calculate Swedish employer social contribution rates by age group
Swing & Groove Timing Calculator
Calculate note timing shifts for swing, shuffle, and groove feels
TCG Swiss Tournament Round Calculator
Calculate number of Swiss rounds needed for a TCG tournament
Simplified Tide Height Calculator
Estimate tide height between high and low water using the Rule of Twelfths.
Top/Bottom Layer Count to Thickness
Convert top and bottom solid layer counts into total thickness in mm
Trolling Depth Calculator
Estimate lure depth for lead core or braided trolling line
UK Statutory Redundancy Pay Calculator
Calculate UK statutory redundancy entitlement by age and length of service.
UK Statutory Maternity Pay Calculator
Calculate SMP weekly amounts across the 39-week statutory entitlement.
US Social Security Benefit Estimator
Estimate monthly Social Security retirement benefit from earnings
Vent Pipe Sizing Calculator (IPC 906)
Size vents from connected drainage fixture units and developed vent length per IPC Table 906.1.
Video Bitrate & Storage Calculator
Estimate video file size from bitrate, frame rate and duration
Wargame Charge Range & Reach Calculator
Find reliable charge range and reach for a 2D6 wargame unit
Warhammer 40K Army Points Calculator
Build and tally Warhammer 40K army lists within points limits
Warhammer Kill Team Points Calculator
Build Kill Team rosters and stay within your point limit
Warping Risk Assessor
Assess warping risk for a print based on material, geometry, and settings
Brewing Water Chemistry Calculator
Calculate salt additions to hit target water ion profiles
Residual Alkalinity Calculator for Brewing
Calculate residual alkalinity to predict mash pH direction
Water Treatment Equipment Flow Rate Calculator
Size water softeners, filters, and RO systems from daily demand and peak flow rate.
Watts to Amps Calculator
Convert load watts to amps given voltage and power factor for any phase configuration
Wildlife Track & Gait Spacing Reference
Identify animal gait patterns from track spacing measurements
Wind Drift Calculator for Rifle Shooting
Calculate wind deflection for any bullet at distance
Wire Ampacity Calculator (NEC 310.16)
Look up conductor ampacity from the NEC 310.16 table by AWG/kcmil and insulation type
Wort Chiller Cooling Time Estimator
Estimate how long it takes to chill wort to pitching temperature
Z-Offset First Layer Calculator
Calculate Z offset adjustment from first-layer squish measurements.
Alveolar-Arterial (A-a) Gradient Calculator
Assess pulmonary gas exchange from ABG and FiO2
Paracetamol Toxicity Nomogram (Rumack-Matthew)
Plot serum paracetamol level vs time to guide NAC treatment
ADA / Section 508 Accessibility Checklist
Interactive checklist for US federal and commercial accessibility law
Agricultural Water Quality Compliance Checker
Check setback distances and application windows for nutrient management plan compliance
EU AI Act Conformity Assessment Pathway
Map the conformity assessment route required for your high-risk AI system
AI Liability Risk Scorer (EU AI Liability Directive)
Estimate civil liability exposure under the proposed EU AI Liability Directive
AI Model Training Carbon Estimator
Estimate the CO2e of training a machine-learning model from hardware, time, and grid intensity
AI Training Data Rights Checker
Check if using a dataset for AI training is lawful under copyright and data-protection law
Air Cargo Revenue Tonne-Kilometre Calculator
Calculate RTK, ATK, and load factor for air cargo performance benchmarking
Algorithmic Bias Self-Audit Tool
Self-audit an AI decision-making system for bias risk across protected characteristics.
Aminoglycoside Extended-Interval Dosing Nomogram
Tobramycin and amikacin once-daily dosing from patient kidney function
AMM Price Impact Calculator
Calculate price impact for large trades on constant-product AMMs
Sill Plate Anchor Bolt Layout Calculator
Calculate anchor bolt count, spacing, and edge distances per IRC rules
Anchor Scope & Chain Calculator
Calculate required anchor chain scope for safe holding in any depth and conditions
Anaesthetic Gas Flow Rate Calculator
Calculate fresh gas flow and volatile agent consumption for inhalation anaesthesia
Antibiotic PK/PD Target Attainment Calculator
Predict fT>MIC, AUC/MIC, or Cmax/MIC for time- or conc-dependent antibiotics
Antibiotic MIC Breakpoint Interpreter (EUCAST/CLSI)
Classify S, I, or R from an MIC using breakpoint tables
APACHE II Score Calculator
ICU severity of illness and mortality estimation
Argentina IVA Calculator
Calculate Argentine IVA at 21% / 10.5% / 27% by category — instant in your browser.
Australia Annual Leave Entitlement Calculator
Calculate Australian 4-weeks minimum annual leave with shift-worker rules
Australia Concessional Contributions Cap Checker
Check your Australian concessional super cap and catch-up room
Australia Government Parental Leave Pay Calculator
Calculate Australian government-funded parental leave pay (DGEPP)
Australia Sole Trader Tax Calculator
Calculate Australian ABN-holder income tax, Medicare levy and LITO offset
Australia Public Holiday Counter
Count Australian working days excluding state-specific public holidays
Aviation Fuel Reserve Calculator (VFR/IFR)
Calculate trip, alternate, and 45-minute reserve fuel per FAR 91.151/91.167
Aviation Noise Exposure Reference Tool
Look up aircraft noise category, EPNdB limits, and Stage/Chapter classification
Ballast Calculation Tool
Find the ballast water mass needed to reach a target draft after discharge
Simple Beam Load & Deflection Calculator
Calculate max bending moment, shear force, and mid-span deflection for beams
Beaufort Scale Wind & Sea State Reference
Convert Beaufort force to wind speed, wave height, and sea-state description
Bee Colony Honey Yield Estimator
Estimate seasonal honey yield from colony strength, forage area, and nectar flow
Bicarbonate Deficit Calculator
Estimate total bicarbonate replacement in metabolic acidosis
Billable Hours Calculator
Convert time entries to billable fees at multiple rate tiers in seconds
Biometric Data Processing Impact Checker
Check lawfulness and safeguard requirements for biometric data under GDPR
Bishop Score for Labour Induction
Cervical readiness score to predict induction success
Solidity Gas Limit Estimator
Estimate gas for common EVM operations and Solidity patterns
Board Feet Calculator
Calculate board feet from thickness, width, and length in seconds
Boring Bar Deflection Calculator
Estimate boring bar tip deflection under cutting force for overhang ratios
Brazil Férias (Annual Leave) Calculator
Calculate Brazilian CLT vacation entitlement plus the one-third constitutional bonus.
Brazil Public Holiday Counter
Count Brazilian working days excluding national and state holidays
Brazil Rescisão Trabalhista Calculator
Estimate a CLT termination payout — saldo, férias, 13° and the FGTS fine.
Bitcoin Difficulty & Block Time Estimator
Estimate the next difficulty adjustment from the current hashrate trend
Cable Tray Fill Calculator (NEC 392)
Verify cable tray fill area for single and multiconductor cables per NEC Article 392.
Calcium–Phosphorus Product Calculator
CKD cardiovascular risk from Ca x P product in dialysis patients
Canada EI Premium Calculator
Calculate Canadian Employment Insurance premiums for employee and employer
Canada Public Holiday Counter
Count Canadian working days by province (provincial holidays vary)
Canada RRSP Contribution Room Calculator
Work out your RRSP deduction limit from earned income
Canada Self-Employed Tax Calculator
Calculate Canadian sole-proprietor federal plus provincial tax and CPP
Canada Termination Notice Calculator
Calculate statutory minimum termination notice by Canadian province and length of service.
Car Commute Carbon Calculator
Calculate annual CO2 from your daily commute by car or public transport
Carbon Inset vs Offset Decision Tool
Decide whether value-chain insetting or market offsetting fits your strategy
Carbon Offset Cost Calculator
Calculate the cost to offset your carbon footprint at multiple market tiers
Freight Carbon Footprint & Offset Calculator
Calculate CO2e emissions per tonne-km for road, rail, sea, and air freight
Carboplatin AUC Dose Calculator (Calvert Formula)
Oncology carboplatin dose from a target AUC and GFR
Cargo Insurance Premium Estimator
Estimate marine cargo insurance premium from commodity, value, and voyage
Cargo Theft & Loss Recovery Calculator
Estimate cargo claim recovery after deductibles, depreciation, and carrier liability caps
CBAM Carbon Cost Estimator
Estimate EU Carbon Border Adjustment Mechanism costs on imports
CBAM Certificate Quantity & Cost Planner
Plan CBAM certificate purchases and cost for your import declaration
CBDC vs Crypto vs Stablecoin Comparison Tool
Compare central bank digital currencies, stablecoins, and crypto on key risk dimensions
CE Marking Decision Tree
Find the right CE directives and conformity route for your product.
Cell Density from OD600 Calculator
Convert absorbance at 600 nm to cells/mL or CFU/mL
Cell Viability Calculator (Trypan Blue Exclusion)
Calculate live cell count and viability % from haemocytometer data
Cell Doubling Time Calculator
Calculate population doubling time from two cell counts
Center Drill Depth Calculator
Calculate center-drill plunge depth to create the correct 60-degree center
CHA₂DS₂-VASc Score Calculator
Stroke risk in atrial fibrillation for anticoagulation decisions
CHADS₂ Stroke Risk Score
Original stroke risk tool for AF patients
Charter Party Freight Calculator
Calculate voyage freight, laytime, and despatch or demurrage from CP terms
Child-Pugh Score Calculator
Cirrhosis severity classification A, B, or C
Child Support Estimator by State
Estimate monthly child-support obligations using income-shares or percentage models
Chile IVA Calculator
Add or extract Chile's flat 19% IVA — instant result in your browser.
China Public Holiday Counter
Count Chinese working days with Golden Week and day-swap adjustments
Chip Load Calculator
Back-calculate chip load per tooth from measured feed rate
Circular Economy Maturity Assessment
Assess your company's circular economy maturity across design, use, and recovery
Civil Damages Calculator
Tally economic, non-economic, and punitive damages for a civil claim
Climate Risk TCFD Screener
Screen physical and transition climate risks for TCFD disclosure
Cloud Base Calculator
Estimate convective cloud base from surface temperature and dew point spread
Codon to Amino Acid Translator
Translate a DNA or RNA codon sequence into its amino acid sequence
Collet Runout Tolerance Calculator
Estimate total indicator runout (TIR) at the tool tip from collet specs
Colombia IVA Calculator
Calculate Colombian IVA at 19% / 5% / 0% by product category — runs in your browser.
Combustion Air Opening Size Calculator (IMC 701)
Size combustion air openings for fuel-burning equipment rooms per IMC 701
Commercial Lease Rent Escalation Calculator
Project total rent over a lease term with fixed or CPI-style escalations
Container Lashing Force Calculator
Calculate lashing forces on deck containers using ship motion and stow geometry
Container Load Planner (20ft/40ft/TEU)
Estimate how many pallets or cartons fit into a 20ft, 40ft, or HC container
Container Stuffing & Utilisation Calculator
Maximise CBM utilisation and check weight limits for container loading
Contingency Fee Calculator
Calculate attorney fees, costs, and net-to-client on contingency cases
Contract Notice Period Calculator
Compute contractual notice expiry dates for termination or renewal clauses
Cookie Consent Compliance Checker
Check your cookie banner against GDPR, ePrivacy, and ICO guidance
Copyright Term Calculator
Determine whether a US work is still in copyright or in the public domain
CS3D / CSDDD Applicability Checker
Check if your company is in scope for the EU Corporate Sustainability Due Diligence Directive
Potassium Shift Calculator (pH Correction)
Estimate true potassium after correcting for blood pH
Corrected Sodium for Hyperglycaemia
Adjust measured serum sodium for elevated blood glucose
Countersink Depth Calculator
Find countersink depth for any screw head diameter and countersink angle
Court Deadline Calculator
Count calendar or business days to compute litigation deadlines accurately
CrCl-Based Renal Drug Dosing Interval Selector
Renal dose reduction guidance for common drugs
Crop Insurance Premium Estimator
Estimate federal crop insurance premium for APH and revenue protection plans
Crop Rotation Nitrogen Credit Calculator
Estimate nitrogen credit from a previous legume crop to cut fertilizer needs
Crosswind & Headwind Component Calculator
Resolve wind into headwind and crosswind components for any runway
Crypto Collateral Swap & Refinancing Cost Calculator
Calculate the all-in cost of swapping collateral in a DeFi lending position.
Crypto DCA Backtest Tool (Manual Data)
Backtest a dollar-cost averaging strategy with manually entered price history
Crypto DCA Target Price Calculator
Calculate how many DCA purchases reach your target average cost basis
Crypto Futures PnL Calculator
Calculate realised P&L on a closed long or short futures position
Crypto Estate & Inheritance Planning Checklist
Generate a personalised crypto asset inheritance checklist for estate planning.
Crypto Portfolio Diversification Scorer
Score your crypto portfolio's diversification across asset types and correlation
Crypto Position Size & Risk Calculator
Calculate position size from account risk, entry, and stop-loss
Crypto Tax Lot Calculator (FIFO / LIFO / HIFO)
Calculate capital gains/losses from crypto disposals using FIFO, LIFO, or HIFO
Crypto Tax Treatment by Jurisdiction
Look up crypto capital gains, income, and mining tax rules for 40 countries
Crypto Wash Sale Rule Tracker (US / UK)
Track potential wash-sale or bed-and-breakfasting patterns in your crypto trades
CSF Analysis Interpreter
Classify CSF results across bacterial, viral, fungal and TB meningitis
CSRD / ESG Reporting Checklist
Interactive CSRD double-materiality and ESRS disclosure checklist
CURB-65 Pneumonia Severity Score
Stratify community-acquired pneumonia for admit vs discharge
Customs Broker Fee Estimator
Estimate US customs brokerage fees by entry type, value, and services
EU Cyber Resilience Act (CRA) Applicability Checker
Check CRA obligations for hardware/software products with digital elements
CNC Machining Cycle Time Estimator
Estimate rough CNC cycle time from toolpath length, feed rate, and rapids
EU Data Act Applicability Checker
Determine data-sharing obligations under the EU Data Act for IoT/connected products
Data Centre PUE & Carbon Calculator
Calculate PUE efficiency and CO2 footprint for your data centre or server room
DeFi Protocol Rug Pull Risk Scorer
Score a DeFi project's rug-pull risk from on-chain and structural indicators
DeFi Yield Farming Tax Liability Estimator
Estimate income tax on DeFi yield from lending, liquidity provision, and farming
DeFi Yield Optimizer Comparison
Compare DeFi strategy yields: lending, LPing, staking, vault strategies
Denmark Grøn Check / Grønt Bidrag Calculator
Calculate the Danish green tax credit for low and middle incomes
Denmark MOMS Calculator (flat 25%)
Calculate Danish 25% MOMS inclusive and exclusive in one step.
Density Altitude Calculator
Find density altitude from pressure altitude, temperature, and dew point
Diet & Food Carbon Footprint Calculator
Estimate annual CO2e from your diet — meat, dairy, plant-based
Digital Product Passport Readiness Checker
Assess readiness for the EU Digital Product Passport under Ecodesign (ESPR)
Distance to Horizon Calculator
Find geometric, refraction-corrected, and radar horizon distance from eye height
Dividing Head Calculator
Find the hole circle and turns for 40:1 simple indexing
DKA IV Fluid Regime Calculator
Calculate DKA fluid replacement and potassium supplementation volumes
DMA Gatekeeper Test
Check if your platform meets EU Digital Markets Act gatekeeper thresholds.
DNA/RNA Quantitation by Absorbance (A260) Calculator
Convert an A260 reading to ng/uL for DNA, RNA, or oligos
Document Redaction Cost Estimator
Estimate attorney-hours and cost to redact a document set for production
Water Heater Recovery Rate Calculator
Calculate recovery time and recovery rate for storage water heaters from element kW or gas BTU/h.
DORA ICT Risk Applicability Checker
Find your ICT risk duties under the EU Digital Operational Resilience Act
Data Transfer Mechanism Selector (GDPR / UK GDPR)
Choose the right cross-border data transfer mechanism under GDPR or UK GDPR
DPIA Helper — Data Protection Impact Assessment
Determine if a DPIA is required and scaffold the assessment under GDPR
Draft Survey Calculator
Calculate cargo loaded or discharged from six-point draft readings
Drain Cleanout Spacing & Location Calculator
Verify IPC cleanout requirements by pipe size and placement for horizontal and building drains.
Drill Feed & RPM per Material Calculator
Recommend drilling RPM and feed per revolution for any material and drill size
DSA Applicability Checker
Determine your Digital Services Act tier: hosting, intermediary or VLOP.
EU Accessibility Act (EAA) Applicability Checker
Determine if your product or service must comply with the EAA
Earthwork Swell & Shrinkage Calculator
Convert bank, loose, and compacted soil volumes using swell and shrinkage
EIP-1559 Transaction Fee Calculator
Calculate Ethereum EIP-1559 effective gas price, max fee, and miner tip
Embodied Carbon Calculator (Building Materials)
Estimate CO2e from construction materials: concrete, steel, timber, insulation
Environmental Permit Requirement Checker (UK/EU)
Find out if your business activity needs an environmental permit
Economic Order Quantity (EOQ) Calculator
Find the optimal order quantity that minimises total inventory holding and ordering cost
Extended Producer Responsibility Fee Estimator
Estimate EPR packaging fees across UK and EU markets by material and tonnage.
ePrivacy Regulation Readiness Checker
Assess your cookie and tracking setup against the forthcoming EU ePrivacy Regulation
EU AI Act Risk Classifier
Classify your AI system's risk tier under the EU AI Act
EU Carbon Removal Certification (CRCF) Eligibility Checker
Check if your carbon removal activity qualifies under the EU CRCF framework
EU Ecolabel Eligibility Checker
Check if your product or service category is eligible for the EU Ecolabel
SFDR Product Classification Checker
Classify a fund as Article 6, 8, or 9 under the EU SFDR
EU Taxonomy Eligibility & Alignment Checker
Check if your economic activity qualifies as environmentally sustainable under EU Taxonomy
EU Public Holiday Counter
Count working days between dates for any EU27 country
EU Deforestation Regulation (EUDR) Checker
Check if your commodities fall under the EU deforestation due-diligence rules
EV Range & Efficiency Calculator
Estimate electric vehicle range from battery capacity, efficiency, and conditions
EV vs Petrol Lifetime CO2 & Cost Comparator
Compare lifetime emissions and cost: electric vs petrol or diesel car
Eviction Timeline Estimator
Map out required notice, filing, hearing, and lockout dates by US state
Hydronic Expansion Tank Sizing Calculator
Size a closed hydronic expansion tank from system volume, pressure, and temperature range.
Morse Fall Risk Scale Calculator
Six-item inpatient fall risk assessment tool
Fascia, Soffit & Eave Material Calculator
Estimate fascia board, soffit panel area, and J-channel for any roof perimeter
F-Gas Quota & HFC Phase-Down Calculator
Calculate F-gas CO2-equivalent and check EU quota phase-down position
Fillet Weld Size & Strength Calculator
Calculate the required fillet weld leg size to carry a given shear or tensile load
Fillet Weld Effective Throat Calculator
Calculate effective and theoretical throat size from leg size for any weld profile
Flight Carbon Footprint Calculator
Calculate CO2e emissions for any flight with radiative forcing
Flight Plan Fuel Summary Calculator
Summarize multi-leg fuel burn, reserves, and total required fuel for a flight plan
Floor Joist Span Calculator
Verify allowable floor joist span for lumber size, species, and live load
24-Hour Fluid Balance Calculator
Tally ins and outs for daily net fluid balance on the ward.
Footing Size Calculator
Calculate minimum footing area and depth from column load and soil bearing capacity
France Auto-Entrepreneur Charges Calculator
Calculate French micro-entrepreneur cotisations sociales and IR prélèvement libératoire
France CESU Déclaré Tax Credit Calculator
Calculate the French 50% tax credit for declared home-service workers
France Congé Paternité Calculator
Calculate French paternity/co-parent leave days and IJSS indemnity
France Congés Payés Calculator
Calculate French paid leave entitlement (5 weeks) and acquisition month
France PER (Plan d'Épargne Retraite) Deduction Ceiling Calculator
Calculate your French PER maximum deductible contribution (plafond)
Franchise Royalty & Fee Calculator
Calculate monthly franchise royalties, ad-fund contributions, and net-to-franchisee
Freight Class (NMFC) Calculator
Determine LTL freight class from density, stowability, handling, and liability
Aircraft Fuel Burn & Endurance Calculator
Calculate endurance, range, and reserve fuel from burn rate and usable fuel
Fuel Cost vs CO2 Comparator
Compare petrol, diesel, LPG, and EV on cost and CO2 per mile
Fuel Oil Storage Tank Sizing Calculator
Size a No. 2 fuel oil storage tank from boiler BTU/h and heating degree days.
Freight Fuel Surcharge Calculator
Calculate carrier fuel surcharges from base rate and published FSC percentage
Crypto Funding Rate Cost Calculator
Calculate the annualised cost of holding a perpetual futures position
Boiler Replacement Sizing Calculator
Size a replacement hot-water boiler from Manual J heat loss or connected radiation.
Gas Appliance Combustion Efficiency Calculator
Estimate stack efficiency from flue gas O₂ or CO₂ and temperature (Siegert)
Natural Gas / Propane Pipe Sizing Calculator
Size black iron or CSST gas supply piping from total BTU/h demand per NFPA 54 longest-length method.
Gas Safety Compliance Checker (UK Landlord)
Check UK landlord gas safety duties under the Gas Safety Regulations 1998
GC Content Calculator
Calculate GC percentage and base composition for any nucleotide sequence
Trade Intensity & Export Revenue Estimator
Estimate export revenue potential by market using GDP per capita and trade intensity
GDPR Fine Estimator
Estimate potential GDPR penalty range using Article 83 tier and annual revenue
Gentamicin Once-Daily Dosing Calculator
Hartmann nomogram-based extended-interval aminoglycoside dosing
Germany Annual Leave Entitlement Calculator
Calculate German Mindesturlaub and contractual vacation days
Germany Elterngeld Calculator
Calculate German parental benefit (Basiselterngeld / ElterngeldPlus)
Germany Freiberufler Tax Calculator
Calculate German self-employed income tax, Soli and church tax on your Gewinn
Germany Haushaltsnahe Dienstleistungen Tax Credit Calculator
Calculate the German §35a household-services tax credit (20% of labour cost)
Germany Kurzarbeitergeld Calculator
Calculate German short-time work (KUG) benefit amount
Germany Riester Rente Contribution Calculator
Calculate minimum Riester contribution for full state allowance (Zulage)
Glasgow Coma Scale (GCS) Calculator
Score eye, verbal, and motor responses for consciousness level
Glide Distance Calculator
Calculate engine-out glide range and time aloft from height and glide ratio
Global Plastics Treaty Readiness Checker
Assess your plastic product strategy against the proposed UN Plastics Treaty
GRACE ACS Outcome Score
In-hospital and 6-month mortality risk in ACS
Grain Shrink & Drying Cost Calculator
Calculate shrink weight loss and drying cost to reach standard moisture
Grease Trap / Interceptor Sizing Calculator
Size a hydromechanical grease interceptor by fixture-unit flow rate per IAPMO Z1001.
Green Lease Clause Scorer
Score a commercial lease against green lease best-practice clauses
Greenwashing Risk Scorer
Score your sustainability claims for greenwashing risk under the EU Green Claims Directive
Greywater Reuse System Sizing Calculator
Estimate daily greywater supply and size a storage tank for toilet flushing or irrigation reuse.
IGF-1 Standard Deviation Score Calculator
Compute IGF-1 SDS from age- and sex-specific reference ranges
GZ Stability Curve Basic Estimator
Estimate righting lever GZ values and metacentric height from simplified ship inputs
Hardness Conversion Calculator
Convert between Rockwell C (HRC), Brinell (HB), Vickers (HV), and tensile strength
Harvest Moisture Loss & Shrink Calculator
Calculate actual vs. standard-moisture bushels and moisture-shrink cost at harvest
Smart Contract Security Audit Checklist
Self-audit a Solidity contract against common vulnerability classes
Hazmat / Dangerous Goods Surcharge Estimator
Estimate hazmat surcharges for ground, air, and ocean dangerous goods
HEART Score for Chest Pain
Identify low-risk chest pain for safe ED discharge
Heat Pump COP & HSPF Calculator
Calculate heat pump COP from output and power, and estimate seasonal HSPF
Haematologic Response Criteria Calculator (CR/VGPR/PR)
Classify myeloma treatment response by IMWG criteria
Herbicide / Pesticide Tank Mix Calculator
Calculate product volume per tank and per acre from label rate and field size
HIPAA Compliance Checklist
Interactive HIPAA Security Rule and Privacy Rule gap assessment
Holliday-Segar Fluid Maintenance Calculator
Maintenance IV fluid rate for paediatric and adult patients
Hong Kong MPF Contribution Calculator
Calculate Mandatory Provident Fund contributions, 5 percent each, capped
HS Code & Duty Helper
Look up HS-code chapter/heading and indicative duty rates by commodity
Human Rights Due Diligence Checker (UNGPs)
Self-assess supply-chain human rights due diligence against the UNGPs
Whole-House Dehumidifier Sizing Calculator
Size a whole-house dehumidifier from latent moisture load and infiltration
Ductwork Heat Gain / Loss Calculator
Estimate BTU/h heat gain or loss from supply and return ducts in unconditioned spaces.
Heat Exchanger NTU-Effectiveness Calculator
Find heat exchanger effectiveness and outlet temperatures with the ε-NTU method.
HVAC Cooling & Heating Load Estimator (Manual J Simplified)
Estimate BTU/h heating and cooling loads from room area and envelope
Refrigerant GWP & EPA Section 608 Quantity Calculator
Calculate annual leak rate and the EPA-required repair trigger from system charge weight.
HVAC Zoning System Load & Bypass Calculator
Size a bypass damper for a zoned forced-air system and verify minimum zone flow
Hydronic Circulater Pump Selection Calculator
Get system GPM and head loss to select a residential hydronic zone circulator
IATA Live Animal Regulations Quick Reference
Look up container type, ventilation, and document requirements for air live-animal shipments
Industrial IoT Cybersecurity Risk Checker (IEC 62443)
Assess ICS and OT system cyber risk against IEC 62443 security levels
Impermanent Loss Calculator
Calculate impermanent loss for AMM liquidity pool positions
Incoterms 2020 Selector & Reference
Choose the right Incoterm and see risk-transfer, cost, and clearance rules
India Earned Leave Calculator
Calculate Indian statutory earned leave under the Factories Act or a state Shops Act.
India Gratuity Calculator
Calculate Payment of Gratuity Act entitlement with the 15/26 formula and ₹20 lakh cap.
Indonesia PPN Calculator
Add or extract Indonesia's 11% PPN — instant result in your browser.
INR Reversal — FFP or PCC Dose Calculator
Calculate FFP units or PCC dose to reverse an elevated INR
Insulin Sliding Scale & Drip Rate Calculator
Build a correction scale and convert insulin units/hr to a pump rate
Internal Carbon Price (ICP) Impact Calculator
Model the P&L impact of an internal carbon price across business units
International Freight Cost Estimator
Estimate door-to-door import cost including freight, duty, VAT, and fees
Ionised Calcium Estimator from Total Calcium and pH
Estimate ionised Ca when direct measurement is unavailable
Ireland Universal Social Charge (USC) Calculator
Calculate Irish USC across the four income bands
ISO Tolerance & Fit Calculator
Find hole and shaft limits for any ISO fit class and nominal diameter
ISO 14001:2015 Environmental Management Gap Checker
Self-assess ISO 14001 EMS readiness before certification
ISO 27001:2022 Gap Checker
Identify ISO 27001 Annex A control gaps before certification
Israel Bituach Leumi Contribution Calculator
Calculate Israeli national insurance and health tax at reduced and full rates.
IV Solution Tonicity & Compatibility Estimator
Check tonicity of compounded IV admixtures before infusion
IV Drip Rate Calculator
Compute drops/min or mL/hr for any IV infusion setup
Japan Childcare Leave (育児休業) Benefit Calculator
Calculate Japanese 育児休業給付金 (childcare leave benefit) during parental leave
Japan Working Day Counter
Count Japanese working days excluding 国民の祝日 and substitute holidays
Jury Duty Pay Calculator
Calculate total jury pay, employer supplement, and income gap for any US state
Kleihauer-Betke Feto-Maternal Haemorrhage Estimator
Estimate feto-maternal bleed volume and anti-D dose
Knurling RPM & Feed Calculator
Calculate spindle speed and feed for clean straight or diamond knurling
Lactate Clearance Calculator
Percentage lactate clearance as a sepsis resuscitation endpoint
Landed Cost Calculator
Calculate total landed cost per unit including CIF, duty, tax, and fees
Lathe Taper Calculator
Calculate compound-slide angle or tailstock offset for any taper
Simplified LCA Hotspot Identifier
Identify the top carbon and energy hotspots across a product's lifecycle
Lease Break Penalty Calculator
Calculate lease-termination penalties, re-letting fees, and landlord duty to mitigate
Lighting Power Density (LPD) Calculator
Calculate installed lighting power density in W/ft² and compare against ASHRAE 90.1 limits.
Liquidity Pool Position Value Calculator
Track current value and fee income of a Uniswap V2 LP position
LLC Dissolution Asset Distribution Calculator
Compute member distributions after paying LLC debts and liquidation costs
LPG / Propane Conversion & Sizing Calculator
Convert propane BTU to gallons, size a storage tank, and check orifice sizing vs natural gas.
LTL vs. FTL Decision Tool
Compare cost-per-cwt for LTL and FTL to find the break-even shipment size
Mach Number Calculator
Convert between true airspeed and Mach number at any air temperature
Manure Application Rate Calculator
Calculate manure nutrient loading and required application rate for crop nutrient needs
Crypto Licence Jurisdiction Checker
See which jurisdictions require a licence for your crypto-asset service
Masonry Lintel Load Calculator
Find the load on a CMU or brick lintel over an opening using 45-degree arching
Maximum Allowable Blood Loss (MABL) Calculator
Perioperative transfusion trigger from blood volume and target Hb
Mediation Settlement Range Tool
Calculate a realistic settlement range using expected value and BATNA analysis
10× Medication Error Detection — Dose Plausibility Checker
Flag 10-fold dosing errors by checking calculated dose against safe range
MELD & MELD-Na Score Calculator
Liver disease severity and transplant waitlist priority score
Winter's Formula — Expected pCO2 in Metabolic Acidosis
Detect superimposed respiratory disorders in metabolic acidosis
METAR Decoder
Parse and translate a raw METAR weather report into plain English
Mexico Liquidación Laboral Calculator
Calculate Mexican LFT severance: 3 months + 20 days/year + seniority premium
Mexico Public Holiday Counter
Count Mexican working days excluding mandatory Días de Descanso Obligatorio
MiCA Crypto-Asset Classification Tool
Classify your token under the EU Markets in Crypto-Assets Regulation
Microgrid Load Shedding Priority Calculator
Assign load-shedding priority tiers to circuits and find generator or battery runtime per tier.
MiFID II Retail Investor Suitability Self-Assessment
Self-assess your risk profile against MiFID II suitability criteria
MIG Wire Diameter Selector
Pick the right wire diameter for any MIG welding application and material thickness
Modern Slavery Statement Builder
Build a UK Modern Slavery Act compliant statement in minutes
Mortise & Tenon Sizing Calculator
Calculate tenon thickness, length, and cheek-glue area for structural joints
Nature-Positive Risk Screener (TNFD)
Screen business activities for nature-related dependencies and impacts (TNFD LEAP)
NEC Tap Rule Calculator (210% and 100 A Rules)
Check NEC 240.21 tap rules for 10-ft, 25-ft, and outside feeder taps
Multifamily Dwelling Load Calculation (NEC 220.84)
Size service for apartment buildings using NEC 220.84 optional demand factors
NEC Article 430 Motor Circuit Summary Calculator
Get FLC, conductor, max OCPD, overload, and disconnect for a motor in one step.
NEC Kitchen Circuit Requirements Calculator
List the dedicated kitchen circuits required per NEC 210.52, 210.8, and 210.12
Panel Schedule / Load Center Calculator
Build a load center panel schedule, auto-assign circuits to legs, and compute total demand.
NEC Chapter 9 Table 9 AC Resistance & Reactance Lookup
Look up AC resistance and reactance per 1000 ft by conductor and conduit type
Neonatal Drug Dose Reference Calculator
Weight-based neonatal dosing for antibiotics, caffeine, and NICU drugs
Net Zero Target Pathway Calculator
Build a linear or science-based net zero reduction pathway from base year
New Zealand KiwiSaver Calculator
Calculate NZ KiwiSaver contributions at 3, 4, 6, 8 or 10 percent
NEWS2 Score Calculator
National Early Warning Score 2 for patient deterioration detection
NFT Royalty Calculator
Calculate NFT royalty income across primary and secondary sales
NHTSA Complaints Lookup
Search NHTSA consumer complaints for any vehicle year, make, and model
NHTSA Vehicle Make & Model Lookup
Browse all makes and models in the NHTSA vPIC database without an API key
NHTSA Recall Lookup
Check any vehicle for open NHTSA safety recalls by VIN using the free public API
NHTSA Safety Ratings Lookup
Retrieve 5-Star Safety Ratings for any model year vehicle from NHTSA
Product Liability Classification Checker for Digital Products (EU/UK)
Find out if your digital or connected product carries producer liability
NIS2 Directive Applicability Checker
Determine if your organisation is an essential or important entity under NIS2
Nitrogen Use Efficiency (NUE) Calculator
Calculate NUE percentage from crop uptake and fertilizer applied to optimise N applications
Non-Compete Clause Reasonableness Tool
Assess non-compete enforceability by state using duration, geography, and scope
Ocean Freight Rate Comparison Tool
Compare FCL and LCL all-in costs to find the break-even CBM for your shipment
OECD Pillar Two Global Minimum Tax Calculator
Estimate top-up tax under the OECD Pillar Two 15% global minimum tax.
Crypto Options Greeks Calculator (Black-Scholes)
Calculate delta, gamma, theta, vega, and rho for crypto vanilla options
Arterial Oxygen Content (CaO2) Calculator
Calculate total oxygen content from haemoglobin and SpO2/PaO2
Oxygen Delivery (DO₂) & Consumption (VO₂) Calculator
Haemodynamic oxygen transport indices from cardiac output and Hb.
Packaging Carbon Footprint Calculator
Estimate CO2e for packaging across plastic, glass, paper, and metal
Packaging Recyclability On-Pack Labelling Checker
Check the correct recyclability label for your packaging material
Paddock Rotation Calculator
Calculate rest period, paddock number, and grazing days for rotational grazing
Paediatric Emergency Drug Dose Reference
One-weight-entry lookup for all peds ACLS and RSI drugs.
Paediatric GCS Calculator (Children <2 years)
Age-adapted Glasgow Coma Scale for infants and toddlers
Paediatric Normal Vital Signs Reference
Age-band heart rate, respiratory rate, and BP reference ranges
Pallet Load / Stack Calculator
Calculate cartons per pallet, layers, pallet weight, and stack height for shipping
Parkland Burn Formula — IV Fluid Resuscitation
Calculate 24-hour fluid resuscitation volume for burn injuries
Modified Brooke Formula — Burn Fluid Resuscitation
Alternative lower-volume 24-hour IV fluid calculation for burn injuries
Patent Term Adjustment (PTA) Calculator
Estimate USPTO PTA days under 35 U.S.C. 154(b) A, B, and C delays
PCI DSS Scope Reduction Tool
Determine your PCI DSS SAQ type and cardholder data environment scope
PCR Master Mix Calculator
Scale reagent volumes for any number of PCR reactions
Neonatal PDA Treatment Candidacy Estimator
Score clinical and echo features for PDA intervention decisions
Peru IGV Calculator
Calculate Peru's 18% IGV (16% IGV + 2% IPM) — add or extract in your browser.
Pest Economic Threshold Reference Tool
Look up economic thresholds for common field-crop pests to decide spray or no-spray
Paediatric Early Warning Score (PEWS)
Standardised early deterioration detection in children
PEX vs Copper Flow Rate Comparison Calculator
Compare pressure drop and flow rate between PEX-A, PEX-B, and Type L copper of the same size.
Phenytoin Dose Adjustment for Hypoalbuminaemia
Correct a phenytoin level for low albumin or renal failure.
PV String Sizing Calculator (Panels per String)
Find the min and max solar panels per string for an inverter MPPT window
Pipe Bevel & Saddle Layout Calculator
Generate the wrap-around cut template for pipe saddle and branch joints
Plant Population & Row-Spacing Tool
Calculate plant population per acre from row spacing and in-row seed spacing
Plasmid Insert Size Estimator
Predict gel band sizes from a restriction digest of a recombinant plasmid
Plastic Packaging Tax Calculator
Estimate UK Plastic Packaging Tax liability from weight and recycled content.
Plastic Recyclability & SUP Directive Checker
Check your plastic packaging against the EU Single-Use Plastics Directive
Platelet Transfusion Dose Calculator
Calculate platelet concentrate units needed to reach a target count
PFA-100 Closure Time Result Interpreter
Classify platelet function from PFA-100 collagen-epinephrine and ADP closure times
Plumbing Material Takeoff Calculator
Estimate supply and DWV footage, fittings, and WSFU from fixture counts for bidding.
Pipe Offset / Travel Calculator (Plumbing Isometric)
Calculate pipe cut lengths and travel for 45°, 22.5° and 60° offsets
Plumbing Rough-In Dimensions Reference
Look up standard rough-in heights and offsets for toilets, sinks, tubs, showers, and water heaters.
Water Service Meter Sizing Calculator
Size a domestic water meter from peak-demand WSFU using AWWA M22 guidelines
Plywood Sheet Optimizer
Lay out cut parts on the minimum number of sheets to cut cost and waste
Port Congestion Surcharge Reference
Look up indicative peak-season and port-congestion surcharges by trade lane
Post Base Anchor Sizing Calculator
Select post base size and concrete anchor pattern for uplift and shear loads
Power of Attorney Validity & Expiry Tracker
Track POA effective dates, renewal deadlines, and state-specific durability rules
Total Harmonic Distortion (THD) Calculator
Calculate voltage or current THD from individual harmonic magnitudes
Product Carbon Footprint Estimator
Estimate cradle-to-gate CO2e for a manufactured product
Product Ecodesign Scorecard
Score your product against EU ESPR ecodesign criteria
Pneumonia Severity Index (PSI/PORT) Calculator
Detailed 20-variable pneumonia mortality risk stratifier
QuantiFERON-TB Gold Interpretation Calculator
Apply QIAGEN cutoffs to classify a QFT IGRA result
qPCR Efficiency Calculator from Standard Curve
Calculate PCR efficiency and R-squared from a Ct vs log(template) curve
qSOFA Score Calculator
Quick bedside sepsis screening in three parameters
RBC Transfusion Expected Hb Rise Calculator
Predict post-transfusion haemoglobin from units transfused
REACH / RoHS Substance Checker
Check if your product is restricted under REACH or RoHS substance rules.
Real Estate Cap Rate & NOI Calculator
Calculate NOI, cap rate, and implied value for investment property analysis
Rebar Spacing & Lap Splice Calculator
Find bar spacing and required lap-splice length per ACI 318
Recycling Rate Estimator
Estimate your household or business recycling rate and CO2 savings
ReFi Tokenised Carbon Credit Equivalence Calculator
Compare traditional vs tokenised carbon credit pricing, verification, and retirement
Reefer / Refrigerated Cargo Cost Estimator
Estimate reefer premium and pre-trip inspection fees for perishable cargo
Reorder Point Calculator
Find the on-hand level that should trigger a replenishment order
Residential Mechanical Ventilation Calculator (ASHRAE 62.2)
Calculate whole-house ventilation CFM per ASHRAE 62.2 and IECC 2021
Retaining Wall Block Count Calculator
Estimate blocks, deadman count, and drainage stone for any retaining wall
Reticulocyte Production Index (RPI) Calculator
Determine if anaemia is hypoproliferative or hyperproliferative
Revised Trauma Score (RTS) Calculator
Physiologic trauma severity for triage and survival prediction
Right-to-Repair Product Scorer
Score your product's repairability against EU and UK rules
RPM / SFM Calculator
Convert between spindle RPM and surface feet per minute for any cutter diameter
RSI Drug Dosing Calculator
Rapid sequence intubation pre-medication, induction and paralytic doses.
Safety Stock Calculator
Set buffer inventory from demand variability, lead time, and service level
SCC Transfer Impact Assessment Tool
Assess third-country transfer risk for GDPR Standard Contractual Clauses
Scope 1 / 2 / 3 GHG Emissions Estimator
Estimate your company's GHG inventory across all three scopes
Scope 2 Market-Based vs Location-Based Emissions Comparator
Compare Scope 2 emissions under the market-based and location-based methods
Seed Cost Per Acre Calculator
Calculate seed cost per acre and per bushel of yield from bag price and seeding rate
Shear Pin Design Calculator
Calculate shear pin diameter to fail at a target torque overload
Wood Shear Wall Capacity Calculator
Look up tabulated unit shear for wood-frame shear walls per AWC SDPWS
Sheet Metal Bend Allowance Calculator
Calculate flat-pattern blank size from bend angle, radius, K-factor, and thickness
Shielding Gas Flow Rate Calculator
Determine the correct gas flow in CFH or L/min for MIG and TIG welding
Ship Fuel Consumption Calculator
Estimate voyage fuel burn and bunker cost across different speeds using the cube law
Ship Port Call Cost Estimator
Estimate port dues, pilotage, towage, and agency fees for a vessel port call
Ship Trim & List Calculator
Calculate trim and list change from loading, discharging, or shifting a weight
Ship Squat Calculator
Estimate ship squat in shallow water using the Barrass method
Shock Index Calculator
HR/SBP ratio for early haemodynamic instability detection
Singapore SRS Contribution Calculator
Calculate your SRS contribution cap and the income-tax saving it gives.
Slope & Grade Calculator
Convert between percent grade, degrees, rise/run, and ratio for any slope
Small Claims Court Limit Reference
Look up monetary jurisdictional limits for small claims court in every US state
Smart Contract Upgradeability Risk Checker
Score the centralisation risk of an upgradeable smart contract pattern
SOC 2 Readiness Checker
Self-assess SOC 2 trust service criteria gaps before your audit
Hyponatraemia Correction Rate Calculator
Safe sodium correction speed to avoid osmotic demyelination.
Sodium Deficit Calculator for Hyponatraemia Replacement
Volume of hypertonic saline needed to correct serum sodium
SOFA Score Calculator (Sequential Organ Failure Assessment)
Multi-organ failure scoring for ICU mortality estimation
Solar Panel Payback Calculator
Calculate solar PV break-even, savings, and CO2 offset over 25 years
Solar PV String Fuse Sizing Calculator (NEC 690.9)
Size string combiners and source-circuit fuses per NEC 690.9 for multi-string PV arrays.
South Africa Severance Pay Calculator
Calculate BCEA statutory retrenchment severance — one week's pay per year of service.
South Korea 4대보험 Calculator
Calculate Korean health, pension, employment and long-term-care premiums
Spain Autónomo Quota & IRPF Calculator
Calculate the Spanish self-employed Seguridad Social quota and IRPF retention
Spousal Support / Alimony Calculator
Estimate alimony duration and amount using common statutory factor models
Sputum Gram Stain Quality Checker (Murray-Washington Criteria)
Decide whether a sputum sample is acceptable for culture
Standby Power Waste Calculator
Calculate annual cost and CO2 from devices left on standby
Statute of Limitations by US State
Look up civil SOL periods for contract, injury, fraud and property claims
Structural Bolt Pretension Torque Calculator
Convert required pretension to installation torque for A325, A490, and metric bolts
Wood Stud Wall Load Calculator
Check if a stud wall carries a given axial load per NDS column provisions
Supply Chain Scope 3 Category 1 Estimator
Estimate purchased-goods emissions using spend-based or average-data methods
Theoretical Surface Finish (Ra) Calculator
Estimate theoretical surface roughness Ra from feed and nose radius
Sweden MOMS Calculator — 25% / 12% / 6%
Calculate Swedish MOMS at 25%, 12% or 6% by product category, both ways.
TAF Decoder
Translate a Terminal Aerodrome Forecast into readable plain-English periods
Taiwan Labor Insurance Calculator
Calculate Taiwanese 勞保, 健保 and 勞退 premiums by salary grade
Tank-Mix Partner Compatibility Reference
Check common herbicide and fungicide tank-mix compatibility from a static reference
Tap Drill Size Calculator
Find the correct tap-drill diameter for any UNC, UNF, or metric thread
Lathe Thread-Cutting Gear Train Calculator
Find change-gear combinations to cut any thread TPI on a non-quick-change lathe
Thread Pitch Calculator
Convert TPI to pitch and back for inch and metric threads
3:1 Descent Gradient Calculator
Calculate top of descent point and vertical speed for a 3-degree path
Tidal Height Harmonic Estimator
Estimate tidal height through the day from M2, S2, K1, and O1 constituents
Time of Useful Consciousness (Hypoxia) Reference
Look up TUC at altitude and the oxygen rules after a pressurisation failure
TIMI Risk Score for UA/NSTEMI
Seven-item risk predictor for MACE in unstable angina
Token Vesting & Cliff Schedule Visualiser
Visualise token unlock schedule with cliff, linear, and custom vesting
Tooling Cost per Part Calculator
Amortize insert or end-mill cost over expected part count, with break-even
Top of Descent (TOD) Calculator
Calculate top of descent distance for any angle, speed, and altitude change
Towing Capacity Checker
Verify whether your vehicle and trailer combo is within safe GVWR and towing limits
TPC & MCTC Calculator
Calculate Tonnes Per Centimetre and Moment to Change Trim One Centimetre
Trademark Nice Classification Lookup
Find the right Nice class and example identifications for trademark filings
Bacterial Transformation Efficiency Calculator
Calculate CFU/ug DNA from colony count and plating volume
Freight Transit Time Estimator
Estimate domestic LTL/FTL transit days by lane using standard distance bands
Transtubular Potassium Gradient (TTKG) Calculator
Assess renal potassium handling in hypo- and hyperkalaemia
Tree Equivalent Carbon Calculator
Convert your CO2e into the number of trees needed to absorb it
High-Sensitivity Troponin Serial Rise Calculator
Detect significant troponin rise for 0h/1h/3h ACS rule-in/rule-out
Trucking Cost Per Mile Calculator
Calculate fully-loaded cost per mile for owner-operators and fleets
Tumour Lysis Syndrome Risk Calculator (Cairo-Bishop)
Classify TLS risk before starting chemotherapy
Turkey SGK Contribution Calculator
Calculate Turkish social security (SGK) employee and employer shares.
UK Annual Leave Entitlement Calculator
Calculate UK statutory holiday entitlement (5.6 weeks) for full and part-time
UK CIS Deduction Calculator
Calculate UK Construction Industry Scheme tax deduction rates
UK ISA Annual Allowance Calculator
Calculate remaining ISA allowance and split across Cash/Stocks/LISA/JISA
UK Statutory Notice Period Calculator
Calculate minimum UK notice under the Employment Rights Act 1996 for either side.
UK SDLT Stamp Duty Land Tax Calculator
Calculate UK Stamp Duty Land Tax on residential and commercial property purchases.
UK Self-Employed Tax & NI Calculator
Calculate UK sole-trader income tax, Class 2 and Class 4 NI from your profit
UK Shared Parental Leave Calculator
Calculate SPL weeks and pay split between partners
UK Universal Credit Earnings Taper Calculator
Calculate UC entitlement after the 55p earnings taper
Under-Keel Clearance Calculator
Compute available UKC accounting for draft, squat, tide, and water density
Urinalysis Result Interpreter
Translate dipstick and microscopy findings into clinical differentials
US Backup Withholding Calculator
Calculate 24% IRS backup withholding on non-employee compensation.
California Meal & Rest Break Compliance Calculator
Calculate CA Labor Code meal/rest break obligations and premium pay
California Daily Overtime Calculator
Calculate CA daily overtime (1.5× after 8h, 2× after 12h)
US FMLA Leave Eligibility Calculator
Check FMLA eligibility and the 12-week / 480-hour entitlement from a hire date.
US HSA Contribution Limit Calculator
Compute your 2025 HSA limit for self-only or family HDHP coverage
US Federal FLSA Overtime Calculator
Calculate US federal overtime (1.5× after 40 hours per week)
US Self-Employment Tax Calculator
Estimate US Schedule SE tax (the 15.3% Social Security + Medicare share)
US W-4 Federal Withholding Estimator
Estimate federal tax withholding and the W-4 Step 4(c) adjustment
Vancomycin Dosing & AUC/MIC Calculator
Estimate vancomycin dose and interval from renal function
VAV Box Sizing Calculator
Size VAV terminal boxes by peak cooling CFM, minimum heating flow, and reheat capacity
Vehicle Accident Economic Damages Calculator
Total vehicle repair, rental, wage loss, and medical specials for an auto claim
VFD Motor Cable Derating & Shielded Cable Calculator
Conductor derating and shielded cable specs for variable-frequency drive installs
VIN Model Year Decoder
Instantly decode the model year from VIN position 10 for any year 1980–2040
VIN Structure Decoder
Break any VIN into its WMI, VDS, and VIS sections with field-level explanations
Visa Bulletin Wait-Time Estimator
Estimate years to a green card from historical priority-date movement
Warehouse Pick Rate Calculator
Calculate lines per hour, picks per shift, and labour cost per order line
Warehouse Slotting Velocity Tool
Assign pick-face slots by ABC velocity and ergonomic zone to reduce travel
Warfarin Dose Estimator (Gage Algorithm)
Estimate an initial warfarin dose from clinical and genetic factors.
Warfarin INR Dose Adjustment Calculator
Calculate a weekly warfarin dose change from the current INR
UK Waste Duty of Care Compliance Checker
Check your legal duties when producing, transporting, or disposing of business waste
Waste Hierarchy Optimizer
Find the highest waste hierarchy option for your material under the EU WFD
Water Footprint Calculator
Estimate your personal or product water footprint in litres
Water Heater Sizing Calculator
Size a storage or tankless water heater from peak-hour demand and incoming water temperature.
WEEE Compliance Checker
Check WEEE obligations for electrical and electronic equipment producers.
Weld Symbol Decoder
Decode AWS A2.4 weld symbols into plain-English joint instructions
Welder Duty Cycle Calculator
Check whether your welder can sustain a job's required on-time percentage
Welding Distortion Estimator
Estimate angular and longitudinal distortion for common weld joints
Welding Heat Input Calculator
Calculate arc energy input in kJ/mm or kJ/in for procedure qualification
Wells DVT Score with D-Dimer Interpretation
Combine the Wells score with D-dimer to drive the DVT pathway
Wells Score for DVT
Pre-test probability for deep vein thrombosis
Wells Score for Pulmonary Embolism
Clinical pre-test probability for PE to guide CTPA decisions
Whistleblowing Policy Builder
Generate a whistleblowing policy under the EU Whistleblower Directive and UK PIDA.
Window Rough Opening Calculator
Convert window or door unit size to the framed rough opening dimensions
WMI Country & Manufacturer Lookup
Find the country of manufacture and brand from a VIN's first three characters
Wood Framing Member Count Calculator
Calculate studs, plates, headers, and blocking for walls and openings
Worker Wellbeing & Social Baseline (S-KPI) Calculator
Calculate social KPIs for CSRD S1 worker wellbeing disclosure
Workers' Compensation Benefit Estimator
Estimate temporary and permanent disability benefits from average weekly wage
Wrongful Termination Back Pay Calculator
Estimate back pay, front pay, and benefits loss in wrongful-discharge claims
Albuquerque Commute Cost Calculator
Compare your true monthly commuting cost in Albuquerque — transit vs. driving
Albuquerque Cost-of-Living Index
Compare Albuquerque living costs (index near 90) to the US national average.
Albuquerque Parking Cost Estimator
Estimate daily, monthly, and annual parking costs across Albuquerque
Atlanta Commute Cost Calculator
Calculate your true monthly commuting cost in Atlanta — transit vs. driving.
Atlanta Cost-of-Living Index
Compare Atlanta living costs (index: 107) to the US national average.
Atlanta Parking Cost Estimator
Estimate daily, monthly, and annual parking costs across Atlanta neighborhoods.
Austin Commute Cost Calculator
Calculate your true monthly commuting cost in Austin — transit vs. driving.
Austin Cost-of-Living Index
Compare Austin living costs (index 120) to the US national average.
Austin Parking Cost Estimator
Estimate daily, monthly, and annual parking costs across Austin
Baltimore Commute Cost Calculator
Calculate your true monthly commuting cost in Baltimore — transit vs. driving.
Baltimore Cost-of-Living Index
Compare Baltimore living costs (index: 103) to the US national average.
Baltimore Parking Cost Estimator
Estimate daily, monthly, and annual parking costs across Baltimore neighborhoods
Big Integer Calculator
Perform arithmetic on arbitrarily large integers beyond float64
Boston Commute Cost Calculator
Compare your true monthly Boston commute cost — transit vs. driving
Boston Cost-of-Living Index
Compare Boston living costs (index 162) to the US national average
Boston Parking Cost Estimator
Estimate daily, monthly, and annual parking costs across Boston
Chicago Commute Cost Calculator
Compare your true monthly commute cost in Chicago — transit vs. driving
Chicago Cost-of-Living Index
Compare Chicago living costs against the US national average by category
Chicago Parking Cost Estimator
Estimate daily, monthly, and annual parking costs across Chicago neighborhoods.
Dallas Parking Cost Estimator
Estimate daily, monthly, and annual parking costs across Dallas neighborhoods.
Denver Commute Cost Calculator
Compare driving vs RTD transit for your true monthly Denver commute cost
Denver Cost-of-Living Index
Compare Denver living costs (index: 121) to the US national average.
Denver Parking Cost Estimator
Estimate daily, monthly, and annual parking costs across Denver districts
Houston Commute Cost Calculator
Calculate your true monthly commuting cost in Houston — transit vs. driving
Houston Cost-of-Living Index
Compare Houston living costs (index 96) to the US national average.
Houston Parking Cost Estimator
Estimate daily, monthly, and annual parking costs across Houston neighborhoods
Las Vegas Commute Cost Calculator — RTC Transit vs. Driving
Compare your true monthly Las Vegas commuting cost: RTC transit pass vs. driving with gas, parking, and depreciation.
Las Vegas Cost-of-Living Index
Compare Las Vegas living costs (index: 99) to the US national average
Las Vegas Parking Cost Estimator — Daily, Monthly & Annual by District
Estimate daily, monthly, and annual parking costs across Las Vegas neighborhoods with event surge pricing.
Los Angeles Commute Cost Calculator — Transit vs Driving
Calculate your true monthly commuting cost in Los Angeles — transit vs. driving.
Los Angeles Parking Cost Estimator
Estimate daily, monthly, and annual parking costs across LA neighborhoods
Louisville Commute Cost Calculator
Calculate your true monthly commuting cost in Louisville — transit vs. driving.
Louisville Cost-of-Living Index
Compare Louisville living costs (index: 88) to the US national average.
Louisville Parking Cost Estimator
Estimate daily, monthly, and annual parking costs across Louisville neighborhoods.
Miami Commute Cost Calculator
Calculate your true monthly commuting cost in Miami — transit vs. driving.
Miami Cost-of-Living Index
Compare Miami living costs (index: 123) to the US national average.
Miami Parking Cost Estimator
Estimate daily, monthly, and annual parking costs across Miami neighborhoods.
Milwaukee Commute Cost Calculator
Compare your true monthly commuting cost in Milwaukee — transit vs. driving.
Milwaukee Cost-of-Living Index
Compare Milwaukee living costs (index: 88) to the US national average
Milwaukee Parking Cost Estimator
Estimate daily, monthly, and annual parking costs across Milwaukee neighborhoods.
Minneapolis Commute Cost Calculator
Calculate your true monthly commuting cost in Minneapolis — transit vs. driving.
Minneapolis Cost-of-Living Index
Compare Minneapolis living costs (index: 106) to the US national average.
Minneapolis Parking Cost Estimator
Estimate daily, monthly, and annual parking costs across Minneapolis
Nashville Commute Cost Calculator
Compare the true monthly cost of transit vs. driving in Nashville.
Nashville Cost-of-Living Index
Compare Nashville living costs (index 108) to the US national average
Nashville Parking Cost Estimator
Estimate daily, monthly, and annual parking costs in Nashville.
New York City Commute Cost Calculator
Compare your true monthly commute cost in New York City — transit vs driving.
New York City Cost-of-Living Index
Compare New York City living costs (index 187) to the US average
New York City Parking Cost Estimator
Estimate daily, monthly, and annual parking costs across New York City.
Philadelphia Commute Cost Calculator
Compare your true monthly Philadelphia commute cost — SEPTA transit vs. driving.
Philadelphia Cost-of-Living Index
Compare Philadelphia living costs (index: 101) to the US national average
Philadelphia Parking Cost Estimator
Estimate daily, monthly, and annual parking costs across Philadelphia neighborhoods.
Phoenix Commute Cost Calculator
Calculate your true monthly commuting cost in Phoenix — transit vs. driving
Phoenix Cost-of-Living Index
Compare Phoenix living costs (index 103) to the US national average
Phoenix Parking Cost Estimator
Estimate daily, monthly, and annual parking costs across Phoenix neighborhoods
Portland Commute Cost Calculator
Calculate your true monthly commuting cost in Portland — transit vs. driving
Portland Cost-of-Living Index
Compare Portland living costs to the US average across six categories
Portland Parking Cost Estimator
Estimate daily, monthly, and annual parking costs across Portland neighborhoods
Sacramento Cost-of-Living Index
Compare Sacramento living costs (index: 115) to the US national average
San Antonio Commute Cost Calculator
Calculate your true monthly commuting cost in San Antonio — transit vs. driving.
San Antonio Cost-of-Living Index
Compare San Antonio living costs (index 92) to the US national average.
San Antonio Parking Cost Estimator
Estimate daily, monthly, and annual parking costs across San Antonio neighborhoods.
San Diego Commute Cost Calculator
Compare driving vs. transit commuting costs in San Diego
San Diego Cost-of-Living Index
Compare San Diego living costs (index 161) to the US national average
San Diego Parking Cost Estimator
Estimate daily, monthly, and annual San Diego parking costs
San Francisco Commute Cost Calculator
Compare the true monthly cost of a Muni pass versus driving in San Francisco
San Francisco Cost-of-Living Index
Compare San Francisco living costs (index 194) to the US national average
San Francisco Parking Cost Estimator
Estimate daily, monthly, and annual parking costs across San Francisco
San Jose Commute Cost Calculator
Compare your true monthly commuting cost in San Jose: transit vs. driving
San Jose Cost-of-Living Index
Compare San Jose living costs to the US national average
San Jose Parking Cost Estimator
Estimate daily, monthly, and annual parking costs across San Jose
Seattle Commute Cost Calculator
Calculate your true monthly commuting cost in Seattle — transit vs. driving.
Seattle Cost-of-Living Index
Compare Seattle living costs to the US average and convert your salary
Seattle Parking Cost Estimator
Estimate daily, monthly, and annual parking costs across Seattle neighborhoods.
Malaysia SST Calculator (Sales and Services Tax) 2025
Add or extract Malaysia Sales and Services Tax at 8% — instant result in your browser.
Mexico IVA Calculator (Impuesto al Valor Agregado) 2025
Add or extract Mexico Impuesto al Valor Agregado at 16% — instant result in your browser.
SIP Calculator
Project the future value of a monthly SIP investment.
Hours Between Times Calculator
Duration between two clock times, with break deduction.
Road Trip Cost Calculator
Estimate the fuel cost of a journey and split it between passengers.
EV Charging Cost Calculator
Work out the cost of charging your electric car from any % to any %.
Car Depreciation Calculator
Project a car's resale value year by year using a declining-balance rate.
Grade Calculator
Add your assignments and points to get your overall grade and letter.
Final Grade Needed Calculator
Find the exact score you need on your final to hit your target grade.
Words Per Minute Typing Test
Measure your typing speed in WPM with live accuracy tracking.
UK Degree Classification Calculator
Work out your credit-weighted average and honours classification.
Spain NIF / NIE / DNI Validator
Check the control letter of a Spanish DNI, NIE or NIF instantly.
Poland PESEL Decoder
Decode date of birth, sex and check digit from a Polish PESEL.
South Africa ID Number Decoder
Decode birth date, gender and citizenship from a South African ID.
Chile RUT Validator
Verify a Chilean RUT/RUN verifier digit and get the correct one.
Leap Year Checker
Check if any year is a leap year and see why.
Day of Year Calculator
Find the ordinal day number and ISO week for any date.
Discount Stacking Calculator
Combine multiple discounts and see the true compounded saving.
Germany Steuer-ID Validator (Steuerliche Identifikationsnummer)
Check an 11-digit German Steuer-ID with the official MOD 11,10 check digit.
France NIR / Numéro de Sécurité Sociale Validator
Validate a French social-security number and decode its 13-digit structure.
Sweden Personnummer Decoder & Luhn Validator
Decode a Swedish personnummer — date of birth, gender and Luhn check digit.
Finland HETU Decoder (Henkilötunnus)
Decode a Finnish HETU — date of birth, gender and modulo-31 control character.
Denmark CPR Number Decoder
Decode a Danish CPR (personnummer) — date of birth, gender and century.
Norway Fødselsnummer Decoder
Decode a Norwegian fødselsnummer — date of birth, gender and checksum.
Belgium National Number Decoder
Decode a Belgian Rijksregisternummer — date of birth, gender, checksum.
Pakistan CNIC Validator & Decoder
Check a 13-digit Pakistani CNIC and read its province and gender digit.
Bangladesh NID Validator
Check a 10, 13 or 17-digit Bangladesh NID and read its embedded fields.
Malaysia MyKad Decoder
Decode a 12-digit MyKad — date of birth, place of birth and gender.
Thailand National ID Validator
Validate a 13-digit Thai National ID with its official mod-11 check digit.
China Resident ID Decoder & Validator
Decode an 18-character Chinese ID and verify its ISO 7064 check character.
Vietnam CCCD Decoder
Decode a 12-digit Vietnamese CCCD — province, birth year and gender.
Nigeria NIN Validator — Check Your 11-Digit NIN Format
Validate the format of a Nigerian National Identification Number offline.
Kenya National ID Validator — Check ID Number Format
Validate the format of a Kenyan national ID number offline.
Ghana Card PIN Validator — Check GHA Number Format
Validate the GHA-NNNNNNNNN-N format of a Ghana Card PIN offline.
Tanzania NIDA Number Validator & Decoder
Validate a 20-digit Tanzanian NIDA NIN and decode its date of birth.
Uganda NIN Validator & Decoder — Class, Gender & Birth Year
Validate a 14-character Ugandan NIN and decode its class, gender and birth-year digits.
Saudi Iqama & National ID Validator
Validate a 10-digit Saudi ID or Iqama with the official check-digit algorithm.
Israel Teudat Zehut (ID) Validator
Validate an Israeli Teudat Zehut number with the official checksum.
Morocco CIN / CNI Validator
Check a Moroccan CIN format and read the issuing-bureau region from the prefix.
Jordan National ID Validator
Check a 10-digit Jordanian National Number and read its generation marker.
Argentina CUIT / CUIL Decoder
Verify an Argentine CUIT/CUIL check digit and read its type prefix and DNI.
Colombia Cédula & NIT Validator
Check a Colombian cédula format and compute the NIT modulo-11 check digit.
Peru DNI Validator
Format-check a Peruvian DNI and compute its RENIEC verification digit.
Ecuador Cédula Validator
Validate an Ecuadorian cédula with the official modulo-10 algorithm.
Chile RUT / RUN Checker
Verify a Chilean RUT/RUN verifier digit with the modulo-11 algorithm.
US SSN Format Validator — Check Social Security Number Structure
Validate the structure of a US Social Security Number against SSA rules.
Australia TFN Validator — Tax File Number Checksum
Validate an Australian Tax File Number with the ATO modulus-11 checksum.
New Zealand IRD Number Validator — Check Digit Verification
Validate a New Zealand IRD number with the Inland Revenue modulus-11 check.
India Aadhaar Format Validator — Verhoeff Checksum Check
Validate the format of an Indian Aadhaar number with the Verhoeff checksum.
Chinese Zodiac Finder
Find your Chinese zodiac animal, element and yin-yang from your birth date.
Watts to Kilowatt-Hours (kWh) Calculator
Turn watts and running time into kWh — kWh = (W × hours) ÷ 1000. Free, browser-only.
Data Transfer Cost Calculator
Estimate cloud or CDN egress cost from volume, price per GB and free tier.
Gross to Net Pay Estimator
Estimate take-home pay from gross using your own deduction percentages.
Steps to Distance Calculator
Convert daily steps into kilometres, miles and estimated calories.
Modulo Calculator (Remainder)
Find a mod n — both the truncated and floored remainder conventions.
Work Hours Calculator
Add up a weekly timesheet — daily hours, breaks and optional gross pay.
Rent vs Buy Calculator
Compare the long-term cost of renting versus buying a home.
Scientific Calculator
Evaluate expressions with trig, logs, roots, powers, and factorials.
What Day Was I Born
Find out which day of the week you were born on.
Spain CIF Validator
Check the control character of a Spanish company tax ID (CIF) instantly.
Indonesia NPWP Validator
Check the structure of an Indonesian taxpayer number (NPWP) instantly.
Switzerland AHV Validator
Check the EAN-13 check digit of a Swiss AHV / AVS number instantly.
Greece AMKA Decoder
Decode the birth date and check digit of a Greek AMKA instantly.
Credit Card Payoff Calculator
How long to clear a card — and what the interest costs.
Lease vs Buy Calculator
Compare the true cost of leasing against buying with finance.
Child Height Predictor
Estimate a child's adult height from the parents' heights.
Time Until the Weekend
Live countdown to Saturday — how long until the weekend.
Parallel Resistance Calculator
Total resistance of resistors wired in parallel.
Series Resistance Calculator
Total resistance of resistors wired in series.
Power (Watts) Calculator
Electrical power from voltage, current and resistance.
Work and Power Calculator
Work W = F·d·cos θ and power P = W/t or P = F·v.
Music Interval Calculator
Transpose a frequency by any interval and see ratios in cents.
Video Bitrate Calculator
Work out video file size from bitrate and duration, or the reverse.
Cost-Plus Pricing Calculator
Set a selling price by adding a markup to your unit cost.
Hourly Rate Calculator
Convert an annual salary into an equivalent hourly rate.
Smoking Cost Calculator
See what smoking costs per day, month, year and beyond.
Slope Calculator
Slope, equation and angle of a line through two points.
Distance Between Two Points Calculator
Straight-line distance between two coordinates.
Midpoint Calculator
Find the midpoint between two coordinates.
Quarter Calculator
Find which calendar quarter a date falls in, with start and end dates.
Fiscal Year Calculator
Find the fiscal year for any date — UK, US, Australia and more.
Polynomial Roots Calculator
Find the real and complex roots of quadratic and cubic equations.
Exposure Value (EV) Calculator
Compute EV and EV100 from aperture, shutter and ISO.
F-Stop Calculator
Stops difference and light change between two apertures.
FPS Timecode Calculator
Convert HH:MM:SS:FF timecode to frames and real time.
Bitrate Calculator (Audio + Video)
Find the bitrate needed to fit a target file size.
Zakat Calculator
Work out zakat at 2.5% on wealth above the nisab threshold.
Tithe Calculator
Calculate your tithe from gross or net income at any rate.
Change Maker Calculator
Work out change owed and the fewest notes and coins to give it.
Sweat Rate Calculator
Work out how much fluid you lose during exercise.
Blood Type Inheritance Calculator
Predict a child's possible blood types from both parents.
Period & Cycle Tracker
Predict your next period, ovulation and fertile window.
Body Frame Size Calculator
Small, medium or large frame from height and wrist.
Resting Metabolic Rate Calculator
Estimate your RMR and daily calorie needs.
Semester Weeks Calculator
Count how many weeks a semester or term runs from start to end.
Time Tracker & Timesheet
Start and stop timers per project, see daily and weekly totals, export a CSV timesheet.
Rent vs Buy Comparison Calculator
Full multi-year comparison with breakeven point and net-worth chart.
Exam Time Per Question Calculator
Pace your exam — how long to spend on each question.
Group Gift Splitter
Split a group gift fairly — down to the last cent.
Road Trip Time Estimator
How long will the drive really take — with rest stops added.
Parking Cost Calculator
Find the cheapest way to pay — hourly, daily cap or weekly pass.
Grade Tracker
Track every course, weight each assignment and see the score you need on the final.
Subscription Tracker
Track every subscription, see your true monthly and yearly spend, and never miss a renewal.
Tax Bracket Visualizer
See how a progressive tax schedule splits your income — marginal vs effective, on a stacked bar.
Cap Rate Calculator
Capitalization rate from NOI and property value.
Cash-on-Cash Return Calculator
Annual cash flow as a percentage of cash invested.
Inventory Turnover Calculator
How many times you sell through stock per year.
Darts Checkout Calculator
Find a 1–3 dart finish for any score from 2 to 170.
Light Travel Time Calculator
How long light takes to cross any distance in space.
Pomodoro Estimator
Estimate how long a set of pomodoros will really take.
Cycling Power Estimator
Estimate the watts needed to ride at a given speed.
Screen Time Cost Calculator
See how many hours and how much your daily screen time really adds up to.
Travel Itinerary Planner
Plan trips day by day with timed activities, costs and a printable PDF.
Weekly Schedule Maker
Build a colour-coded weekly timetable and export it to PDF.
Bill Reminder Tracker
Track every recurring bill, see what is due, and never miss a payment.
Timesheet Maker
Log daily hours per project, see totals and billable amounts, export to CSV.
Subscription Cost Tracker
Track every subscription, see your true monthly and yearly spend, and never miss a renewal.
Portfolio Rebalancer
Turn target allocations into exact buy and sell amounts.
Project Timeline Calculator
Turn task estimates in working days into real start and finish dates.
Final Grade Calculator
Work out the exact score you need on your final exam to hit your target grade.
Semester GPA Planner
Track every semester, see your cumulative 4.0 GPA, and reverse-solve a target.
Half-Life Calculator
Solve radioactive decay for remaining amount, time or half-life — with a decay chart.
Density Calculator
ρ = m ÷ V — solve for density, mass, or volume with full unit conversion
Dew Point Calculator
Temperature + relative humidity → dew point, comfort rating, wet-bulb temp.
Force Calculator (F = ma)
Newton's second law — solve for force, mass, or acceleration with full unit handling.
Heat Index Calculator
Temperature + humidity → feels-like heat index with risk category, in °C and °F.
Wind Chill Calculator
Find the real feels-like temperature: air temp + wind speed → wind chill with frostbite risk.
Japan Consumption Tax Calculator
Add or remove Japan's 10% standard or 8% reduced consumption tax instantly.
Ten-Pin Bowling Score Calculator
Enter each roll and watch the official scorecard fill in automatically.
Cricket Net Run Rate (NRR) Calculator
Calculate your tournament NRR correctly — with the bowled-out rule applied.
Cricket Run Rate Calculator
Instantly calculate CRR and RRR — current and required run rates for any match situation.
Darts Checkout Calculator
Find every valid finish for any score from 2 to 170.
Golf Handicap Calculator
Score differentials and Handicap Index using the World Handicap System (WHS).
Race Time Predictor
Predict finish times across every distance from one known race result.
Run/Walk Interval Calculator
Plan your run-walk intervals, find your effective pace and finish time.
Resting Metabolic Rate Calculator
Five peer-reviewed equations, macro splits, formula working — all in your browser.
Watts per kg Calculator
Find your cycling W/kg and Coggan category in seconds.
Body Frame Size Calculator
Determine your skeletal frame size and ideal body weight range instantly.
Doubling Time Calculator
How long until your money, population, or investment doubles?
Drone Flight Time Calculator
Physics-based flight time from battery, mass, rotors and altitude.
Country Plug Type Finder
Instantly look up the plug type, voltage and frequency for any country.
Name Day Finder
Find the name day for any first name — or discover which names are celebrated on any date.
What Time Is It In…?
Instant live clock for any city or country — runs entirely in your browser.
Zodiac Sign Calculator
Find your Western zodiac sign, element, quality and ruling planet from your birthday.
Chinese Zodiac Calculator
Find your animal sign, element, Yin/Yang polarity and lucky attributes from your birth date.
Country Dialing Code Lookup
Find any country dialing code instantly and convert local numbers to international format.
Country Driving Side Lookup
Instantly check whether any country drives on the left or right side of the road.
Mixed Number Calculator
Add, subtract, multiply and divide mixed numbers with full working shown.
Time Zone Difference Calculator
Compare the current time (or any custom time) across multiple time zones instantly.
Developer Tools
JSON & Data
JSON Formatter & Validator
Pretty-print, minify and validate JSON instantly.
SQL Playground
Run real SQL against an in-browser SQLite database — no install, no server.
CSV Explorer & Cleaner
Paste or upload a CSV, then sort, filter, de-duplicate and export it.
Avro Schema Viewer
Parse and visualize Apache Avro schema JSON files as a collapsible tree.
CBOR to JSON Converter
Decode CBOR (RFC 8949) binary data to readable JSON, fully in your browser.
Config File Diff (ENV / TOML / INI)
Diff two .env, .toml, or .ini config files and see key-level changes
CSV Cleaner
Trim whitespace, fix encodings, and normalize line endings in CSV files
CSV Column Statistics
Get min, max, mean, median, std-dev, and null-count per CSV column
CSV Date Format Normalizer
Detect and normalize inconsistent date columns in CSV to ISO 8601.
CSV Deduplicator
Remove duplicate rows from a CSV by one or more key columns
CSV Diff
Compare two CSV files row-by-row and highlight added, removed, changed rows
CSV Offline Geocoder (City / Country Level)
Add lat/lon to a CSV city column using an embedded gazetteer — no API.
CSV Joiner
Join / merge two CSV files on a shared key column (SQL-style LEFT JOIN)
CSV Outlier Detector
Flag statistical outliers in numeric CSV columns using IQR or Z-score.
CSV Pivot Table Builder
Build pivot tables from a CSV — rows, columns, values, aggregation
CSV Splitter
Split a large CSV into smaller chunks by row count or column value
CSV to GeoJSON Converter
Build GeoJSON from a CSV with lat/lon columns — instant map-ready output
CSV to GraphQL Mutation Generator
Turn a CSV into ready-to-run GraphQL createX mutation calls, one per row.
CSV to KML Converter
Build Google Earth KML from a CSV with lat/lon columns
CSV to NDJSON Converter
Convert CSV to Newline-Delimited JSON for log pipelines and BigQuery
CSV to XLSX Converter
Convert a CSV file into an Excel .xlsx workbook right in your browser
CSV to XML Converter
Convert CSV rows to XML elements with configurable root and row tag names
CSV to YAML Converter
Convert CSV data to a YAML list of mappings for config files and pipelines
CSV Column Type Inferrer
Detect the probable data type of each CSV column — date, int, float, bool
DNS-over-HTTPS Privacy Query Tester
Resolve a domain via Cloudflare or Google DoH and compare the answers side by side
GeoJSON Minifier
Strip whitespace and round coordinate precision to shrink GeoJSON files
GeoJSON Geometry Simplifier
Simplify complex GeoJSON geometries with Visvalingam-Whyatt to reduce size
GeoJSON to CSV Converter
Flatten GeoJSON properties + coordinates to a downloadable CSV
GeoJSON to GPX Converter
Convert GeoJSON Features and FeatureCollections to valid GPX 1.1
GeoJSON to TopoJSON Converter
Convert GeoJSON to TopoJSON to shrink file size via shared arcs
GeoJSON Validator
Validate GeoJSON against RFC 7946 and show geometry errors inline
GPX to CSV Converter
Export GPX track points to CSV with lat, lon, ele and time columns
GPX to GeoJSON Converter
Turn GPS tracks into GeoJSON for web maps and data pipelines
GraphQL Schema Visualizer
Paste a GraphQL SDL schema and see type relationships as a graph.
ICC Profile to JSON Converter
Decode an ICC/ICM color profile binary to human-readable JSON
JSON Diff
Compare two JSON objects and see added, removed, and changed fields
JSON Lines / NDJSON Viewer
Browse and filter NDJSON files line-by-line with a searchable table
JSON Schema Validator
Validate JSON documents against a JSON Schema (draft-07 / 2020-12)
JSON to CBOR Converter
Encode JSON to compact CBOR binary and see the hex dump and byte savings.
JSON to GraphQL Schema Generator
Generate a GraphQL SDL schema from a sample JSON object
JSON to HTML Table
Convert a JSON array of objects into a clean HTML table — copy or preview.
JSONPath Tester
Test JSONPath expressions against a JSON document and see matching nodes
KML to CSV Converter
Extract KML Placemark coordinates and names to a flat CSV
NDJSON Validator
Validate every line of an NDJSON file and report parse errors by line number
Parquet Schema Viewer
Inspect the schema and metadata of a Parquet file without a backend
Plist to JSON Converter
Convert macOS XML or binary plist to JSON in your browser
Prisma Schema Viewer
Parse a Prisma schema.prisma and view models, fields, types and relations.
Protobuf Decoder (No Schema)
Decode raw Protobuf wire bytes without a .proto file, right in your browser.
Shapefile to GeoJSON Converter
Convert ESRI Shapefiles to GeoJSON entirely in the browser
XML Sitemap Validator
Validate a sitemap.xml for schema compliance and detect malformed entries
SQL CREATE TABLE to JSON Schema
Convert SQL CREATE TABLE DDL into a JSON Schema draft-07 or TypeScript interface.
SQLite Schema Viewer
Inspect SQLite table schemas, indexes and foreign keys without a GUI
SQLite to CSV Exporter
Export any SQLite table to CSV directly in your browser
SQLite Database Viewer
Open and browse SQLite .db files in your browser — no upload
TopoJSON to GeoJSON Converter
Decode TopoJSON back to GeoJSON for tools that don't support TopoJSON
XLSX to CSV Converter
Convert Excel spreadsheet sheets to CSV files — no Excel required
YAML Linter
Lint YAML for syntax errors, duplicate keys, and common gotchas
CSV Field Escaper/Unescaper
Wrap and escape fields with commas, quotes, or newlines in CSV
Fake GeoJSON Generator
Random GeoJSON features for mapping tool demos
JSON String Escaper/Unescaper
Escape control chars and backslashes for valid JSON strings
Mock CSV Generator
Downloadable CSV test data in seconds
Mock SQL Rows Generator
Ready-to-run INSERT statements with realistic fake data for any table
Mock TOML Generator
Fake TOML config files for Rust and other tools
Mock XML Generator
Structured XML test data for legacy systems
Mock YAML Generator
Fake YAML config files for testing and demos
JSON-LD Schema Markup Generator
Structured data snippets for SEO and AI discovery
Random JSON Schema Generator
Valid JSON Schema documents for API tooling tests
SQL String Escaper
Escape single quotes and backslashes for safe SQL literals
Protobuf Varint Encoder/Decoder
Encode integers as Protocol Buffers variable-length integers
XML Entity Escaper/Unescaper
Escape the 5 XML special chars amp, lt, gt, apos, and quot
JSON to CSV Converter
Flatten a JSON array of objects into clean CSV.
CSV to JSON Converter
Turn CSV into a clean JSON array of objects.
JSON to YAML Converter
Convert JSON into clean, readable YAML.
YAML to JSON Converter
Convert YAML config into formatted JSON.
XML Formatter & Minifier
Pretty-print or minify XML right in your browser — nothing is uploaded.
YAML Formatter & Re-indenter
Normalise YAML indentation and spacing in your browser — no upload.
SQL Formatter & Beautifier
Pretty-print SQL queries in your browser — keywords on their own lines.
JSON to XML Converter
Convert JSON objects and arrays into well-formed XML.
XML to JSON Converter
Convert XML documents into clean, structured JSON.
JSON to TOML Converter
Convert JSON into clean TOML config syntax.
TOML to JSON Converter
Convert TOML config files into structured JSON.
JSON to TypeScript Interface
Generate TypeScript interfaces from a JSON sample.
JSON Escape / Unescape
Encode text into a JSON string or decode it back.
CSV to TSV Converter
Convert comma-separated values to tab-separated values.
TSV to CSV Converter
Convert tab-separated values to proper RFC 4180 CSV.
JSON to SQL INSERT Generator
Turn a JSON array of objects into SQL INSERT statements.
CSV to SQL INSERT Generator
Turn a CSV file into SQL INSERT statements.
JSON String Escape / Unescape
Escape text into a JSON string literal, or unescape it back.
JSON Minifier
Compact JSON to a single line and validate it.
JSON Diff Tool
Compare two JSON documents and see what changed.
JSON to Go Struct
Generate Go structs with json tags from a JSON sample.
JSON to Zod Schema
Generate a Zod validation schema from a JSON sample.
SQL Cheatsheet
The everyday SQL statements, grouped and searchable — copy any one.
JSONPath Tester
Test JSONPath expressions against your JSON, live in the browser.
Mock JSON Generator
Generate realistic mock JSON records for users, products and posts.
JSONPath Query Playground
Paste JSON, run JSONPath expressions, see matched values and their paths live.
Excel (XLSX) to CSV & JSON Converter
Upload a spreadsheet, pick a sheet, preview it, and export clean CSV or JSON.
JSON to .env Converter
Turn a JSON config object into dotenv key=value lines — in your browser.
.env to JSON Converter
Parse a dotenv file into a clean JSON object — privately in your browser.
JSON Flattener
Flatten nested JSON into single-level dot-path keys — in your browser.
JSON Unflattener
Rebuild nested JSON from flat dot-path keys — privately in your browser.
JSON Key Sorter
Sort JSON object keys alphabetically and recursively — in your browser.
SQL IN Clause Builder
Turn a list of values into a ready-to-paste SQL IN (...) clause.
CSV to HTML Table
Convert CSV into a clean, escaped HTML <table> you can paste anywhere.
HTML Table to CSV
Extract any HTML <table> into clean, properly quoted CSV.
JSON Schema Generator
Paste JSON and infer a ready-to-use JSON Schema you can copy or download.
CSV Merger
Combine two or more CSV files by stacking rows or joining on a key column.
YAML / JSON / TOML Converter
Paste any of the three formats and convert instantly between them.
CSV Statistics Analyzer
Upload a CSV and get instant per-column stats, distributions and histograms.
JSON Flatten / Unflatten
Convert nested JSON to dot-notation keys and back, losslessly.
SQL and GraphQL Formatter
Paste a messy SQL or GraphQL query and pretty-print it with clean indentation.
JSON Pretty-Diff
Compare two JSON documents and see exactly what was added, removed or changed.
JSON to Protobuf Schema Generator
Paste sample JSON and infer a ready-to-use Protocol Buffers .proto file.
JSON to TypeScript Interfaces
Paste JSON, get clean nested TypeScript interfaces or type aliases.
SQL Minifier
Collapse formatted SQL into the smallest valid one-line statement.
CSV to JSON Converter (and JSON to CSV)
Convert CSV to a JSON array or JSON back to CSV — with delimiter and header controls.
CSV Diff Tool
Compare two CSV files by a key column and see added, removed and changed rows.
TOML ⇄ JSON Converter
Convert between TOML and JSON in either direction, with validation.
YAML to JSON Converter (Both Directions)
Paste YAML or JSON, convert either way with validation and clear error messages.
Nested JSON Flattener
Flatten nested JSON to dot-notation keys, unflatten back, and export flat CSV.
Query String Parser & Builder
Parse a URL query into an editable table, then rebuild and copy it.
Product Schema Generator
Generate valid schema.org Product JSON-LD for rich Google results.
Breadcrumb Schema Generator
Generate valid schema.org BreadcrumbList JSON-LD in seconds.
FAQ Schema Generator
Build valid FAQPage JSON-LD structured data in seconds.
Schema Markup Generator
Generate valid JSON-LD structured data for any schema.org type instantly.
Video Schema Generator
Generate valid schema.org VideoObject JSON-LD for better video SEO.
Article Schema Generator
Build valid JSON-LD structured data for any article type in seconds.
Local Business Schema Generator
Generate valid schema.org/LocalBusiness JSON-LD for Google Rich Results — free and instant.
Encoding & Crypto
JWT Decoder
Decode any JSON Web Token instantly — header, payload, and timestamps.
Base64 Encoder/Decoder with Binary Safety
Encode or decode Base64 and Base64url strings with binary-safe handling
UUID Generator & Version Validator
Generate cryptographically random UUIDs v4/v7 and validate the version of any UUID
Base64 File Encoder / Decoder
Encode any file to base64 or decode base64 back to a file — fully local.
Bcrypt Hash Generator & Verifier
Hash or verify a password with bcrypt at any cost factor, fully in-browser
HTML Entity & Unicode Escape Decoder
Decode HTML entities, \uXXXX escapes, and percent-encoding in a single pass
JWT Decoder & Structure Verifier
Decode a JWT and inspect its header, payload, and expiry locally
Shapefile Viewer (SHP + DBF)
View ESRI Shapefile geometries and attribute table in your browser
Subresource Integrity (SRI) Hash Generator
Paste or drop a JS/CSS file and get the sha384 SRI hash for your script or link tag
Text Hash Generator
Hash any text with MD5, SHA-1, SHA-256, SHA-384, or SHA-512 — locally.
Bulk UUID / ULID Generator
Generate thousands of UUID v4 or ULID values and download as CSV or TXT.
Backslash Escaper & Unescaper
Escape special characters with C-style backslash sequences
Base32 Crockford Encoder/Decoder
Douglas Crockford's human-friendly Base32 without I, L, O, U
Base32 Encoder and Decoder
Encode text to RFC 4648 Base32 and decode it back, with optional padding
Base32 Geohash Alphabet Encoder
Encode data using the geohash Base32 character set
Base32Hex Encoder and Decoder
Extended hex Base32 variant used in DNSSEC NSEC3 and sortable IDs
Base58 Bitcoin Encoder/Decoder
Bitcoin-style Base58 encoding — no 0, O, I, l confusion
Base58 Flickr Encoder/Decoder
Flickr's Base58 variant for short photo URL IDs
Base58 Ripple Encoder/Decoder
XRP Ledger Base58Check address encoding and decoding
Base64 MIME Encoder (Line-Wrapped)
Standard MIME Base64 with 76-char line breaks per RFC 2045
PEM Base64 Encoder (64-char Lines)
OpenSSL-style Base64 wrapped at 64 chars with header/footer
Base85 / Ascii85 Encoder/Decoder
PDF and PostScript-style 5-char-per-4-bytes encoding
C String Literal Escaper & Unescaper
Convert text to valid C/C++ string literal content and back
CRC-16/Modbus Checksum Calculator
Compute CRC-16 using the Modbus polynomial variant
CRC-16 Checksum Calculator
Compute the 16-bit CRC-16/CCITT checksum
CRC-32 Checksum Calculator
Compute the standard 32-bit CRC-32 checksum
CRC-32C (Castagnoli) Checksum
Compute CRC-32C for iSCSI, SCTP, and NVMe integrity checks
CRC-64 Checksum Calculator
Compute a 64-bit CRC for large data integrity checks
CRC-8 Checksum Calculator
Compute the 8-bit CRC checksum of any text or hex bytes
CRC32 Checksum Calculator
Compute the CRC-32 checksum of text encoded as UTF-8 bytes
Decimal Integer to Base64
Encode a decimal integer directly as a Base64 string
JWT-Format Token Generator
Base64url-encoded JWT-format tokens for testing
Geohash to Lat/Lng Converter
Decode a geohash string back to lat/long bounding box and center
Git Object Hash Calculator
Calculate the SHA-1 git blob/tree/commit hash for text
BLAKE2b Hash Generator
Compute a BLAKE2b digest (up to 512 bits)
BLAKE2s Hash Generator
Compute a BLAKE2s digest (up to 256 bits)
BLAKE3 Hash Generator
Compute the ultra-fast BLAKE3 cryptographic digest in your browser
djb2 Hash Calculator
Compute the classic djb2 string hash function
FNV-1a Hash Calculator
Compute the fast non-cryptographic FNV-1a hash
Hash Identifier
Identify which algorithm produced a given hash string
Keccak-256 Hash Generator
Compute the Ethereum-style Keccak-256 digest
MD5 Hash Generator
Compute the 128-bit MD5 digest of any text
MurmurHash3 Calculator
Compute the MurmurHash3 32-bit hash for hash tables
RIPEMD-160 Hash Generator
Compute the 160-bit RIPEMD-160 digest used in Bitcoin
SHA-1 Hash Generator
Compute the 160-bit SHA-1 digest of any text
SHA-224 Hash Generator
Compute the 224-bit SHA-2 digest of any text
SHA-256 Hash Generator
Compute the 256-bit SHA-256 digest of any text
SHA-3 (256-bit) Hash Generator
Compute a 256-bit Keccak-based SHA-3 digest
SHA-3 (512-bit) Hash Generator
Compute a 512-bit Keccak-based SHA-3 digest
SHA-384 Hash Generator
Compute the 384-bit SHA-2 digest of any text
SHA-512/256 Hash Generator
Compute the SHA-512/256 truncated digest of any text
SHA-512 Hash Generator
Compute the 512-bit SHA-2 digest of any text
Whirlpool Hash Generator
Compute the 512-bit Whirlpool cryptographic digest
xxHash Calculator
Compute the extremely fast xxHash32/64 non-cryptographic hash
HMAC-SHA256 Generator
Compute keyed HMAC-SHA256 message authentication codes
HTML Entity Decoder
Decode HTML named, decimal, and hex entities back to plain text
HTML Named Entity Encoder/Decoder
Convert special characters to named entities like &amp; and &lt;
HTML Numeric Entity Encoder/Decoder
Convert characters to &#160; decimal or &#x00A0; hex entities
JWT Decoder (Header + Payload)
Decode JWT header and payload Base64url segments visually
JWT HS256 Encoder (Client-Side)
Build and HMAC-sign a JWT token in your browser
Lat/Lng to Geohash Converter
Encode geographic coordinates as a geohash string
Base58Check Encoder (with Checksum)
Base58 + 4-byte SHA256d checksum — Bitcoin address format
Punycode Encoder/Decoder
Convert international domain names to and from Punycode (ACE)
Punycode / IDN Encoder/Decoder
Convert Unicode domain names to ASCII-compatible xn-- form
Quoted-Printable Encoder/Decoder
MIME-safe encoding that keeps ASCII readable in email bodies
Shell Argument Escaper
Quote and escape strings for safe Bash/sh command arguments
Unicode \u Escape Encoder & Decoder
Encode any string as \uXXXX or \UXXXXXXXX escape sequences
URL-Safe Base64 Encoder/Decoder
Base64 with + to - and / to _ for URL and filename safety
UUID Generator
RFC-compliant version-4 UUIDs in bulk or one at a time
UUID Version Identifier
Parse a UUID string and identify its version and variant
Base64 Encoder
Encode text to Base64 — standard or URL-safe — in your browser.
Base64 Decoder
Decode Base64 back to text — standard and URL-safe — in your browser.
URL Encoder
Percent-encode text and URLs — component or full-URL mode.
HTML Entity Encoder & Decoder
Escape and unescape HTML entities — safely, in your browser.
SHA-1 Hash Generator
Generate a SHA-1 hash from any text instantly — in your browser.
SHA-256 Hash Generator
Generate a SHA-256 hash from any text instantly — in your browser.
SHA-512 Hash Generator
Generate a SHA-512 hash from any text instantly — in your browser.
MD5 Hash Generator
Generate an MD5 hash from any text instantly — in your browser.
CRC-32 Checksum Generator
Compute a CRC-32 checksum from any text — hex and decimal, in your browser.
UUID v4 Generator
Generate random RFC 4122 UUID v4 identifiers in bulk.
UUID v1 Generator
Generate time-based RFC 4122 UUID v1 identifiers.
UUID v7 Generator
Generate sortable, timestamp-prefixed UUID v7 identifiers.
ULID Generator
Generate sortable, URL-safe ULID identifiers.
Nano ID Generator
Generate compact, URL-safe Nano IDs with custom length and alphabet.
JWT Claims Explainer
Decode a JWT and see what every standard claim actually means.
Color Shades & Tints Generator
Generate tints, shades and a full tonal scale from any base colour.
JWT Generator (HS256)
Sign HS256 JSON Web Tokens in your browser with Web Crypto.
CSS Color Shades & Tints Generator
Build shades and tints of any colour and copy them as CSS variables.
Tailwind Shade Generator
Turn one colour into a full Tailwind 50–950 palette config.
Color From Text Hash
Turn any string into a consistent, repeatable color.
HMAC Generator
Keyed-hash message authentication codes — SHA-256, SHA-384, SHA-512.
Base32 Encoder & Decoder
Encode and decode RFC 4648 Base32 — case-insensitive, A–Z and 2–7.
Base58 Encoder & Decoder
Encode and decode Base58 using the Bitcoin alphabet.
SHA3-256 Hash Generator
Generate FIPS 202 SHA3-256 (Keccak) hashes in your browser.
RIPEMD-160 Hash Generator
Generate 160-bit RIPEMD-160 hashes in your browser.
CSS Box Shadow Generator
Build a box-shadow with live preview and copy the CSS.
CSS Text Shadow Generator
Style a text-shadow with live preview and copy the CSS.
Base64 URL-Safe Encoder
Encode and decode Base64URL (RFC 4648 §5) for tokens and URLs.
Quoted-Printable Encoder
Encode and decode Quoted-Printable (RFC 2045) email content.
Punycode Converter
Convert between Unicode domains and Punycode (xn--) per RFC 3492.
Base85 Encoder
Encode and decode Base85 (Z85) — compact 4-byte to 5-char binary text.
ASCII85 Encoder
Encode and decode Adobe ASCII85 used in PostScript and PDF.
File Hash & Checksum Tool
Compute MD5, SHA-1, SHA-256 and SHA-512 for any file — and verify it.
JWT Builder
Build and sign a JSON Web Token (HS256) entirely in your browser.
Multiple Box Shadow Generator
Stack, reorder and tune layered CSS box-shadows with a live preview.
Hash Generator (SHA-1 / SHA-256 / SHA-384 / SHA-512)
Hash text or files with multiple SHA algorithms at once and verify checksums.
CSS Text-Shadow Generator
Build layered text shadows visually and copy the CSS.
Base64 File Encoder & Decoder
Encode any file to Base64 or a data URL, and decode Base64 back to a downloadable file.
UUID / ULID Batch Generator
Generate hundreds of v4 UUIDs or ULIDs at once, then copy or download.
Text Encryptor (AES-256)
Password-encrypt any text with AES-256-GCM, entirely in your browser.
HTML Entity Encoder / Decoder
Convert text to and from HTML entities — named and numeric.
Base32 Encoder / Decoder
Encode and decode text to RFC 4648 base32, right in your browser.
URL Encoder / Decoder
Percent-encode or decode URLs and query values — component or full-URL mode, batch lines, copy.
String Escape Tool
Escape or unescape a string for JSON, JavaScript, CSV, SQL, regex and shell.
Base58 Encoder / Decoder
Bitcoin-style Base58 and Base58Check encode and decode, right in your browser.
Color
Color Converter + WCAG Contrast Checker
Convert hex, RGB, and HSL colours instantly — and check WCAG contrast ratios.
CSS Color & Variable Extractor
Extract all custom properties and color values from a CSS file
Hex Dump Viewer
View any file as a classic offset-hex-ASCII dump, entirely in your browser.
KML Color / Style Editor
Edit KML Placemark colors, line widths, and icon scale in your browser
Secure Random Bytes / Hex Generator
Generate cryptographically random bytes in hex, base64, or decimal — fully offline
ANSI Color Code Converter
Convert any hex color to the nearest ANSI 256-color terminal code and escape sequence.
Base16 (Hex) Encoder/Decoder
Encode raw bytes as RFC 4648 uppercase hex pairs
Binary to Hex Converter
Translate base-2 binary strings directly into hexadecimal
Color Invert (Complementary) Tool
Find the exact color inverse by subtracting from white
Color Mix Calculator
Calculate the resulting RGB color when mixing two colors
Color Opacity / Alpha Mixer
Preview a semi-transparent color over a white or black background
Color Temperature to RGB Converter
Convert blackbody color temperature in Kelvin to RGB
Color to CSS filter() Converter
Generate a CSS filter string to recolor a black SVG/PNG to any color
Windows-1252 Hex Dump
Show each character's Windows-1252 (CP1252) code point in hex
CSS Gradient Color Extractor
Extract all color stops from a CSS linear or radial gradient
CSS hsl() / oklch() String Builder
Build valid CSS hsl() or oklch() color function strings
Hex Color Code Text Encoder
Encode text bytes as CSS hex color codes
CSS Hex Shorthand Expander
Expand 3-digit CSS hex shorthand (#F80) to full 6-digit form
Hex Text Converter
Convert text to hex bytes and hex back to text
Hex to Binary Converter
Expand hexadecimal values into full binary bit strings
Hex to Nearest CSS Named Color
Find the closest CSS named color to any hex value
3-Digit to 6-Digit Hex Color Expander
Expand shorthand CSS
Hex8 (RGBA Hex) Alpha Converter
Convert 8-digit hex colors (#RRGGBBAA) including alpha channel
Hexspeak Word Encoder
Write messages using hex-readable words: DEADBEEF, CAFEBABE
HSL to Hex Converter
Convert HSL color values to a CSS hex code
CIE L*a*b* to RGB Color Converter
Convert CIELAB perceptual colors back to sRGB
Leet Hex Encoder
Encode text to leetspeak then show hex byte values
Material Design Color Lookup
Find the closest Material Design 3 color token to any hex value
CSS Named Color to Hex Converter
Look up any CSS named color and get its hex code
Octal to Hex Converter
Convert base-8 octal values to hexadecimal
Oklch to RGB Converter
Convert Oklch lightness/chroma/hue back to sRGB
Pantone to RGB Approximator
Look up approximate RGB values for common Pantone spot colors
RAL Color to Hex Converter
Convert RAL paint/coatings codes to approximate hex colors
Binary/Hex Encoder
Convert text to binary, hex, and base64
Tailwind CSS Gradient Class Generator
Tailwind gradient utility class combinations
RGB to CMYK Color Converter
Convert screen RGB colors to the CMYK print model
RGB to Grayscale Converter
Convert any color to greyscale using luminance weighting
Batch RGB to HSL Converter
Convert a list of RGB values to HSL all at once
RGB to CIE L*a*b* Color Converter
Convert RGB to the perceptually uniform CIELAB color space
RGB to LCH Color Converter
Convert RGB to CIELCh (lightness, chroma, hue) cylindrical space
RGB to Oklab Color Converter
Convert RGB to the Oklab perceptually uniform color space
RGB to Oklch Color Converter
Convert RGB to the perceptually uniform Oklch color space
sRGB to Display P3 Converter
Convert sRGB colors to wide-gamut Display P3 color space
RGB to Tailwind Color Matcher
Find the closest Tailwind CSS palette color to any RGB value
RGB to CIE XYZ Color Converter
Convert sRGB colors to the CIE XYZ tristimulus color space
Hex to CSS rgba() String Converter
Turn a hex color plus opacity into a ready-to-paste CSS rgba() function string.
Tailwind Color Config Generator
Custom Tailwind CSS color scale configurations
Tailwind Color Name to Hex
Look up the hex code of any Tailwind CSS color by name
UTF-16 Hex Viewer
Show UTF-16 LE and BE byte sequences for any Unicode text
UTF-32 Hex Viewer
Show each Unicode code point as a 4-byte UTF-32 hex value
CIE XYZ to RGB Color Converter
Convert CIE XYZ tristimulus values back to sRGB
Hex to Text Converter
Convert hex bytes to text and text to hex — UTF-8, in your browser.
WCAG Color Contrast Checker
Check text and background colors against WCAG AA and AAA contrast ratios.
Decimal to Hex Converter
Convert any whole number to hexadecimal, with optional 0x prefix.
Hex to Decimal Converter
Turn any hexadecimal value into its base-10 number.
Hex to RGB Converter
Turn any hex colour code into an RGB value instantly.
RGB to Hex Converter
Convert RGB channel values into a hex colour code.
RGB to HSL Converter
Convert RGB colour values into hue, saturation and lightness.
HSL to RGB Converter
Convert hue, saturation and lightness into RGB values.
Hex to CMYK Converter
Convert a hex colour code into CMYK for print work.
Color Name to Hex Converter
Look up the hex code for any CSS named colour.
CSS Gradient Generator
Build linear and radial CSS gradients with a live preview and copy-ready code.
Complementary Color Finder
Find complementary, analogous, triadic and tetradic colour harmonies.
Color Blindness Simulator
See how a colour looks with protanopia, deuteranopia and tritanopia.
Random Color Palette Generator
Generate harmonious 5-colour palettes with copy-ready hex and CSS.
RGB to HSV Converter
Convert RGB colour values into hue, saturation and value.
CMYK to RGB Converter
Convert print CMYK percentages into screen RGB values.
Hex to HSL Converter
Convert a hex colour code into hue, saturation and lightness.
RGBA to Hex Converter
Convert RGBA colour with alpha into an 8-digit hex code.
HSV to RGB Converter
Convert hue, saturation and value into RGB colour values.
Contrast Grid Checker
WCAG contrast ratios for every colour pair in your palette, at a glance.
Monochrome Palette Generator
Build a cohesive single-hue palette from one base colour.
Analogous Color Finder
Find harmonious neighbour colours on the colour wheel.
Color Temperature Converter (Kelvin to RGB)
Turn a Kelvin colour temperature into an approximate sRGB colour.
Pantone to Hex (Approximate)
Look up an approximate screen hex for a Pantone PMS coated colour.
Hex to Pantone (Approximate)
Find the closest Pantone PMS coated colours to any hex value.
Color Mixer (Blend Two Colors)
Blend two colours at any ratio — gamma-correct or simple sRGB.
Triadic Color Scheme Generator
Build a balanced triadic palette — three hues 120° apart.
CSS Gradient Generator (Pro)
Build multi-stop linear, radial and conic CSS gradients visually, then copy the code.
CSS Text Gradient Generator
Create gradient-filled text and copy the CSS.
CSS Color Names List
All CSS named colors with hex and RGB — searchable.
CSS Conic Gradient Generator
Build colour wheels, pie charts and angular sweeps with a draggable conic editor.
Color Contrast Checker
Check WCAG contrast ratio for two colors with live AA/AAA pass-fail.
Color Format Converter
Convert a colour between HEX, RGB, HSL and HWB live — with a picker and alpha.
Color Scale Builder
Generate an even, multi-stop colour ramp with CSS, JSON and SVG export.
CSS Color Names
Searchable list of every named CSS colour with swatch, hex, rgb and hsl.
WCAG Contrast Checker
Instant AA/AAA contrast ratio check with sRGB-accurate maths and fix suggestions.
Hex to RGBA Converter
Instantly convert any hex colour to rgba(), rgb(), HSL, CSS variables and Tailwind classes.
Color Contrast Ratio Checker
Calculate the exact WCAG contrast ratio with full step-by-step formula working.
CSS & Frontend
Favicon Generator
Create favicon PNGs in all sizes — 16 to 512 px — right in your browser.
robots.txt Validator
Validate a robots.txt file and test URL matching against user-agents
CSS Variable Theme Generator
Complete CSS custom property themes for design systems
CSS Grid System Generator
Custom CSS grid configurations for layouts
Lat/Lng to UTM Converter
Convert geographic coordinates to UTM zone, easting and northing
CSS Class Name Generator
BEM and utility-style CSS class names
UTM to Lat/Lng Converter
Convert UTM zone, easting and northing back to decimal lat/long
robots.txt Generator
Generate a robots.txt with allow, disallow, crawl-delay and sitemap.
Meta Tags Generator
Generate SEO, Open Graph and Twitter Card meta tags for any page.
CSS Specificity Calculator
Calculate the specificity of any CSS selector as an (a, b, c) score.
CSS Minifier
Compress stylesheets by stripping comments and whitespace.
CSS Flexbox Cheatsheet
Every flexbox property, grouped and searchable — copy any one-liner.
CSS Grid Cheatsheet
Every CSS grid property, grouped and searchable — copy any one-liner.
CSS Properties Reference
Common CSS properties grouped by purpose and searchable.
CSS Border Radius Generator
Round corners individually or together with a live preview.
CSS Transform Generator
Combine translate, rotate, scale and skew with a live preview.
CSS Filter Generator
Blur, brightness, contrast, grayscale, sepia and more — live preview.
CSS Clip-Path Generator
Polygon clip-path shapes — triangles, hexagons, stars and custom.
CSS Glassmorphism Generator
Frosted-glass cards with backdrop-filter blur, tint and border.
Cubic Bezier Generator
Drag the curve to craft custom cubic-bezier() easing for CSS.
CSS Animation Keyframes Generator
Fade, slide, bounce, spin and shake @keyframes with live preview.
Favicon Kit Generator
Turn one image into a complete favicon set — ICO, PNGs, manifest and zip.
Spreadsheet Lite — Online Grid with Formulas
A fast browser spreadsheet with SUM/AVG formulas and CSV + XLSX import & export.
UTM Link Builder
Build tagged campaign URLs with utm_source, utm_medium and more.
Canonical URL Builder
Normalise a URL and build its rel=canonical tag.
CSS Grid Generator
Build a CSS grid layout visually and copy the code.
CSS Flexbox Playground
Experiment with flexbox properties and copy the CSS.
CSS Triangle Generator
Make CSS triangles with the border trick and copy the code.
CSS Scrollbar Styler
Style custom scrollbars and copy cross-browser CSS.
CSS Variables Generator
Build a :root block of CSS custom properties and copy it.
CSS Unit Converter
Convert between px, rem, em, pt, pc and physical CSS units.
CSS Animation Builder
Multi-stop @keyframes editor with a live preview and copy-ready CSS.
CSS clamp() Generator
Turn min/max sizes and a viewport range into a responsive clamp() value.
CSS Aspect Ratio and object-fit Helper
Visualize aspect ratios and object-fit, then copy ready-to-paste CSS.
Cubic Bezier Easing Editor
Drag, preview and export cubic-bezier() easing curves for CSS.
CSS Grid Layout Builder
Paint named template areas, size every track, copy grid-template CSS.
Border Radius Generator (Elliptical, Per-Corner)
Design rounded and elliptical corners with live preview and copy-ready CSS.
Flexbox Playground
Visually build a CSS flexbox layout and copy the exact HTML and CSS.
CSS Formatter & Minifier
Beautify, minify and tidy CSS in your browser — sort properties, shorten hex, copy.
CSS Pattern Generator
Build repeating geometric backgrounds — stripes, dots, grids, checks — and copy the CSS.
Robots Meta Tag Generator
Generate correct robots meta tags with indexing, follow and snippet controls.
Sitemap URL Counter
Paste any sitemap.xml and instantly count every URL with full metadata analysis.
Canonical Tag Checker
Validate your canonical link tag and catch canonicalisation errors instantly.
Generators
Barcode Generator (EAN / Code 128 / Code 39 / UPC)
Generate EAN-13, UPC-A, Code 39, and Code 128 barcodes as scalable SVG.
Unified Diff to Patch File Generator
Create a .patch file from two pasted text versions, with line context.
CSP Nonce Generator
Generate cryptographically random nonces for Content Security Policy script/style tags
Password Strength Checker
Estimate password entropy, detect weak patterns, and see time-to-crack — locally.
SSH Key Pair Generator
Generate Ed25519 or RSA SSH key pairs entirely in your browser.
CHANGELOG Entry Generator
Keep-a-changelog format release notes
Fake Address Generator (Australia)
Valid-format Australian addresses for testing
Fake Address Generator (Brazil)
Brazilian addresses with CEP and state codes
Fake Address Generator (Canada)
Realistic Canadian addresses for QA and demos
Fake Address Generator (France)
French addresses with valid postal codes
Fake Address Generator (Germany)
German addresses with correct PLZ format
Fake Address Generator (India)
Indian addresses with PIN codes and states for testing
Fake Address Generator (Japan)
Japanese addresses in kanji and romaji formats
Fake Address Generator (Spain)
Spanish addresses with province and postal codes
Fake Address Generator (UK)
Plausible UK addresses with valid postcodes
Fake Address Generator (US)
Realistic US addresses for testing and forms
Fake Analytics Dashboard Data Generator
Realistic web analytics data for dashboard demos
Audit Log Entry Generator
Fake audit trail entries for compliance tool demos
Fake Background Check Result Generator
Fictional background check summaries for HR demos
Fake Certificate Thumbprint Generator
SHA-1 and SHA-256 thumbprint format strings
CI Pipeline Output Generator
Fake CI/CD build log output for tool demos
Fake Company Generator
Fictional company names and details for demos
Fake Company Registration Number Generator
Company number format stubs for business tool demos
Fake Contract Clause Generator
Fictional legal clause text for legal tool demos
Random GPS Coordinates Generator
Valid latitude/longitude pairs for geospatial testing
Fake Credit Card Generator (Test)
Luhn-valid test card numbers, never real cards
CRM Contact Record Generator
Fake contact records for CRM tool demos
Fake Crypto Portfolio Generator
Fictional crypto holdings for wallet app demos
Fake DOI Generator
DOI-format identifiers for academic tool testing
Fake Email Generator
Disposable-style fake emails for test data
Fake Git Commit History Generator
Synthetic git log output for tool demos
Fake IBAN Generator (Test)
Valid-format IBAN numbers for testing bank flows
Fake ISBN Generator
Check-digit-valid ISBN-13 strings for book demos
Fake UK License Plate Generator
DVLA-format number plates for UK auto apps
Fake US License Plate Generator
State-format license plates for automotive apps
Fake LinkedIn Profile Generator
Professional profile data for B2B tool mockups
Markdown Document Generator
Fake documents with all Markdown elements
Fake Medical Record Generator
Anonymized fake patient records for health demos
NPS Survey Data Generator
Net Promoter Score datasets for analytics demos
Fake Order History Generator
Synthetic order data for e-commerce app demos
Fake Passport Number Generator
Country-specific passport number format stubs
Fake Person Profile Generator
Complete fictional identity for testing and demos
International Fake Phone Number Generator
Country-code formatted test phone numbers worldwide
Fake UK Phone Number Generator
UK phone numbers in Ofcom-reserved drama ranges
Fake US Phone Number Generator
NANP-format US phone numbers for safe testing
Fake Purchase Order Generator
Fictional POs for procurement tool testing
SaaS Subscription Record Generator
Fake subscription data for SaaS analytics demos
Fake Sensor Log Generator
Simulated sensor log files for IoT testing
Fake Social Media Stats Generator
Believable follower and engagement counts for mockups
Fake SSH Key Fingerprint Generator
MD5 and SHA-256 SSH fingerprint format strings
Fake SSN Generator (US Test Format)
Invalid-by-design SSN-format strings for testing
Fake Stock Price Generator
Fictional ticker symbols and price history
Support Ticket Generator
Fake customer support tickets for helpdesk demos
Survey Response Dataset Generator
Fake survey response datasets for analytics demos
Fake Terraform Plan Output Generator
Simulated Terraform plan output for IaC demos
Fake Time-Series Data Generator
Synthetic time-series datasets for charting demos
Fake Twitter/X Profile Generator
Fictional social profile data for UI mockups
Fake VAT Number Generator
EU VAT number format strings for tax tool testing
Fake Vehicle VIN Generator
Check-digit-valid VIN strings for auto testing
Webhook Payload Generator
Realistic webhook event payloads for testing
.htaccess Generator
Apache .htaccess rules for redirects and security
IP Address Generator
Random IPv4 and IPv6 addresses for testing
MAC Address Generator
Valid random MAC addresses for network testing
Mock .env File Generator
Fake environment variable files for dev setup
Mock GraphQL Response Generator
Fake GraphQL query responses for frontend dev
N-gram Generator
Extract character and word n-grams from any text.
TOTP Secret Generator
Base32 OTP secrets for authenticator apps
Placeholder Name Generator (Mx. / Gender-Neutral)
Gender-neutral placeholder names for inclusive demos
Random API Response Generator
Fake REST API JSON responses for frontend mocking
AWS Resource Name Generator
Naming-convention-compliant AWS resource identifiers
Random Blog Post Generator
Fake blog post stubs for CMS and content demos
Random Calendar Event Generator
Fake calendar events for scheduling tool demos
Random Chat Message Generator
Fake chat conversations for messaging app demos
Random Git Commit Message Generator
Conventionally-formatted fake commit messages
Cron Expression Generator
Valid cron schedule expressions with human description
Random Currency Code Generator
ISO 4217 currency codes for finance testing
D3.js Sample Data Generator
Ready-to-use sample data for D3 chart types
Database Name Generator
Professional database and schema name suggestions
Design Token Set Generator
Complete design token collections for design systems
Docker Tag Generator
Versioned Docker image tags for CI pipelines
E-commerce Product Review Generator
Realistic fake product reviews for shop demos
Election Result Generator
Fictional election results for civic tech demos
Random Error Message Generator
Fake error messages for QA and UI testing
Application Error Code Generator
Structured error codes for API and app error systems
Analytics Event Name Generator
Consistent analytics event names for tracking plans
Feature Flag Name Generator
Consistent flag names for feature toggle systems
Flight Data Generator
Fake flight listings for travel app mockups
Forum Post Generator
Fake forum threads and replies for community demos
GitHub Repository Name Generator
Kebab-case repo names for your next project
Heatmap Data Generator
Matrix data for heatmap chart visualizations
Hotel Listing Generator
Fake hotel listings for travel platform demos
Random HTTP Header Generator
Standard HTTP header name-value pairs
Random HTTP Status Code Generator
HTTP status codes with explanation and use case
Random Invoice Generator
Fake invoice data for accounting tool mockups
Random Job Posting Generator
Fake job descriptions for HR and recruiting tools
Kanban Board Data Generator
Fake kanban card data for PM tool prototypes
Kubernetes Resource Name Generator
DNS-compliant Kubernetes resource names
Random Locale Code Generator
BCP-47 locale codes for i18n testing
Random MIME Type Generator
IANA MIME type strings for file handling tests
Network Graph Data Generator
Node and edge data for network graph demos
News Feed Data Generator
Fake news article feeds for app mockups
Random Push Notification Generator
Fake push notifications for mobile app mockups
npm Package Name Generator
Valid npm package names for your next library
Open Graph Meta Tags Generator
og: meta tag snippets for social sharing previews
Org Chart Data Generator
Hierarchical team structures for HR app demos
Password Policy Generator
Password policy rule sets for security configs
Permission Scope Name Generator
OAuth-style scope strings for auth systems
Privacy Policy Clause Generator
Plain-language privacy policy clauses for demos
Random Product Review Generator
Fake product reviews for e-commerce mockups
Project Timeline Generator
Fake project milestones for PM tool demos
Random Regex Pattern Generator
Common regex patterns for validation tasks
Semantic Version Generator
Valid semver version strings for package releases
Social Media Feed Generator
Fake social timeline posts for UI mockups
Sports Score Generator
Realistic fake scores for sports app mockups
Random Tech Stack Generator
Random technology stack combos for side projects
Terms of Service Clause Generator
ToS clause stubs for legal document tool demos
Random Timezone Generator
Random IANA timezone identifiers for testing
Tree Structure Data Generator
Hierarchical JSON trees for visualization demos
Two-Factor Backup Code Generator
2FA backup code sets for auth system testing
Random User Agent Generator
Realistic browser user-agent strings for testing
Random Variable Name Generator
Context-appropriate variable name suggestions
Weather Data Generator
Fake weather readings for climate app demos
Word Cloud Data Generator
Frequency-weighted word lists for word cloud tools
README Badge Generator
Shields.io-style badges for GitHub README files
Recovery Codes Generator
Backup recovery codes for 2FA systems
Password Salt Generator
Random cryptographic salts for password hashing
Sample E-commerce Dataset Generator
Fake product catalog data for shop demos
Sample Finance Dataset Generator
Fake transaction and account data for fintech demos
Sample Healthcare Dataset Generator
Anonymized fake patient records for health-tech demos
Sample HR Dataset Generator
Fake employee records for HRIS tool demos
Sample IoT Sensor Dataset Generator
Fake time-series sensor readings for IoT demos
Spacing Scale Generator
Consistent spacing scales for design systems
Secure Token Generator
Cryptographically random tokens for auth systems
Word Frequency List Generator
Generate a Zipf-distributed word frequency list of any size.
.gitignore Generator
Build a .gitignore from language, OS and editor templates.
URL Slug Generator
Turn any title into a clean, SEO-friendly URL slug.
Random PIN Generator
Generate secure random numeric PINs of any length, right in your browser.
Pronounceable Password Generator
Create strong passwords you can actually say and remember.
API Key Generator
Generate secure random API keys in hex, base62 or base64url, with an optional prefix.
htpasswd Generator
Create Apache/Nginx .htpasswd entries with APR1 (MD5) or SHA-1 hashing.
Random Username Generator
Generate memorable usernames from random adjectives and nouns.
Strong Passphrase Generator
Build memorable, high-entropy passphrases from random words.
Random Date Generator
Generate random dates within any range and format.
Modular Scale Generator
Build a harmonious type scale from a base size and ratio.
Design Tokens Generator
Turn a base colour into a full tint/shade ramp and exportable design tokens.
Test Credit Card Number Generator
Luhn-valid fake card numbers for sandbox & form testing.
Random MAC Address Generator
Valid random MAC addresses in any format — colon, hyphen, Cisco.
Random IP Address Generator
Random IPv4 & IPv6 addresses, public-only option included.
Random User Generator
Fake people with name, email, phone & address for test data.
Mock Data Generator
Define typed fields, generate thousands of realistic rows, export JSON, CSV or SQL.
Password Entropy Calculator
Measure password strength in bits and estimated time to crack.
Dockerfile Generator
Build a clean, cache-friendly Dockerfile from a stack preset — copy or download.
Nginx Config Generator
Build a production-ready nginx server block from simple options.
Advanced Password Generator
Cryptographically random passwords with a live entropy and strength meter.
Slugify Tool — Text to URL Slug Generator
Turn any title into a clean, URL-safe slug with full control.
India PIN Code Validator
Instantly check whether an Indian PIN code is structurally valid.
Philippines Phone Number Validator
Validate any Philippine mobile or landline number — network, area code and E.164 format.
Open Graph Preview Generator
See exactly how your link card looks on Facebook, Twitter, Slack, and Discord before you publish.
Hreflang Tag Generator
Generate correct hreflang tags for every international page in seconds.
URL Slug Generator for SEO
Turn any page title into a clean, search-engine-friendly URL slug instantly.
Formatters & Minifiers
PEM Private Key Format Validator
Paste a PEM key to verify its type and structure without transmitting it
Coordinate Format Converter
Convert between decimal degrees, DMS, DDM, UTM, and Geohash
JavaScript Formatter / Beautifier
Format minified or messy JavaScript with clean indentation in the browser
JavaScript Minifier
Minify JavaScript by stripping comments and whitespace — no upload
Nginx Config Formatter
Format and validate Nginx configuration files in your browser
Terraform HCL Formatter
Format Terraform .tf HCL files with canonical indentation in your browser
Coordinate Formatter (Multi-format)
Display one coordinate in DD, DMS, DDM, UTM, and MGRS simultaneously
India GSTIN Validator
Validate a 15-character GSTIN — state code, PAN and base-36 check digit.
HTML Formatter & Minifier
Pretty-print or minify HTML in your browser — nothing is uploaded.
JavaScript Minifier
Strip comments and whitespace to shrink your JS.
HTML Minifier
Shrink HTML by removing comments and collapsing whitespace.
ISO 8601 Date Formatter
Format any date as a standards-compliant ISO 8601 string.
Reference & Cheatsheets
Regex Tester with Plain-English Explainer
Test regular expressions live and see them explained in plain English.
Regex Builder & Tester
Build, test and debug regular expressions with live match highlighting.
HTTP Status Code Reference & Security Implications
Look up any HTTP status code with security and caching implications explained
HAR to cURL Commands Converter
Convert HTTP Archive requests to copy-pasteable cURL commands.
MIME Type Inspector & Security Risk Checker
Enter a MIME type or file extension and get security, sniffing, and CSP guidance
MIME Type Lookup & File Extension Map
Look up MIME type from extension or extension from MIME type
Regex Redaction Tester
Write a redaction regex, test it against sample text, and see matched and missed spans
ASCII Code Table Lookup
Look up any ASCII character by code or letter
HTTP Status Codes Reference
Every HTTP status code with its meaning — searchable and instant.
MIME Types Reference
Look up the right Content-Type for any file extension — searchable.
Git Commands Cheatsheet
The everyday Git commands, grouped and searchable — copy any one.
Linux Commands Cheatsheet
The everyday Linux terminal commands, grouped and searchable — copy any one.
Docker Commands Cheatsheet
The everyday Docker commands, grouped and searchable — copy any one.
Regex Replace Tool
Find and replace with regular expressions and capture groups.
ISO Country Codes Reference
Look up ISO 3166-1 alpha-2, alpha-3 and numeric country codes.
ISO Currency Codes Reference
Look up ISO 4217 currency codes, numbers and minor units.
International Calling Codes Reference
Find the international dialling (country) code for any country.
Time Zone List Reference
Browse IANA time zone names and their UTC offsets.
ISO Language Codes Reference
Look up ISO 639-1 and 639-2 language codes and native names.
HTML Tags Reference
Every common HTML element grouped and searchable.
File Extensions Reference
Common file extensions and what they mean — searchable.
Port Numbers Reference
Well-known TCP and UDP ports and their services — searchable.
Emoji Shortcodes Reference
GitHub and Slack emoji shortcodes — searchable, click to copy.
DNS Record Types Reference
Searchable list of DNS record types — A, AAAA, CNAME, MX, TXT and more.
Regex Syntax Reference
Searchable cheat sheet of regular-expression tokens, quantifiers and flags.
Markdown Syntax Reference
Searchable cheat sheet of Markdown syntax — headings, emphasis, lists, links and code.
Vim Commands Cheat Sheet
Searchable cheat sheet of Vim commands — modes, motion, editing, search and files.
Unicode Blocks Reference
Common Unicode blocks with their code-point ranges and contents.
HTTP Methods Reference
GET, POST, PUT and the rest — safe, idempotent, cacheable.
ASCII Control Codes Reference
The 33 ASCII control characters — abbr, caret and escape.
HTTP Status Codes Reference
Searchable list of HTTP status codes with meaning and when to use each.
ASCII Table Reference
Every ASCII code in decimal, hex, octal, binary and HTML entity — searchable, click-to-copy.
MIME Type Finder
Look up the MIME type for any file extension — or vice versa.
HTTP Headers Reference
Searchable list of HTTP request and response headers with purpose, example and direction.
Regex Cheatsheet & Tester
A categorized regex token reference plus a live, highlighting tester.
Git Command Builder
Pick an action — branch, stash, undo, rebase — and get the exact git command plus a plain-English explanation.
ID & Number Validators
IP Address Type & Privacy Checker
Classify any IPv4/IPv6 address as public/private/loopback/reserved/documentation
SPF Record Builder & Syntax Checker
Build a valid SPF TXT record from a guided UI and validate the syntax offline
Clipboard Contents Security Checker
Read your clipboard (with permission) and scan it for secrets, tokens, and PII before you paste
CORS Header Explainer & Validator
Paste CORS response headers and get a plain-English breakdown of what they allow
Data URI Inspector & Security Checker
Decode any data URI and flag potentially dangerous MIME types or obfuscated payloads
Folder Listing Diff
Paste two directory listings and find files added, missing, or renamed
HSTS Header Checker
Paste a Strict-Transport-Security header and verify max-age, subdomains, and preload
Luhn Algorithm Checker
Validate card numbers with the Luhn mod-10 check and generate test numbers.
OpenAPI / Swagger Spec Validator
Validate an OpenAPI 3.x or Swagger 2.0 YAML or JSON spec in your browser.
API Rate-Limit Header Calculator
Design a rate-limiting policy and preview the X-RateLimit headers it would produce.
RSS / Atom Feed Validator
Validate a pasted RSS 2.0 or Atom 1.0 feed for spec compliance
Same-Origin Policy Checker & Explainer
Enter two URLs and instantly see whether they share an origin, with a full explanation
Damm Algorithm Checker
Validate numbers using the Damm totally antisymmetric quasigroup
EAN-13 / UPC-A Barcode Validator
Validate EAN-13 and UPC-A barcodes and compute check digits
IMEI Number Validator
Validate mobile device IMEI numbers via Luhn algorithm
ISBN-10 to ISBN-13 Converter
Convert any valid ISBN-10 to its ISBN-13 equivalent
ISBN-10 Validator & Check Digit
Validate ISBN-10 and compute missing check digits
ISBN-13 Validator & Check Digit
Validate ISBN-13 (EAN-13) and compute missing check digits
ISO-8859-2 / Latin-2 Encoder
Show Central European Latin-2 byte values for text in hex
ISO-8859-1 / Latin-1 Encoder
Encode text to an ISO-8859-1 byte sequence shown as hex
Luhn Algorithm Checker
Validate credit card numbers and IMEI via Luhn mod-10
Verhoeff Checksum Checker
Validate digits using the dihedral group Verhoeff algorithm
Text Diff Checker
Compare two blocks of text line by line and highlight every change.
Luhn Algorithm Checker
Validate any number with the Luhn (mod-10) checksum.
IBAN Validator
Check any IBAN with the ISO 13616 mod-97 algorithm.
Credit Card BIN Checker
Identify the card network from a BIN / IIN prefix.
EU VAT Number Validator
Check the format of any EU VAT number — all 27 member-state patterns.
UK VAT Number Validator
Verify a UK VAT number's check digit with HMRC's mod-97 algorithm.
Australian ABN Validator
Check an 11-digit ABN with the ATO's mod-89 checksum algorithm.
ISBN Validator
Validate ISBN-10 and ISBN-13 check digits and convert between them.
Semver Range Checker
Check whether a version satisfies an npm semver range like ^1.2.0.
Russia INN Validator
Check a Russian INN (10 or 12 digit) check digits — in your browser.
Ukraine INN Validator
Decode a Ukrainian tax number (RNOKPP) — date, gender and checksum.
Serbia JMBG Decoder
Decode a Serbian JMBG — date of birth, region, gender and checksum.
Austria SVNR Validator
Decode an Austrian social-security number — date and check digit.
Meta Title Length Checker
Check title-tag length in characters and approximate SERP pixels.
Keyword Density Checker
Count word frequency and density in any text to avoid keyword stuffing.
IEEE 754 Floating-Point Converter
Decimal to IEEE 754 single and double precision bits.
Credit Card Validator
Luhn checksum plus card-brand detection — all in your browser.
India PAN Validator — Check Every Rule in Your PAN
Validate all structural rules in an Indian PAN and decode every embedded field.
Poland PESEL Validator
Verify any Polish PESEL number — checksum, birth date, gender, century.
India Aadhaar Number Validator
Verify any 12-digit Aadhaar with a full Verhoeff checksum and step-by-step trace.
Brazil CNPJ Validator
Verify Brazilian company ID numbers with the real two-step mod-11 algorithm.
Croatia OIB Validator
Verify a Croatian OIB with the ISO 7064 MOD 11,10 check digit — and see every step.
Brazil CPF Validator
Validate a CPF with real MOD-11 check digits, see the algorithm step by step, and decode the embedded fiscal region.
Canada SIN Validator — Social Insurance Number Checker (Luhn)
Validate a Canadian SIN with the Luhn checksum and read its province or temporary-resident flag.
Czech Rodné číslo Validator
Validate a Czech birth number and decode its hidden birth date and gender.
Denmark CPR Number Validator
Validate a Danish CPR number — date, serial, century, gender and legacy mod-11 check.
Estonia Isikukood Validator
Verify an Estonian personal ID code — control digit, birth date and gender decoded instantly.
Finland HETU Validator
Validate a Finnish henkilötunnus with the full DVV mod-31 algorithm.
Ireland PPS Number Validator
Validate an Irish PPSN with full modulo-23 check-character verification and step-by-step working.
Italy Codice Fiscale Validator
Validate an Italian tax code with full checksum verification and decoded birth data.
Norway Fødselsnummer Validator
Validate a Norwegian national ID number with full mod-11 checksum verification.
South Korea RRN Validator
Verify a Korean Resident Registration Number with the real mod-11 check-digit algorithm.
Spain DNI / NIE Validator
Verify a Spanish DNI or NIE in one click — control letter, mod-23 algorithm explained.
Sweden Personnummer Validator
Validate a Swedish personal identity number and extract birth date, gender and county.
Romania CNP Validator
Validate a Romanian CNP and decode birth date, gender and county.
Bulgaria EGN Validator
Validate a Bulgarian EGN with weighted-checksum verification and birth-date + region extraction.
Lithuania Asmens Kodas Validator
Verify any Lithuanian personal code and extract birth date, gender and century.
Mexico CURP Validator
Verify any 18-character CURP with the real RENAPO check-digit algorithm and decode birth date, gender and state.
Albania NID Validator
Validate an Albanian Personal Number (NUP) and read its embedded birth date, gender and citizen type.
Colombia NIT Validator
Compute and verify the DIAN check digit for any Colombian NIT.
Iceland Kennitala Validator
Verify an Icelandic kennitala with the official Lund weighted mod-11 check digit.
Taiwan National ID Validator
Verify a ROC National ID number and decode its embedded district and gender.
Germany Personalausweis Document-Number Validator
Verify the 9-character German national ID document number using the ICAO 9303 check-digit algorithm.
Malaysia MyKad Validator
Validate a 12-digit MyKad number: date, place of birth, gender and serial.
North Macedonia EMBG Validator
Validate a Macedonian EMBG and decode birth date, gender and region.
Serbia JMBG Validator
Validate a Serbian JMBG number with full modulo-11 checksum and decoded fields.
Slovenia EMŠO Validator
Verify any Slovenian EMŠO number and decode its birth date, gender, and region.
Ukraine RNOKPP Validator
Verify a Ukrainian tax number and decode its embedded birth date, gender and checksum.
Uruguay CI Validator
Verify the check digit on a Uruguayan Cédula de Identidad instantly.
Argentina CUIL Validator
Verify an Argentine CUIL with the ANSES mod-11 checksum and decode the type prefix.
Egypt National ID Validator
Validate a 14-digit Egyptian National ID and decode its birth date, governorate and gender.
Greece AMKA Validator
Validate a Greek social security number with the full Luhn checksum algorithm.
Kazakhstan IIN Validator
Validate a Kazakhstan IIN with two-pass checksum verification and birth-date, gender and century extraction.
Morocco CIN Validator
Validate a Moroccan national ID number and decode the issuing bureau.
Thailand National ID Validator
Verify a 13-digit Thai national ID against the official DOPA check-digit formula.
Netherlands BSN Validator
Verify a Dutch Burgerservicenummer with the full elfproef (11-test) breakdown.
Portugal NIF Validator
Validate a Portuguese NIF with mod-11 check digit — see WHY it passes or fails.
Canada Postal Code Validator
Instantly check whether a Canadian postal code is structurally valid.
France Phone Number Validator
Validate any French phone number against the ARCEP national plan — instantly, in your browser.
Germany Postcode Validator
Instantly validate any German PLZ and identify its federal state and region.
Austrian IBAN Validator
Instantly validate any Austrian IBAN — BLZ, account number and ISO 7064 checksum.
Belgian IBAN Validator
Verify a Belgian IBAN with ISO mod-97 and the national check digits.
Danish IBAN Validator
Instantly verify any Danish bank account number in IBAN format.
German IBAN Validator
Validate a German IBAN with ISO 7064 MOD-97, BLZ structure and Kontonummer checks.
Italian IBAN Validator
Validate any Italian IBAN instantly — CIN, ABI, CAB and MOD-97 checksum checked.
Luxembourg IBAN Validator
Instantly verify any Luxembourg IBAN against the ISO 7064 MOD-97-10 standard.
Norwegian IBAN Validator
Validate any Norwegian IBAN with Modulus-11 and ISO 7064 checks.
Polish IBAN Validator (NRB)
Validate any Polish IBAN instantly — checksum, bank code and branch decoded.
Saudi Arabia IBAN Validator
Instantly verify any SA IBAN against ISO 7064 MOD-97 and the SAMA bank-code registry.
Swedish IBAN Validator
Instantly verify any Swedish bank account number in IBAN format — ISO 7064 checksum, clearing number and bank name included.
Netherlands Postcode Validator
Instantly check whether a Dutch postcode is structurally valid.
Pakistan Phone Number Validator
Verify any Pakistani mobile or landline number — format, operator, city.
UK Phone Number Validator
Instantly check if a UK phone number is valid, identify its service type and get the correct formatted versions.
US Phone Number Validator
Instantly check whether a US phone number is structurally valid under NANP rules.
US ZIP Code Validator
Validate any US ZIP-5 or ZIP+4 code with prefix-range and state lookup.
France Postcode Validator
Validate any French postcode (code postal) and instantly identify the department and region.
Netherlands IBAN Validator
Verify any Dutch IBAN with the full NL BBAN structure check and ISO 7064 MOD-97 algorithm.
Australia Phone Number Validator
Validate any Australian phone number against the ACMA Numbering Plan — mobile, geographic, freecall and more.
Bangladesh Phone Number Validator
Instantly check any Bangladeshi mobile number format and identify the operator.
Brazil CEP Validator
Validate a Brazilian postal code, decode its state and macro-region, and classify the suffix type — all offline.
Germany Phone Number Validator
Validate any German phone number — landline, mobile, or service number — and get the correct E.164 format instantly.
Greek IBAN Validator
Validate any Greek IBAN instantly — bank code, branch code and MOD-97 checksum verified.
Irish IBAN Validator
Validate an Irish IBAN with full MOD-97 checksum verification and BBAN structure breakdown.
Swiss IBAN Validator
Validate a Swiss IBAN with ISO 7064 MOD-97, IID structure and account format checks.
Indonesia Phone Number Validator
Validate any Indonesian mobile or landline number against the BRTI numbering plan.
Japan Postal Code Validator
Validate any Japanese 7-digit postal code and identify its prefecture instantly.
Kenya Phone Number Validator
Instantly check any Kenyan phone number format, operator and E.164 form.
Nigeria Phone Number Validator
Instantly check if a Nigerian phone number is valid and identify the network operator.
South Africa Phone Number Validator
Instantly validate and format any South African phone number — local, E.164 or +27 prefix.
UK Postcode Validator
Instantly check any UK postcode against the Royal Mail format spec and see the area, district, sector and unit breakdown.
Portugal IBAN Validator
Validate a Portuguese IBAN with ISO mod-97 + Banco de Portugal local check digits.
Australia Postcode Validator
Check any 4-digit Australian postcode against the Australia Post Addressing Standard — state, delivery type and allocation confirmed instantly.
Brazil Phone Number Validator
Validate any Brazilian phone number against ANATEL E.164 rules — area code, mobile 9th digit, and line type decoded instantly.
Egypt Phone Number Validator
Instantly verify any Egyptian phone number and identify the mobile operator or governorate.
French IBAN Validator
Verify a French IBAN with the RIB key check and ISO 7064 mod-97.
UAE IBAN Validator
Verify any United Arab Emirates IBAN with the full ISO 7064 MOD-97-10 checksum.
India Phone Number Validator
Validate any Indian mobile or landline against the TRAI numbering plan — operator, circle, and E.164 format included.
Spain IBAN Validator
Validate a Spanish IBAN — MOD-97 checksum + both internal CCC check digits explained.
Turkey TC Kimlik No Validator
Verify the two check digits of a Turkish national ID number instantly.
Turkey IBAN Validator
Validate a Turkish IBAN — MOD-97 checksum, bank code lookup and full BBAN breakdown.
Finnish IBAN Validator
Instantly verify any Finnish bank account number in IBAN format — ISO 7064 checksum, bank code and issuing bank included.
China Resident ID Validator
Verify an 18-character Chinese Resident Identity Card number and decode its embedded data.
Meta Description Length Checker
Instantly see if your meta description is the right length for Google.
Title Tag Length Checker
Check whether your HTML title tag fits Google's SERP display limit.
SEO & Web
More Developer Tools
Merge PDF
Combine multiple PDFs into one, drag to reorder, download — nothing uploaded.
Cron Expression Explainer
Translate any cron expression into plain English — and build your own.
TCF Consent String Encoder (IAB v2.x)
Build and encode a valid IAB TCF v2 consent string from selected purposes and vendors
Cookie Inspector & SameSite Auditor
List this page's cookies and audit a pasted Set-Cookie header for security flags
DKIM Record Builder
Assemble a DKIM TXT record from key, version, and service type fields
DMARC Record Builder & Policy Explainer
Build a DMARC TXT record and get a plain-English explanation of each tag
Email Header Analyzer
Paste raw email headers and get SPF, DKIM, DMARC results and routing hops
IPv4/IPv6 CIDR Range Calculator
Enter a CIDR and get network address, broadcast, host range, and usable IPs
localStorage / sessionStorage Inspector
View, search, and flag tracker-pattern keys in your browser web storage
NATO Phonetic Alphabet Converter
Spell any word or code in the NATO phonetic alphabet.
TCF Consent String (IAB) Decoder
Decode any IAB TCF v2.x base64 consent string into human-readable purpose consents
Android APK Inspector
Inspect an APK's manifest, permissions and version code in your browser
BPM Detector
Detect beats-per-minute of an audio file using Web Audio API analysis
Audio Sample Rate Converter
Resample audio to 44100 / 48000 / 22050 Hz in your browser
Audio Waveform Viewer
Visualise a WAV or MP3 waveform locally — no upload, no flash
BiDi / RTL Text Inspector
Reveal hidden Unicode BiDi control characters in text or filenames.
Binary File Inspector
Inspect any binary: extracted strings, byte histogram and entropy heatmap.
BMP / ICO File Inspector
Inspect BMP DIB header and ICO directory — size, bit depth, color planes
Browser Fingerprint Preview
See what fingerprinting signals your browser exposes — without sending any data anywhere
CAA DNS Record Builder
Build a Certification Authority Authorisation DNS record to control who can issue your TLS certs
TLS Certificate Decoder (PEM)
Paste a PEM certificate and see subject, SANs, validity, and signature algorithm
Content Negotiation & Accept Header Builder
Build a valid Accept header with quality factors and explain each q-value
Content Security Policy (CSP) Header Builder
Build a valid CSP header from a guided directive UI with inline explanations
Data URI to File Converter
Decode a base64 data URI and download the binary file
DNS Zone File Parser
Parse BIND-format DNS zone files and display records as a structured table.
Dockerfile Linter
Lint a Dockerfile for best-practice violations and security issues
DOCX Metadata Viewer
Read a Word document's author, dates and revision count without opening Word.
EBML / Matroska Inspector
Inspect MKV / WebM container structure and track metadata locally
Browser Entropy Source Tester
Verify that crypto.getRandomValues works in the current browser environment
EPUB Metadata Viewer
Read title, author, ISBN, and cover from an EPUB file locally.
Excel Formula Parser & Explainer
Paste an Excel formula and get a tree breakdown of what it does
Fixed-Width File Parser
Define column widths and parse fixed-width text files to CSV or JSON
FLAC Metadata Viewer
Read FLAC STREAMINFO and Vorbis comment tags locally
Font Metadata Viewer
Read name-table entries — family, version, copyright, licence — from a font file.
Local Font Previewer
Preview a TTF, OTF, or WOFF2 font file locally before installing it.
GPX Elevation & Distance Stats
Ascent, descent, distance, and pace from any GPX file
GPX Activity Heatmap
Overlay multiple GPX tracks as a heat map — local, no Strava required
GPX Lap Timer
Define a start/finish line in your GPX and auto-detect lap times
GPX Merger
Combine multiple GPX files into one track file in seconds
GPX Route Reverser
Reverse any GPX route or track and download the mirrored file
GPX Splitter
Split a GPX file by point count, time gap, or date boundary
GPX to FIT Converter (Garmin)
Convert a GPX track to a Garmin .fit activity file — entirely in your browser.
GPX to KML Converter
Convert GPX tracks and waypoints to Google Earth KML — fully private
GPX Track Simplifier
Reduce GPX track-point count with Ramer-Douglas-Peucker — keep shape, lose bloat
GPX Viewer
Visualise GPX tracks and waypoints — no account, no upload
HAR File Viewer
Browse HTTP Archive .har files and analyze request/response timings.
Homoglyph / Lookalike Character Detector
Find visually similar Unicode characters that could be used for phishing.
.htaccess to Nginx Rewrite Converter
Convert Apache .htaccess RewriteRule directives to Nginx config
HTML to PDF Converter (Local Print)
Save any pasted HTML as a PDF using the browser's print-to-PDF engine.
HTTP Response Header Analyzer
Paste raw HTTP headers and get a security and caching score with fixes.
HTTP Security Headers Grader
Paste response headers and get an A-F security grade with remediation advice.
ID3 Tag Viewer & Editor
Read and edit MP3 ID3v2 tags — title, artist, album, artwork — locally
JMESPath Tester
Test JMESPath expressions for AWS CLI and JSON querying in real time
KML to GPX Converter
Convert Google Earth KML to GPX for Garmin, Strava and mapping apps
M3U8 / HLS Playlist Parser
Parse and inspect HLS .m3u8 playlist files — segment list, bandwidths, keys
Magic Number / File Type Detector
Identify a file's true type from its magic bytes, not just its extension.
MessagePack Viewer
Decode MessagePack binary data to readable JSON right in your browser.
MP3 / Audio Silence Detector
Find silent segments in an audio file using the Web Audio API
OAuth 2.0 Scope Explainer & Risk Scorer
Paste an OAuth scope string and get a plain-English explanation and privacy risk score.
OGG / Vorbis Metadata Viewer
Read Vorbis comment tags from OGG audio files in your browser
OpenAPI Spec to Markdown Docs
Generate a Markdown API reference from an OpenAPI YAML or JSON spec.
Patch Applier
Apply a unified-diff .patch to your source text right in the browser.
PDF Form Field Inspector
List every AcroForm field, type, and value in a PDF — locally.
PDF Image Extractor
Extract all embedded images from a PDF as PNG files — no upload.
PDF Metadata Remover
Strip author, creator, and creation-date metadata from PDF files locally
PDF Page Reorder (Drag & Drop)
Drag PDF page thumbnails to reorder them, then download the result
PDF Page Rotator (Local)
Rotate individual or all pages in a PDF by 90° / 180° — no upload
PDF Text Redactor
Find and remove sensitive text from a PDF, entirely in your browser.
PDF to Plain Text Extractor
Extract readable text from a PDF file — private, no upload required
PDF Word Count
Count words, characters, sentences and pages in a PDF — locally in your browser.
PGP / OpenPGP Key Inspector
Inspect a PGP public key — User IDs, fingerprint, algorithm, subkeys.
macOS / iOS Plist Viewer
View binary or XML plist files from macOS or iOS apps in your browser
Google Polyline Encoder / Decoder
Encode lat/lon pairs to Google Encoded Polyline strings, and back
Postman Collection to OpenAPI Converter
Convert a Postman Collection v2.1 JSON to an OpenAPI 3.0 YAML spec
PEM / Private Key Inspector
Inspect a PEM certificate or key — type, algorithm, key size, and expiry.
QR Code Decoder
Decode a QR code image locally — no upload, no third-party API.
TAR / TAR.GZ Inspector
Browse tar and gzipped-tar archive contents without extraction tools.
Unix Timestamp Converter
Convert Unix timestamps to human-readable dates in any timezone.
TLS Certificate Decoder
Paste a PEM certificate and decode every X.509 field in your browser.
TLS Cipher Suite Decoder
Paste a cipher suite name or IANA code and get security rating and deprecation status
TTF to WOFF2 Converter
Compress a TTF or OTF font for the web — smaller files, no upload.
TypeScript Playground (Offline)
Compile TypeScript to JavaScript in your browser — no server, no tsc install
Unicode Character Inspector
Inspect every Unicode code point in a string — name, block, category.
vCard to LDIF Converter
Convert VCF contacts to LDIF format for LDAP and Active Directory import
Video File Metadata Viewer
Read codec, resolution, duration, and frame rate from video files locally
Video Thumbnail Extractor
Extract frames from a video file at configurable timestamps — no upload
WAV Header Inspector
Parse WAV/RIFF header to show sample rate, channels, bit depth, and duration
Webpack / Rollup Bundle Stats Visualizer
Visualize a webpack stats.json or rollup bundle as a treemap
WOFF2 to TTF Converter
Decompress a WOFF2 web font back to a usable TrueType/OpenType file.
ZIP File Inspector
Browse a ZIP archive's contents and metadata without extracting it.
G-Code Arc (I/J/K) Calculator
Generate G02/G03 I/J center-offset values from start, end, and radius
G-Code Drilling Cycle Calculator
Build G81/G83 canned-cycle blocks for any hole pattern depth and peck size
A1 ↔ R1C1 Notation Converter
Switch spreadsheet cell references between A1 and R1C1 style
Accent Fold (Search Normaliser)
Fold accented letters to ASCII base for search matching
Adler-32 Checksum Calculator
Fast Adler-32 checksum as used in zlib, PNG, and the deflate format
Arbitrary Base Converter
Convert any integer between bases 2 through 36 instantly
ASCII / Unicode Code to Character
Convert a decimal or hex code point to its character
B-Encoding (RFC 2047) Encoder
MIME header word encoding: =?UTF-8?B?...?= Base64 variant
Base-N Arithmetic Calculator
Add, subtract, multiply in any base from 2 to 36
Base122 Encoder/Decoder
Experimental ultra-dense 7-bit encoding for HTML and JS embedding
Base36 Encoder and Decoder
Encode integers to compact alphanumeric base-36 and decode them back
Base45 Encoder/Decoder
Compact QR-code-friendly encoding used in EU COVID passes
Base62 Encoder/Decoder
URL-safe alphanumeric encoding — 0-9, A-Z, a-z only
Base91 Encoder/Decoder
High-density printable encoding — denser than Base64
Base91 Encoder/Decoder
Encode binary data with the efficient Base91 alphabet
Baudot / ITA2 Encoder
Encode text to 5-bit Baudot teleprinter codes
Baudot / ITA-2 Encoder
Encode ASCII text to Baudot/ITA-2 5-bit teleprinter code
BCD (Binary-Coded Decimal) Converter
Encode decimal digits as 4-bit BCD nibbles
Excess-3 BCD Converter
Encode decimal digits in Excess-3 (Stibitz code) BCD format
bcrypt Cost Factor Estimator
Estimate bcrypt hashing time for each cost factor 4–18
Bech32 Encoder/Decoder
SegWit Bitcoin address and Lightning invoice encoding with BCH checksum
Bencode Encoder/Decoder
BitTorrent's bencode: strings, integers, lists, dicts
Big5 Encoder/Decoder
Traditional Chinese Big5 byte encoding and decoding
Binary Text Converter
Convert text to and from 8-bit binary 01010100 01100101…
Bit Parity Calculator
Determine even/odd parity of any integer's bit string
Bit Population Count (popcount)
Count the number of set (1) bits in any integer
Bit Shift Calculator
Left-shift and right-shift integers, with logical and arithmetic modes.
Bitwise Calculator
Compute AND, OR, XOR and NOT on integers in decimal, hex or binary.
BOM Add / Remove Tool
Insert or strip the UTF-8 BOM (EF BB BF) from text
camelCase Converter
Convert space, snake, or kebab text to camelCase identifier format
Caverphone Encoder
New Zealand phonetic encoding — better for NZ/Aus names
Character Frequency Map
Count every character and show descending frequency table
Character to ASCII / Unicode Code Converter
Get the decimal, hex, and octal codes for any character
Adler-32 Checksum Calculator
Compute the fast Adler-32 rolling checksum
Fletcher-16 Checksum Calculator
Compute the Fletcher-16 error-detection checksum
Fletcher-32 Checksum Calculator
Compute the Fletcher-32 error-detection checksum
Chord Keyboard Encoder
Map letters to stenography-style chord key combinations
Unicode Code Points to UTF-8
Compose Unicode code point sequences back into readable text
Cologne Phonetics (Kölner Phonetik)
German-optimised phonetic encoding for name matching
Cron Expression to Human Text
Translate a cron schedule expression into plain English
Data URI Encoder
Encode text or binary to a data: URI for inline embedding
Decimal Degrees ↔ Degrees Decimal Minutes
Convert between DD and DDM coordinate formats
Decimal Char Code Converter
Convert text to space-separated decimal char code points
DMS to Decimal Lat/Lng Converter
Convert degrees, minutes, seconds coordinates to decimal form
.NET DateTime Ticks Converter
Convert .NET DateTime ticks of 100-ns intervals to calendar dates
Double Metaphone Encoder
Primary and alternate phonetic codes for ambiguous pronunciations
DST Transition Date Finder
Find daylight saving start/end dates for any timezone and year
EBCDIC ↔ ASCII Converter
Convert between IBM EBCDIC and ASCII character encodings
EBCDIC Encoder/Decoder
Convert ASCII text to IBM EBCDIC code points and back
ECEF to Lat/Lng Converter
Convert Earth-Centered Earth-Fixed XYZ to lat/long/altitude
Endianness Swapper
Reverse byte order to convert between big-endian and little-endian hex.
Epoch Unit Converter
Convert epoch timestamps between seconds, ms, µs, and ns
Excel Column ↔ Number Converter
Convert Excel column letters (A, AB, ZZZ) to column numbers
Excel Serial Date Converter
Convert Excel and Lotus serial date numbers to calendar dates
Fixed-Point Converter
Convert real numbers to signed Qm.n fixed-point binary representation.
Fletcher-16 Checksum Calculator
Compute the Fletcher-16 two-byte checksum for data integrity
GB2312 / GBK Encoder/Decoder
Simplified Chinese GBK byte encoding and decoding
Geo URI Encoder
Format lat/lon/altitude as RFC 5870 geo: URI
Gray Code Converter
Convert binary integers to/from reflected Gray code
Gray Code Converter
Convert integers to Gray code and back — single-bit transitions
Hamming Distance Calculator
Count differing bit positions between two binary integers
Hamming(7,4) Encoder/Decoder
Add error-detecting parity bits using Hamming code
Homoglyph Detector
Highlight Unicode chars that look like ASCII but aren't
HTML Form URL Encoding
Encode form data using application/x-www-form-urlencoded rules
Hue Rotation Calculator
Rotate a color's hue by any degree offset around the color wheel
Human Text to Cron Expression
Convert plain-English schedules into valid cron syntax
bfloat16 Inspector
Inspect Google Brain's 16-bit bfloat16 floating-point format
IEEE-754 Float32 Inspector
Dissect 32-bit floating-point sign, exponent, and mantissa bits
IEEE-754 Float64 Inspector
Dissect the sign, exponent and mantissa bit fields of any 64-bit double.
IEEE-754 Float16 (Half) Inspector
Inspect 16-bit half-precision floating-point bit fields
Invisible Character Stripper
Remove zero-width spaces, soft hyphens, BOM, and other invisible chars
IPv4 Address ↔ Decimal Converter
Convert IPv4 dotted-quad notation to/from 32-bit decimal
IPv6 Address Expander/Compressor
Expand :: compressed IPv6 to full form and compress it back
IRI Encoder (RFC 3987)
Percent-encode an IRI to URI, preserving Unicode path chars
ISO 3166 Country Code Converter
Convert between ISO 3166-1 alpha-2, alpha-3, and numeric country codes.
ISO-8601 Date-Time Builder
Construct a valid ISO-8601 date-time string from parts
ISO-8601 Duration Converter
Parse and convert ISO-8601 duration strings like P1Y2M3DT4H
ISO-8601 Date-Time Parser
Break down an ISO-8601 string into its component fields
kebab-case Converter
Convert text to lowercase-kebab-case for CSS and URLs
KOI8-R Encoder/Decoder
Russian Cyrillic KOI8-R byte encoding to hex and back
Lat/Lng to DMS Converter
Convert decimal latitude/longitude to degrees, minutes and seconds
Lat/Lng to ECEF Converter
Convert WGS-84 lat/long/altitude to ECEF Cartesian XYZ
Lat/Lng to Maidenhead Locator
Convert coordinates to a Maidenhead ham-radio grid square
Lat/Lng to MGRS Converter
Convert coordinates to a Military Grid Reference System string
Lat/Lng to Plus Code Converter
Encode coordinates as an Open Location Code (Plus Code)
Leading Zeros Counter (CLZ)
Count leading zero bits in an integer (CLZ operation)
LEB128 Encoder/Decoder
Encode integers to WASM-style Little Endian Base 128 format
Line Ending Converter (CRLF / LF)
Switch between Windows CRLF, Unix LF, and classic Mac CR
Relative Luminance Calculator
Compute WCAG relative luminance for any RGB or hex color
Mac Absolute Time Converter
Convert Apple CFAbsoluteTime in seconds since 2001-01-01 to dates
Maidenhead Locator to Lat/Lng
Convert Maidenhead grid square references to lat/long coordinates
Mailto URI Encoder
Build a mailto: URI with to/cc/bcc/subject/body encoded
Metaphone Encoder
More accurate phonetic encoding than Soundex for English words
MGRS to Lat/Lng Converter
Convert MGRS grid references back to decimal lat/long
Morse Code Encoder/Decoder
Convert text to and from International Morse Code dots and dashes
NATO Phonetic Alphabet Converter
Spell out any text using the NATO phonetic alphabet
Netstring Encoder/Decoder
Encode strings in Bernstein's length:data, netstring format
Multi-Base Number Display
See any integer simultaneously in binary, octal, decimal, and hex
NYSIIS Encoder
New York State Identification and Intelligence System phonetic code
Octal Text Converter
Convert text to octal byte values — like \033 in shell scripts
Octal to Binary Converter
Translate base-8 octal numbers into binary bit strings
Octal to Decimal Converter
Convert base-8 octal numbers to base-10 decimal
One's Complement Converter
Flip every bit to compute the one's-complement binary of an integer.
Ordinal Date Converter
Convert between calendar dates and ISO ordinal dates (YYYY-DDD)
PascalCase Converter
Convert text to PascalCase — every word capitalised, no separators
URL Percent-Decoder
Decode percent-encoded URL characters back to plain readable text
URL Percent-Encoder
Percent-encode special characters in a URL or URI component
Percent / URL Encoding
Encode arbitrary bytes as %XX sequences for URLs
Plus Code to Lat/Lng Converter
Decode a Plus Code back to decimal lat/long coordinates
Google Polyline Decoder
Decode a Google encoded polyline string into lat/long points
Google Polyline Encoder
Encode a list of lat/long points as a Google encoded polyline
Q-Encoding (RFC 2047) Encoder
MIME header word encoding: =?UTF-8?Q?...?= for non-ASCII
RFC-2822 Date Converter
Convert between RFC-2822 email date format and ISO dates
RFC-3339 Date Converter
Convert between RFC-3339 timestamp strings and other formats
ROT-13 Encoder/Decoder
Apply the ROT-13 Caesar cipher substitution to any text
Run-Length Encoding (RLE)
Compress repeated runs: AAABBC → 3A2B1C
SCREAMING_SNAKE_CASE Converter
Convert text to UPPER_SNAKE_CASE for constants and env vars
Sexagesimal (Base-60) Converter
Convert integers to and from base-60 Babylonian sexagesimal notation.
Shift-JIS Encoder/Decoder
Show Shift-JIS (CP932) byte sequences for Japanese text
Sign-Magnitude Converter
Encode signed integers as a sign bit plus a plain magnitude in binary.
Slugify
Convert any string to a URL-safe lowercase-hyphenated slug
snake_case Converter
Convert camel, space, or kebab text to lowercase_snake_case
Soundex Encoder
Encode names to their 4-char Soundex phonetic code
Tab ↔ Space Converter
Expand tabs to spaces or compress spaces to tabs at a chosen width
Tel URI Encoder
Format phone numbers as RFC 3966 tel: URI strings
Balanced Ternary Converter
Convert integers to and from balanced ternary using digits T (−1), 0 and 1.
Inline Text Diff Viewer
Compare two strings character-by-character with inline highlights
Multi-Timezone World Clock
Show the current time in multiple world timezones simultaneously
Timezone Abbreviation Decoder
Look up which timezones use an abbreviation like CST or IST
Timezone Offset Converter
Convert date-times between any two timezone offsets
Trailing Zeros Counter (CTZ)
Count trailing zero bits in an integer (CTZ operation)
Two's Complement Converter
Compute the two's-complement binary of a signed integer at any bit width.
Unicode Code Point Inspector
Show code point, category, block, and UTF-8 bytes per character
Unicode NFC Normaliser
Compose Unicode sequences to NFC canonical form
Unicode NFD Decomposer
Decompose precomposed Unicode characters to NFD base + marks
Unicode NFKC Normaliser
Compatibility + composition normalisation — collapses ligatures, widths
Unicode NFKD Decomposer
Compatibility + decomposition — exposes every combining element
Homoglyph Steganography Encoder
Hide bits by swapping Latin letters for Cyrillic lookalikes
Current Unix Timestamp
See the current Unix timestamp in seconds, ms, µs, and ns
Unix Timestamp (Microseconds) Converter
Convert Unix epoch microseconds to/from human-readable date-time
Unix Timestamp (Milliseconds) Converter
Convert Unix epoch milliseconds to/from human-readable date-time
Unix Timestamp (Nanoseconds) Converter
Convert Unix epoch nanoseconds to/from human-readable date-time
Unix Timestamp (Seconds) Converter
Convert Unix epoch seconds to/from human-readable date-time
UPC-E to UPC-A Expander
Expand a 6-digit UPC-E suppressed barcode to 12-digit UPC-A
UTF-16 to UTF-8 Converter
Transcode text or byte sequences from UTF-16 to UTF-8
UTF-8 Byte Counter
Count the exact number of UTF-8 bytes in any text string
UTF-8 to Unicode Code Points
Explode any UTF-8 text into its Unicode code point values
UUencode Encoder/Decoder
Encode and decode files with classic UNIX uuencode format
UUEncode / UUDecode
Classic Unix-to-Unix email attachment encoding, in your browser
Whitespace Normaliser
Collapse multiple spaces, trim, and fix invisible space characters
Whitespace Steganography Encoder
Hide a secret message in space/tab patterns in blank lines
Windows FILETIME Converter
Convert Windows FILETIME 64-bit values to readable dates
XXEncode / XXDecode
UUEncode variant using only alphanumerics, plus and minus
yEnc Encoder/Decoder
Usenet binary encoding roughly twice as efficient as UUEncode
Z85 Encoder/Decoder
ZeroMQ's printable Base85 variant safe in code strings
Zero-Width Character Steganography
Hide text in zero-width Unicode chars invisible in normal display
ZigZag Integer Encoder
Encode signed integers via protobuf ZigZag encoding
URL Decoder
Decode percent-encoded text and URLs back to readable form.
Case Converter
Convert text between camelCase, snake_case, PascalCase, kebab-case and more.
Unix Timestamp Converter
Convert Unix epoch timestamps to dates and back — UTC, local, ISO and relative.
IP Subnet / CIDR Calculator
Work out network, broadcast, host range and mask from any IPv4 CIDR.
Binary to Decimal Converter
Turn any binary number into its base-10 value instantly.
Decimal to Binary Converter
Convert any whole number to binary, grouped for readability.
Decimal to Octal Converter
Convert any whole number to octal (base 8) instantly.
Roman Numeral Converter
Convert numbers to Roman numerals and back, both directions.
User-Agent Parser
Break a browser User-Agent string into browser, engine, OS and device.
MAC Address Lookup
Decode a MAC address — vendor OUI, unicast/multicast and local/universal.
DNS Record Explainer
Understand DNS record types and parse any zone-file line.
Glob Pattern Tester
Test glob patterns against a list of paths in real time.
Timestamp to Relative Time Converter
Turn a Unix timestamp into "3 hours ago" or "in 2 days".
Milliseconds to Time Converter
Break milliseconds into days, hours, minutes, seconds.
Epoch Milliseconds Converter
Convert between epoch milliseconds and human dates.
Time Ago Calculator
How long ago was a date — in plain language.
HAR File Viewer
Inspect a .har network capture without uploading it.
PX to EM Converter
Convert pixels to em relative to a parent font size.
Golden Ratio Calculator
Split any length into golden-ratio segments using φ ≈ 1.618.
Open Graph Tag Preview
Preview your Open Graph link card and generate the meta tags.
IP to Binary Converter
Convert an IPv4 address to binary, hex and decimal.
CIDR to IP Range
Expand a CIDR block to its network, broadcast and host range.
Subnet Mask Converter
Convert between CIDR prefix and dotted-decimal subnet mask.
IPv6 Expander
Expand a compressed IPv6 address to its full 8-group form.
IP Class Finder
Find the class (A–E) and scope of any IPv4 address.
Rotate PDF Pages
Turn sideways or upside-down PDF pages the right way up, then export.
Base-N Number Converter
Convert a number between any bases from 2 to 36.
Two's Complement Calculator
Signed decimal to two's complement binary and hex.
Binary Arithmetic Calculator
Add, subtract, multiply, divide and bitwise on binary numbers.
PDF Watermark
Stamp a text or image watermark onto every page of a PDF — opacity, position and rotation, all in your browser.
Cron Expression Builder
Build, decode and preview cron schedules visually — see the next runs instantly.
Gantt Chart Maker
Plan a project timeline with tasks, dependencies and a critical path — then export a PNG.
Pivot Table Builder
Turn raw CSV into a summarised pivot table — drag fields, aggregate, export.
URL Parser
Break a URL into protocol, host, port, path, query and hash.
Slug From Title
Turn a headline into a short, clean URL slug.
Markdown to Jira
Convert Markdown into Jira wiki markup for tickets and comments.
Jira to Markdown
Convert Jira wiki markup back into clean Markdown.
PDF Text Extractor
Pull all the text out of a PDF and copy or download it as a .txt file.
Crontab Expression Builder
Build and read cron schedules field by field.
Kebab Case to Camel Case Converter
Turn 'kebab-case' identifiers into 'camelCase' instantly.
Snake Case to Camel Case Converter
Turn 'snake_case' identifiers into 'camelCase' instantly.
Camel Case to Snake Case Converter
Turn 'camelCase' identifiers into 'snake_case' instantly.
Constant Case Converter
Turn any text into 'CONSTANT_CASE' for env vars and constants.
Dot Case Converter
Turn any text into 'dot.case' for keys and namespaces.
Add Page Numbers to a PDF
Stamp Bates-style page numbers onto any PDF — position, format and font your way.
Chart Maker
Paste a table, pick bar, line or pie, then export a high-resolution PNG.
HTML Live Editor
Write HTML, CSS and JS and see the result render live.
cURL to Code Converter
Paste a curl command, get ready-to-run fetch, axios, Python or PHP code.
PDF Metadata Editor
View and edit a PDF's title, author, subject and keywords, then export.
Link-in-Bio Page Builder
Build a personal link-in-bio page and export it as one standalone HTML file.
PDF Form Filler
Load a fillable PDF, type into its fields, then flatten and download.
Data Anonymizer
Mask emails, names, phones and cards in CSV or JSON with realistic fakes.
Sign PDF Online
Draw or type a signature, place it on any page, and download a signed PDF.
Conventional Commit Builder
Build a spec-compliant Conventional Commits message and copy it in one click.
PDF N-up: Multiple Pages Per Sheet
Arrange 2, 4, 6, 8, 9 or 16 PDF pages on one sheet for printing.
PDF Cropper
Trim page margins and set a new crop box on every page — preview and download.
Delete Pages from a PDF
Remove unwanted pages from a PDF and download the trimmed file.
ZIP Archive Explorer
Open a .zip in your browser, browse its files, preview text and images, and extract any file.
PDF Booklet Imposition Tool
Reorder PDF pages into 2-up saddle-stitch booklet print order.
Crontab to Human
Paste a cron expression and get a plain-English schedule plus the next run times.
PDF Text Per Page
Extract the text from each PDF page into a labelled, copyable list.
Batch Timestamp Converter
Convert a whole list of Unix timestamps and dates at once — timezone-aware, copy and export.
Number Base Converter
Convert between binary, octal, decimal, hex and any base from 2 to 36.
Markdown to PDF Converter
Write Markdown, preview live, export a styled PDF — all in your browser.
XPath Tester & Evaluator
Run XPath 1.0 expressions against your XML and see every matching node — live, in your browser.
Chmod Calculator
Tick read, write and execute boxes — get the octal chmod command.
Subnet Calculator
IPv4 address + CIDR or mask → network, broadcast, host range and counts.
REM to PX Converter
Convert rem to pixels instantly — single values, batch lists, and full spacing-scale previews.
Line Height Calculator
Convert line-height across all CSS units, see leading, and check readability.
PX to REM Converter
Convert pixel values to rem — single, bulk, reference table, and reverse lookup.
Text & Writing Tools
Case & Formatting
SRT Subtitle Cleaner
Remove HTML tags, SDH annotations and ad lines from SRT subtitle files.
String Case Converter
Convert text between camelCase, snake_case, PascalCase, kebab-case
Subtitle FPS Converter
Reframe subtitle timing between frame rates like 23.976 and 25 fps.
Subtitle File Merger
Merge two subtitle tracks into one file, interleaved in timestamp order.
Subtitle File Splitter
Split one subtitle file into two parts at a chosen timecode, renumbered.
Subtitle Time Shifter / Resync
Shift subtitles by a fixed offset or stretch linearly between two anchor points.
Subtitle / Caption to Plain Text
Extract dialogue from SRT or VTT as a clean transcript you can copy or save.
aLtErNaTe CaSe Converter
Alternate upper and lower case letter by letter
Blog Post Title Generator
Clickworthy blog titles from any topic
Columnar Transposition Cipher
Rearrange columns of text using a keyword permutation.
Academic Paper Title Generator
Dry but authoritative research paper titles
Album Title Generator
Evocative album names for any musical genre
Book Title Generator
Compelling book titles that readers click
Case Study Headline Generator
Results-focused case study titles for sales tools
rAnDoM CaSe Converter
rAnDoMlY uPpEr AnD lOwEr CaSe EaCh ChArAcTeR
Film Title Generator
Evocative movie titles by genre
Video Game Title Generator
Evocative game titles for any genre
Grant Proposal Title Generator
Fundable-sounding research grant titles
Fictional National Anthem Title Generator
Anthem titles for fictional countries and factions
Song Title Generator
Memorable song titles for any genre and mood
Thesis & Dissertation Title Generator
Colon-heavy academic thesis title formats
Sentence Case Converter
Capitalise only the first word of each sentence
Title Case Converter
Capitalise every major word per AP, Chicago, or all-caps style rules
Toggle Upper/Lowercase
Swap the case of every letter — upper becomes lower, lower upper
Title Case Converter
Convert text to proper title case with smart minor-word handling.
Capitalize Each Word
Capitalize the first letter of every word in your text.
Text Column Formatter
Align delimited rows into clean monospace columns.
CSV Column Extractor
Pull selected columns out of any CSV instantly.
Bulk Text to Slug Converter
Turn many titles into URL slugs at once.
Word Wrap Tool
Wrap text to a fixed character width on word boundaries.
Text Case Converter
Convert text between camelCase, snake_case, kebab-case, Title Case and more — live.
Subtitle Converter (SRT, VTT, SBV)
Convert between SRT, WebVTT and SBV, shift timing and fix sync — in your browser.
Fancy Fonts & Social
Bold Italic Unicode Text
Make heavy slanted text using the Unicode Bold Italic math block.
Bold Serif Unicode Text
Turn text into bold serif Unicode math block characters
Bold Unicode Text Generator
Bold text using Unicode math characters
Braille Grade 2 Contracted Encoder
Encode English text using Grade 2 contracted Braille contractions
Bubble Text Converter
Wrap each letter and digit in a circle — Ⓑⓤⓑⓑⓛⓔ outline or 🅑🅤🅑🅑🅛🅔 filled.
Double-Struck (Blackboard Bold) Text
Convert text to blackboard-bold double-struck letters like ℝ ℕ ℤ ℚ.
Italic Serif Unicode Text
Turn plain text into elegant italic serif letters from the Unicode math block.
Italic Unicode Text Generator
Italic text without markdown support
Mirror / Reverse Text
Reverse a string character by character, or mirror it with flipped Unicode glyphs.
Monospace Unicode Text
Turn text into fixed-width typewriter letters from the Unicode math block.
Upside Down Text Generator
Flip text upside down using Unicode characters
Vaporwave Username Generator
Full-width aesthetic names for vaporwave vibes
Sans-Serif Unicode Text
Convert text to clean sans-serif letters from the Unicode math block.
Cursive/Script Unicode Text
Turn text into flowing cursive script letters from the Unicode math block.
Strikethrough Text Generator
Apply a Unicode combining strikethrough, slash, or underline to every character — copy-paste ready.
Subscript Text Converter
Drop text into ₛᵤᵦₛ꜀ᵣᵢₚₜ using Unicode subscript characters
Superscript Text Converter
Lift text into ˢᵘᵖᵉʳˢᶜʳⁱᵖᵗ using Unicode superscript characters
Zalgo Text Generator
Add creepy combining diacritics to corrupt and glitch your text
Upside Down Text Generator
Flip text upside down with Unicode look-alikes.
Zalgo Text Generator
Create glitchy, corrupted Zalgo text you can copy anywhere.
Fancy Unicode Text Generator
Bold, italic, script and more — copy-paste fancy fonts.
Leetspeak Converter
Turn text into 1337 5p34k and back, in your browser.
Unicode Character Inspector
See the code point, hex, and category of every character.
Cursive Text Generator
Turn plain text into Unicode cursive and script styles, then copy.
Italic Text Generator
Turn plain text into italic and bold-italic Unicode you can paste anywhere.
Small Caps Generator
Convert text to Unicode small caps you can paste anywhere.
Upside Down Text Generator
Flip your text 180 degrees with Unicode — copy it anywhere.
Bold Text Generator
Turn plain text into Unicode bold you can paste anywhere.
Bubble Text Generator
Turn any text into circled bubble letters — filled and outline — and copy in one tap.
Fancy Text Generator
Turn plain text into 20+ Unicode font styles and copy each one.
Mirror Text Generator
Flip text backwards and into mirror-image glyphs you can copy and paste.
Superscript & Subscript Generator
Turn any text into Unicode superscript or subscript you can copy and paste anywhere.
Unicode Character Explorer
Paste text and inspect every code point — name, category, hex, HTML entity and UTF-8 bytes.
Wide Text Generator (Vaporwave Fullwidth)
Turn normal text into wide aesthetic fullwidth Unicode and back.
Strikethrough Text Generator
Cross out text with line, slash or wavy strikethrough — copy instantly.
Counters & Analysis
Word & Character Counter
Instant word, character, sentence and reading-time counts as you type.
Caption & Transcript Word-Count & Reading-Time
Paste an SRT, VTT, or plain transcript for word count, reading time, and caption density.
Reading Time & Complexity Analyser
Get estimated reading time, sentence count and per-paragraph complexity for any copy
Text Word Frequency Analyzer
Count word frequencies in any text and view them as a cloud or table
Word Frequency to CSV Exporter
Count word frequencies in a text file and export a ranked CSV table
Country Code to Flag Emoji
Convert ISO 3166-1 country codes to 🇬🇧 🇺🇸 flag emojis
Random Country Generator
Discover a random country with key facts
Fictional Country Name Generator
Names for invented nations and territories
Word Frequency Map
Count word occurrences and output sorted frequency table
Count Occurrences
Count how many times a word or pattern appears.
Reading Time Estimator
How long any text takes to read silently and to read aloud.
Line Counter
Count total, non-empty, blank and unique lines.
Text Frequency Analyzer
Count how often each word or character appears.
Syllable Counter
Count syllables in words and text with a per-word breakdown.
Sentence Counter
Count sentences, words and average sentence length instantly.
Social Media Character Counter
Live character count against every social platform limit.
Paragraph Counter
Count paragraphs, sentences and words with averages.
Readability Scorer
Paste text to get Flesch Reading Ease, Flesch-Kincaid grade and full stats.
Word Frequency Counter
Paste text and get a ranked word and phrase frequency table you can export.
Reading Time & Word Counter (Pro)
Live word, character, sentence and paragraph counts with adjustable reading and speaking time.
Clean & Transform
URL & UTM Tracker Stripper
Remove UTM, fbclid, gclid and 40+ tracking parameters from any URL
BibTeX Cleaner & Validator
Fix encoding, remove duplicates, and validate BibTeX .bib files
DOCX Text Extractor
Extract plain text from Word .docx files without Word or Google Docs
EPUB to Plain Text Extractor
Extract readable text from an EPUB ebook without an ebook reader app.
Consonant Remover
Reoe ao oo oa eei
Diacritic Stripper
Remove all accent marks: café becomes cafe, naïve becomes naive
Duplicate Line Remover
Remove exact duplicate lines keeping first or last occurrence
Multi-line Text Sorter
Sort lines alphabetically, numerically, by length, or reverse
Reverse Alphabet Cipher
Z=A, Y=B, X=C — Atbash built explicitly from a reversed alphabet
Reverse Words Transformer
Reverse the order of words while preserving punctuation
Vowel Remover
Strp ll vwls frm txt lk ths
Each Word Reversed
Reverse each word individually — sentence structure stays intact
Reverse Text
Reverse characters, words or whole lines instantly.
Sort Lines
Sort lines alphabetically, numerically or by length.
Remove Duplicate Lines
Strip duplicate lines, keeping the first of each.
Find and Replace Text
Bulk find and replace, with optional regex.
Text Repeater
Repeat any text N times with a chosen separator.
Whitespace Cleaner
Trim, collapse and tidy messy whitespace.
Remove Line Breaks
Join hard-wrapped lines back into flowing text.
Extract Emails from Text
Pull every email address out of any text.
Extract URLs from Text
Pull every link out of any text.
Extract Numbers from Text
Pull every number out of any text.
Remove Accents & Diacritics
Strip accent marks to get plain ASCII-friendly text.
Remove Extra Spaces
Collapse repeated spaces and tidy punctuation spacing.
Smart Quotes Converter
Swap between curly typographic quotes and straight quotes.
Duplicate Word Finder
Find words that repeat in your text and how often.
Text Shuffler
Randomly shuffle lines, words or characters with an unbiased shuffle.
Strip HTML Tags
Remove all HTML tags and get clean plain text.
Line Sort & Dedupe Tool
Sort, deduplicate, reverse, shuffle, number and reformat lines of text.
Bulk Find and Replace
Apply many find/replace rules to text at once — literal or regex.
Ciphers & Encoders
ADFGVX Cipher
WWI German field cipher combining a Polybius substitution with a columnar transposition.
Affine Cipher Encrypt & Decrypt
Linear substitution cipher: E(x) = (ax + b) mod 26.
Arabic Morse Code Encoder
Encode Arabic letters to Arab ITU Morse sequences
ASCII Shift Cipher Encoder & Decoder
Shift every byte by N in the ASCII table (all 256 values)
Autokey Cipher Encoder & Decoder
Vigenère variant that appends the message to the key
Bacon's Cipher Encoder & Decoder
Steganographic 5-bit binary cipher using A/B substitution.
Beaufort Cipher Encoder & Decoder
Reciprocal variant of Vigenère — decrypt with the same key
Variant Beaufort Cipher
Beaufort variant where plaintext subtracts the key (plain minus key)
Bifid Cipher Encrypt & Decrypt
Combines a Polybius square with fractionation for diffusion.
Book Cipher
Encode each word as a line and word position reference into a shared text.
Braille Encoder/Decoder
Convert text to Unicode Braille cell characters and back
Chaocipher Simulator
Simulate Byrne's 1918 Chaocipher permutation algorithm
Dancing Men Cipher (Sherlock Holmes)
Conan Doyle's stick-figure cipher as Unicode approximation
Double ROT13 (ROT26)
Apply ROT13 twice — a no-op that demonstrates cipher identity
Four-Square Cipher Encrypt & Decrypt
Digraph cipher using four interlocking Polybius squares.
Greek Morse Code Encoder
Encode Greek letters to their ITU Morse sequences
Gronsfeld Cipher Encoder & Decoder
Vigenère variant with a numeric key (digits 0–9 only)
Hill Cipher
Polygraphic cipher that encrypts letter pairs with a 2×2 matrix multiplication mod 26.
Keyword Substitution Cipher
Build a 26-letter cipher alphabet from a keyword for substitution
Korean Morse Code Encoder
Encode Hangul jamo to Korean Morse dot-dash sequences
Morse Code Encoder/Decoder
Convert text to dots and dashes and back using International Morse
Morse Prosigns & Special Chars
Encode ITU prosigns (AR, SK, BT) and punctuation in Morse
NATO Alphabet Encoder (Word Input)
Encode whole sentences spelling each word in NATO phonetic
ITU-R Morse with Prosigns
Full ITU-R Morse including SOS, AR, SK prosigns and Q-codes
Number NATO Phonetic Speller
Spell phone numbers as Niner-Two-Tree for radio clarity
NATO Phonetic Alphabet Converter
Spell out words as Alpha Bravo Charlie Delta and back
Nihilist Cipher Encoder & Decoder
Russian nihilist's Polybius-based additive numerical cipher
Phonetic Alphabet Word Generator
Build a custom spelling alphabet for any word or theme.
Phonetic Spelling Generator
Respell words showing approximate English pronunciation
Pig Latin Transformer
Onvert-cay ext-tay oo-tay ig-Pay atin-Lay
Pigpen Cipher
Masonic geometric cipher — replace each letter with its grid-cell shape.
Playfair Cipher Encrypt & Decrypt
Digraph substitution using a 5×5 keyword-keyed square.
3D Polybius Cube Cipher
Extend Polybius to a 3×3×3 cube for 27-character sets
Polybius Square Cipher Encoder
Encode each letter as a row and column coordinate pair.
Porta Cipher
Giovanbattista della Porta's 6-alphabet reciprocal cipher
Caesar Cipher Text Generator
Encrypt any text with a classic Caesar cipher
Morse Code Generator
Convert any text to dots and dashes
NATO Phonetic Alphabet Converter
Spell anything using the NATO phonetic alphabet
Pig Latin Generator
Translate any English text into Pig Latin
Rosicrucian / Templar Cipher
Secret society pigpen variant with dot-position encoding
ROT-N Cipher (Custom Rotation)
Choose any rotation N from 1 to 25 to shift letters
ROT13 Encoder & Decoder
Self-inverse letter rotation by 13 — the classic spoiler tool
ROT47 Encoder & Decoder
Rotates all 94 printable ASCII characters by 47 positions
Running Key Cipher Encoder & Decoder
Use a long key text (book passage) for each letter's shift
Russian / Cyrillic Morse Encoder
Encode Cyrillic letters to Russian Morse code sequences
Scytale Cipher
Ancient Greek transposition cipher — wrap text around a rod of a chosen diameter.
Discord ROT13 Spoiler Helper
ROT13 your text and wrap it in Discord spoiler tags
Straddle Transposition Cipher
Write text into irregular grid then read columns in key order
Straddling Checkerboard Cipher
WWII spy cipher: fractionating substitution with short codes
Knights Templar Cipher (Maltese Cross)
Encode letters in the Templar cross cell-based cipher
Tengwar-Style Phonetic Mapper
Map English phonemes to Tolkien-inspired Tengwar using CSUR Unicode Private Use Area code points.
Braille Dot Bitmap Renderer
Render text as a grid of Unicode Braille dot characters
Morse Code Audio Player
Generate and play Morse code audio beeps in the browser
Trifid Cipher Encrypt & Decrypt
A 3D extension of Bifid using a 3×3×3 cube of 27 symbols.
VIC Cipher (Soviet Spy) Simulator
Cold War Soviet agent cipher — straddling checkerboard + transposition
Extended Vigenère (Full ASCII)
Vigenère over 95 printable ASCII chars instead of just 26 letters
Wabun Code (Japanese Morse) Encoder
Encode katakana to Japanese Wabun Morse code sequences
XOR Cipher
XOR each byte of text with a repeating key — the symmetric building block of crypto.
ROT13 Converter
Encode and decode ROT13 — the letter-rotating cipher.
Caesar Cipher
Encrypt and decrypt text with a shifting Caesar cipher.
Text to Binary Converter
Convert text into UTF-8 binary, 8 bits per byte.
Binary to Text Converter
Decode binary back into readable UTF-8 text.
Pig Latin Translator
Turn English into Pig Latin instantly, in your browser.
Binary to Emoji Converter
Encode text as playful emoji binary and decode it back.
Phonetic Spelling Generator
Spell names and codes out loud with NATO or police alphabets.
Vigenère Cipher Encoder & Decoder
Encrypt and decrypt text with a keyword-based Vigenère cipher.
Atbash Cipher Encoder & Decoder
Mirror the alphabet — A becomes Z, B becomes Y, all in your browser.
Rail Fence Cipher Encoder & Decoder
Zig-zag transposition cipher with a choice of rails.
Substitution Cipher Encoder & Decoder
Keyword-seeded monoalphabetic substitution, all in your browser.
A1Z26 Cipher Encoder & Decoder
Convert letters to their alphabet position — A=1, Z=26.
ROT13 Encoder & Decoder
Encode or decode ROT13, ROT13+ROT5 and ROT47 instantly — copy in one click.
Binary Text Translator
Convert text to binary and back — plus decimal and hex of every code point.
Caesar Cipher Tool
Encrypt, decrypt and crack Caesar ciphers with any shift.
NATO Phonetic Alphabet Translator
Spell anything out in Alfa, Bravo, Charlie — and decode it back.
Braille Translator
Convert text to Grade-1 Unicode braille and back, in your browser.
Morse Code Translator
Convert text to Morse and decode Morse back to text, with audio playback and a reference chart.
Generators
Cookie Policy Generator
Build a GDPR-compliant cookie policy document from a guided form
Fake Data & Test PII Generator
Generate realistic but entirely fictional names, addresses, and IDs for testing
Privacy Policy Generator
Produce a GDPR and CCPA baseline privacy policy from a guided form — no sign-up
Acronym Generator
Turn any phrase into a memorable acronym
Acrostic Name Poem Generator
Personalised name poems where each line starts with a letter of the name
Anagram Generator
Find hidden words within any phrase or name
ASCII Banner Generator
Render a single line of tall ASCII banner text
ASCII Art Text Generator
Big bold ASCII banners from any text
Baby Name Generator (African)
Meaningful African names from diverse traditions
Baby Name Generator (Arabic)
Beautiful Arabic names with meanings
Baby Name Generator (Celtic)
Ancient Celtic names with warrior heritage
Baby Name Generator (Chinese)
Chinese names with character meaning combinations
Baby Name Generator (English)
Classic and modern English baby names with meanings
Baby Name Generator (French)
Elegant French names with Gallic charm
Baby Name Generator (Greek)
Classical Greek names with mythological roots
Baby Name Generator (Hebrew)
Biblical and modern Hebrew names with meanings
Baby Name Generator (Indian)
Sanskrit and regional Indian names with meanings
Baby Name Generator (Irish)
Authentic Irish names steeped in Celtic heritage
Baby Name Generator (Italian)
Melodic Italian names full of romance
Baby Name Generator (Japanese)
Japanese names with kanji meaning notes
Baby Name Generator (Korean)
Korean names with hanja meanings
Baby Name Generator (Latin)
Timeless Latin names from the Roman tradition
Baby Name Generator (Russian)
Russian names with Slavic heritage and meaning
Baby Name Generator (Scandinavian)
Norse and Nordic names with ancient roots
Baby Name Generator (Spanish)
Spanish and Latin American names with meanings
Electronic Music Act Name Generator
Futuristic names for DJs and electronic acts
Indie Band Name Generator
Quirky, poetic indie band names that stand out
Classical Ensemble Name Generator
Elegant names for orchestras and chamber groups
Jazz Band Name Generator
Sophisticated jazz ensemble names
Metal Band Name Generator
Heavy, dark, and powerful metal band names
Band Name Generator
Memorable band names across every genre
Brand Name Generator
Craft unique brand names across styles and vibes
Business Name Generator
Generate catchy, brandable business names instantly
Cat Lorem Generator
Meow-filled placeholder text for feline fans
Anime Character Name Generator
Japanese-style anime character names
Cyberpunk Character Name Generator
Street-level handles for your cyberpunk crew
Fantasy Character Name Generator
Otherworldly names for elves, mages, and heroes
Historical Character Name Generator
Period-accurate names from ancient to modern eras
Hero Name Generator
Bold heroic names with legendary resonance
Noir Character Name Generator
Hard-boiled detective names from classic noir
Sci-Fi Character Name Generator
Futuristic names for aliens, androids, and pilots
Villain Name Generator
Sinister names that strike fear and fascination
Western Character Name Generator
Rugged frontier names for cowboys and outlaws
Ancient City Name Generator
Names for lost civilizations and ancient cities
Future City Name Generator
Megacity names for science fiction worlds
Underwater City Name Generator
Aquatic city names for ocean-world settings
City Name Generator
Believable city names for any world or genre
Corporate Lorem Generator
Synergistic placeholder text for enterprise mockups
Truth or Dare Generator
Fun truth questions and dare challenges
Random Decision Generator
Let fate choose when you can't decide
Domain Name Generator
Find available-style domain names for your project
Email Subject Line Generator
High-open-rate subject lines for email campaigns
Emoji Combo Generator
Build expressive emoji combinations for any mood in one tap.
Corporate Tagline Generator
Meaningless-but-polished corporate taglines
Fictional Government Department Generator
Bureaucratic agency names for dystopian fiction
Dungeon Name Generator
Ominous dungeon names for your D&D campaign
Magic Shop Name Generator
Mysterious names for fantasy potion and spell shops
Tavern Name Generator
Welcoming (and dubious) tavern names for RPGs
Fantasy Place Name Generator
Mythical lands, forests, and realms named
Full-Width Text Generator
Aesthetic full-width Unicode text
Random Haiku Generator
Traditional 5-7-5 haiku on nature and the seasons
Hashtag Generator
Turn any topic into a batch of ready-to-post hashtag ideas.
Hipster Lorem Generator
Artisanal placeholder text for the discerning mockup
Initialism / Acronym Generator
Extract first letters of each word to form an acronym
Random Interview Question Generator
Behavioral and technical interview questions
Random Limerick Generator
Silly AABBA limericks built with real rhyme groups
Meeting Agenda Generator
Structured agenda templates for any meeting type
Meme Text Generator
Impact-font meme captions for any image
Memorable Password Generator
Strong passwords you can actually remember
Celtic Mythology Name Generator
Names from Irish and Welsh mythological cycles
Egyptian Mythology Name Generator
Names from the ancient Egyptian pantheon
Greek Mythology Name Generator
Names from the Greek pantheon and legend
Mesopotamian Mythology Name Generator
Ancient Sumerian and Babylonian mythological names
Norse Mythology Name Generator
Viking and Norse deity-inspired names
Name Mashup Generator
Creative portmanteau names from two inputs
NPC Name Generator (Demon)
Infernal names for demons and dark entities
NPC Name Generator (Elf)
Melodic elven names for your fantasy NPCs
NPC Name Generator (Fairy/Fae)
Whimsical fae names from the Unseelie Court
NPC Name Generator (Dwarf)
Rugged dwarven names carved from stone and steel
NPC Name Generator (Golem/Construct)
Designation-style names for constructs and golems
NPC Name Generator (Orc)
Brutal orcish names full of primal power
NPC Name Generator (Halfling)
Cozy, homely halfling names
NPC Name Generator (Space Alien)
Unpronounceable alien names from distant galaxies
NPC Name Generator (Undead)
Haunting names for liches, vampires, and wraiths
NPC Name Generator (Pirate)
Swashbuckling pirate names and epithets
NPC Name Generator (Vampire)
Aristocratic and ancient vampire names
NPC Name Generator (Wizard)
Arcane names for sorcerers, mages, and witches
Number-to-Name Generator
Turn any number into a stable, memorable word-based name.
Bird Name Generator
Charming names for parrots, finches, and all birds
Cat Name Generator
Purrfect names for your feline companion
Dog Name Generator
Fun and fitting names for your new dog
Fish Name Generator
Clever aquatic names for your underwater pets
Hamster Name Generator
Cute names for your tiny hamster companion
Horse Name Generator
Regal names worthy of a thoroughbred
Rabbit Name Generator
Adorable names for your fluffy bunny
Reptile Name Generator
Cool names for lizards, geckos, and snakes
Pirate Lorem Generator
Arrr! Swashbuckling placeholder text ahoy
Arabic Placeholder Text Generator
RTL Arabic dummy text for layout testing
French Placeholder Text Generator
Dummy copy in French for localization mockups
Japanese Placeholder Text Generator
Japanese dummy text for CJK layout testing
Product Description Seed Generator
Starter product descriptions for any item type
Beauty Product Name Generator
Luxurious names for skincare and cosmetics
Food Product Name Generator
Appetizing names for food brands and products
Tech Product Name Generator
Sleek, modern names for software and hardware
Product Name Generator
Inventive product names that sell themselves
Project Codename Generator (Animals)
Animal-themed codenames for any project
Project Codename Generator (Gemstones)
Precious gemstone codenames for special releases
Project Codename Generator (Mountains)
Mountain-peak codenames for bold projects
Project Codename Generator (Planets)
Planetary codenames for engineering projects
Project Codename Generator
Memorable internal codenames for any project
Raffle Draw Generator
Fair random draws for giveaways and contests
404 Page Message Generator
Creative, on-brand 404 error page copy
A/B Test Hypothesis Generator
Testable hypotheses for conversion optimization
Aesthetic Username Generator
Soft, aesthetic usernames for social platforms
Daily Affirmation Generator
Positive first-person affirmations for confidence and growth
Agency Name Generator
Professional names for creative and digital agencies
Alien Species Name Generator
Names for extraterrestrial races in sci-fi worlds
Alliteration Generator
Tongue-tied alliterative phrases for any letter
App Name Generator
Short, memorable names for your next mobile app
Fantasy Armor Name Generator
Named armors and shields for legendary heroes
Magical Artifact Name Generator
Ancient relics and magical items for any adventure
Board Game Name Generator
Unique names for tabletop game designs
Brand Voice Descriptor Generator
Brand personality and tone descriptors for style guides
Bucket List Item Generator
Life experiences to add to your bucket list
Car Model Name Generator
Aspirational car model names for auto fiction
Card Game Name Generator
Snappy names for card game designs
Celestial Event Name Generator
Names for fictional astronomical events
30-Day Challenge Generator
Month-long personal challenge ideas for growth
Artisan Cheese Name Generator
Regional-style names for fictional artisan cheeses
Cocktail Name Generator
Creative names for your original cocktail creations
Fantasy Codex Entry Generator
Lore entries for your world-building encyclopedia
Coffee Blend Name Generator
Artisan names for specialty coffee roasts and blends
Collective Noun Generator
The right word for a group of any animal.
Coming Soon Page Copy Generator
Pre-launch page copy to build anticipation
Company Slogan Generator
Memorable brand slogans for any industry
Compliment Generator
Genuine, specific compliments for any occasion
Tech Conference Name Generator
Names for fictional or actual tech events
Absurd Conspiracy Theory Generator
Clearly fictional conspiracy theories for satire
Company Core Values Generator
Named and defined core values for any organization
Corporate Buzzword Sentence Generator
Synergistically leverage your paradigm shifts
Mega-Corporation Name Generator
Ominous conglomerate names for dystopian fiction
Cottagecore Username Generator
Cozy, nature-inspired names for aesthetic accounts
Coworking Space Name Generator
Community-feel names for flexible workspaces
Crypto Token Name Generator
Names for fictional or prototype cryptocurrency tokens
Fictional Currency Name Generator
Names for made-up coins and credits
Customer Journey Map Seed Generator
Journey stage seeds for UX mapping workshops
Cyberpunk Username Generator
Hacker aliases for your cyberpunk alter-ego
Dad Joke Generator
Peak-cringe puns from the dad joke vault
Dark Academia Username Generator
Scholarly, atmospheric names for dark academia accounts
Decision Tree Generator
Simple yes/no decision trees for any question
Detective Name Generator
Gritty detective names for crime fiction
Fictional Dinosaur Name Generator
Scientific-style names for invented dinosaur species
D&D Tavern Rumor Generator
Overheard gossip and rumors for your campaign
Dwarven Rune Name Generator
Runic-sounding names for dwarven inscriptions
Dystopian Law Generator
Oppressive laws for dystopian fiction worlds
Elvish Phrase Generator
Tolkien-inspired elvish-sounding phrases
Random Emoji Generator
Random emoji from every Unicode category
Emoji Username Generator
Fun usernames mixing words and emojis
Random Epitaph Generator
Fictional tombstone inscriptions for stories and props
Fictional Era Name Generator
Historical epoch names for world-building timelines
Escape Room Name Generator
Intriguing names for escape room adventures
Euphemism Generator
Polite alternatives for difficult topics
Excuse Generator
Creative excuses for any social situation
Scientific Expedition Name Generator
Operation names for exploration and discovery
Faction Name Generator
Political factions and organizations for fiction
FAQ Question Generator
Common FAQ questions for any product or service
Fortune Cookie Generator
Cryptic wisdom in bite-sized fortune cookie format
Guild Name Generator
Trade guild and adventurer guild names for RPGs
Hackathon Name Generator
Creative names for your next hackathon event
Random Headline Generator
Clickbait and serious headlines for UI mockups
Headline Pun Generator
Groan-worthy puns formatted as news headlines
Heist Name Generator
Operation names for your fictional criminal crew
Random Historical Event Generator
Explore a random moment in human history
Fictional Holiday Name Generator
Invented holidays for fictional cultures and calendars
Fake Horoscope Generator
Vague cosmic predictions for all 12 signs
Horror Setting Generator
Dread-filled locations for horror stories and games
Hospital & Clinic Name Generator
Professional healthcare facility names
Hot Sauce Name Generator
Fiery names for artisan hot sauce brands
Random Icebreaker Generator
Fun icebreaker questions for teams and events
Behavioral Interview Answer Generator
STAR-format answers for common interview questions
Journal Prompt Generator
Thoughtful prompts for daily journaling across many themes
Random Kaomoji Generator
Japanese text emoticons for any emotion
Fantasy Kingdom Name Generator
Regal names for fantasy realms and dominions
Random Language Generator
Explore a random human language and script
Fictional Language Name Generator
Names for invented languages and scripts
Law Firm Name Generator
Professional law firm names for legal demos
Leet Speak Generator
Transform text into hacker-style 1337 speak
Fictional Legend Generator
Ancient legends and myths for fantasy worlds
LinkedIn Post Seed Generator
Thought-leadership post seeds for LinkedIn
Magic 8-Ball Response Generator
Classic 20-answer magic 8-ball predictions
Magic System Name Generator
Names for fictional magic systems and schools
Meal Plan Generator
Weekly meal plans for nutrition app demos
Meditation Focus Prompt Generator
Guided focus points, breathing patterns, and short mantras
Restaurant Menu Item Name Generator
Creative dish names for restaurant menus
Mercenary Company Name Generator
Battle-hardened company names for hire
Metaphor Generator
Creative metaphors for writing and rhetoric
Micro-Interaction Concept Generator
Delightful micro-interaction ideas for UI polishing
Military Operation Name Generator
Codenames for fictional military operations
Mission Statement Generator
Purpose-driven mission statements for any org
Random Monster Generator
New creature stats and lore for your campaign
Motivational Quote Generator
Pull a fresh motivational quote to spark action, by theme.
Newsletter Name Generator
Punchy names for email newsletters and publications
Newspaper Name Generator
Traditional and modern newspaper masthead names
NFT Collection Name Generator
Names for digital art and NFT project collections
NGO & Nonprofit Name Generator
Mission-driven names for nonprofits and charities
NPC Trait Generator
Personality quirks for memorable NPCs
Gaussian Random Number Generator
Normally distributed random numbers for statistics
OKR Generator
Objective and Key Result sets for team planning
Onboarding Flow Concept Generator
Step-by-step onboarding sequence concepts
Onomatopoeia Generator
Words that sound like what they describe
Oxymoron Generator
Contradictory word pairs for rhetoric and writing.
Palindrome Generator
Random words and phrases that read the same backwards.
Perfume Name Generator
Evocative fragrance names for scent brands
Pickup Line Generator
Cheesy (and clever) conversation starters
Pirate Crew Name Generator
Fearsome pirate crew names and epithets
Planet Name Generator
Alien world names for science fiction settings
Podcast Name Generator
Distinctive podcast show names for any niche
Poetry Prompt Generator
Form and free-verse poetry prompts to break a blank page
Portmanteau Word Generator
Blend two words into a clever new portmanteau.
Potion Generator
Mysterious potions with effects for RPGs
Press Release Opening Generator
Standard press release lede formats for any news
Pricing Plan Name Generator
Tier names beyond Starter, Pro, and Enterprise
Fantasy Prophecy Generator
Cryptic prophecies for chosen-one narratives
D&D Quest Generator
Adventure hooks for any D&D session
Radio Station Call Sign Generator
FCC-style radio call signs and station names
Recipe Generator
Fictional recipes with ingredients and steps
Fictional Religion Name Generator
Names for invented faiths in fiction and games
Random Riddle Generator
Clever riddles from easy to fiendishly hard
Friendly Roast Generator
Playful roast lines for friends and events
Robot & AI Name Generator
Designations for robots, androids, and AI systems
RPG Campaign Name Generator
Epic campaign titles for your tabletop adventures
Sarcasm Text Generator
AlTeRnAtInG cApS sArCaSm TeXt GeNeRaToR
School & University Name Generator
Academic institution names for education demos
Random Scientific Fact Generator
Fascinating science facts across all disciplines
Fictional Scientist Name Generator
Names for professors, researchers, and inventors
Secret Society Name Generator
Mysterious order names for conspiracies and fiction
Security Question Generator
Traditional security questions for auth flows
Random Sentence Generator
Grammatically valid random sentences
Side Project Idea Generator
Weekend project ideas for developers and makers
Simile Generator
Vivid comparisons for expressive writing
Sneaker Colorway Name Generator
Creative sneaker colorway names like the pros use
Spaceship Class Name Generator
Military and civilian starship classification names
Space Shuttle Name Generator
Names for civilian and research spacecraft
Magic Spell Generator
Unique spells for your fantasy RPG
Sports Commentator Name Generator
Memorable names for sports broadcasting characters
Sprint Goal Generator
Focused sprint goals for agile planning
Spy Codename Generator
Operation codenames for espionage fiction
Star System Name Generator
Names for star systems in your sci-fi universe
Startup Accelerator Name Generator
Names for VC programs and incubators
Startup Pitch Sentence Generator
It's Uber for X meets Airbnb for Y
Stoic Philosophy Quote Generator
Draw timeless Stoic wisdom from Marcus Aurelius, Epictetus and Seneca.
Study Schedule Generator
Weekly study timetables for education apps
Superhero Team Name Generator
Unite! Names for superhero squads and alliances
Supernatural Ability Generator
Unique paranormal abilities for supernatural fiction
Random Superpower Generator
Creative superpowers for heroes, villains, and games
Fantasy Tavern Menu Generator
Unique food and drink menus for fantasy inns
Tea Blend Name Generator
Evocative names for artisan tea blends
Team Challenge Generator
Creative team-building challenge ideas
Fictional Tech Invention Generator
Sci-fi technology concepts for near-future worlds
Tech & Programming Quote Generator
Surface wit and wisdom from legendary software engineers.
Customer Testimonial Generator
Fake testimonials for mockups and concept demos
Random Tongue Twister Generator
Challenging tongue twisters for speech practice
Treasure Hoard Generator
Loot tables and treasure descriptions for RPGs
Random Trivia Question Generator
Pub quiz questions across all topics
TV Show Name Generator
Compelling series titles for any genre
Random Tweet Generator
Fake tweet-length social posts for mockups
User Persona Generator
UX user personas for product design research
Utopian Society Feature Generator
Ideal society elements for utopian fiction
UwU Text Generator
Transform any text into adorable UwU speak
Value Proposition Generator
Clear value props for landing pages and pitches
Villain Backstory Generator
Origin stories that make villains understandable
Vision Statement Generator
Aspirational vision statements for organizations
Absurd Warning Label Generator
Ridiculous fictional product warning labels
Fantasy Weapon Name Generator
Legendary weapon names worthy of epic tales
Wine Label Name Generator
Memorable names for fictional or boutique wines
Fake Ancient Wisdom Generator
Made-up proverbs that sound profoundly real
Random Word Generator
Random words by part of speech and difficulty
Workout Plan Generator
Weekly workout routines for fitness apps
World-Building Event Generator
History-shaping events for fictional world timelines
YouTube Channel Name Generator
Memorable channel names for content creators
Agile Retrospective Question Generator
Fresh retro prompts to improve your team
RPG Character Backstory Generator
Rich origin stories for tabletop characters
RPG Personality Traits Generator
Character traits, ideals, bonds, and flaws
Pirate Ship Name Generator
Fearsome names for scallywag sailing vessels
Spaceship Name Generator
Legendary names for starships and cruisers
Ship Name Generator
Names worthy of the open sea or the cosmos
Social Media Bio Generator
Punchy bios for Twitter, Instagram, and LinkedIn
EdTech Startup Name Generator
Inspiring names for education technology ventures
FinTech Startup Name Generator
Trust-building names for financial technology startups
HealthTech Startup Name Generator
Caring names for health and wellness startups
LegalTech Startup Name Generator
Professional names for legal technology startups
Startup Name Generator
Tech-forward names for ambitious startups
Startup Pitch Tagline Generator
Elevator-pitch taglines for any startup idea
Story Prompt Generator
Unique story seeds to spark your next narrative
Fantasy Street Name Generator
Evocative street names for fantasy map-making
Sci-Fi Street Name Generator
Corridor and avenue names for space stations
Street Name Generator
Realistic street names for maps and fiction
Pronounceable Password Generator
Secure passwords that are easier to type and say
Strong Password Generator
Policy-compliant passwords for any requirements
Corporate Team Name Generator
Engaging team names for workplace groups
Sports Team Name Generator
Fierce mascot-based names for athletic teams
Esports Team Name Generator
Competitive team names for esports organizations
Team Name Generator
Strong team names for sports, esports, and work
Tech Lorem Generator
Developer-flavoured filler text for UI prototypes
This or That Generator
Quick preference polls for any topic
Random Tier List Generator
Randomly sort items into S through F tiers
CTA Copy Generator
Action-oriented button and CTA text variations
Empty State Copy Generator
Friendly empty state messages for app UIs
Error State Copy Generator
Clear, helpful error messages for user interfaces
Notification Copy Generator
Clear push notification copy that drives opens
Onboarding Copy Generator
Welcoming onboarding messages for app first runs
Tooltip Copy Generator
Concise tooltip text for UI elements and icons
Username Generator
Unique usernames ready for any platform
Would You Rather Generator
Impossible choices for entertaining dilemmas
Children's Story Prompt Generator
Whimsical prompts for kid-friendly stories
Fantasy Writing Prompt Generator
Magical scenarios to launch your fantasy tale
Historical Fiction Writing Prompt Generator
Rich prompts set in pivotal historical moments
Horror Writing Prompt Generator
Spine-chilling scenarios for your next horror story
Literary Fiction Writing Prompt Generator
Character-driven prompts for serious literary fiction
Mystery Writing Prompt Generator
Whodunit scenarios for your detective fiction
Romance Writing Prompt Generator
Heartwarming or passionate romance scenarios
Sci-Fi Writing Prompt Generator
Speculative fiction scenarios for your next story
Thriller Writing Prompt Generator
High-stakes tension scenarios for thriller writers
Yes/No Random Generator
Quick yes or no with optional reasoning
Zodiac-Inspired Name Generator
Names matched to astrological sign traits
Lorem Ipsum Generator
Generate placeholder lorem ipsum text by paragraphs, sentences or words.
Fake Data Generator
Generate fake names, emails and addresses as a table, JSON or CSV.
Random Name Generator
Generate realistic random first and last names instantly.
Gamertag Generator
Generate cool gamertags and usernames with optional numbers and leetspeak.
Placeholder Text by Paragraphs
Generate lorem ipsum filler text by paragraph count.
Type Scale Generator
Build a modular typographic scale and copy the CSS.
Markdown Table Generator
Build aligned Markdown tables from a simple grid.
Random Paragraph Generator
Generate random English paragraphs and sentences for testing and layouts.
Lorem Markdown Generator
Generate placeholder Markdown with headings, lists, quotes, code and tables.
Email Signature Generator
Design a professional HTML email signature and copy it straight into Gmail or Outlook.
Markdown Table of Contents Generator
Paste markdown, get a linked table of contents you can copy or insert.
SWOT Analysis Generator
Build a four-quadrant SWOT matrix and export it as PNG, PDF or Markdown.
Themed Lorem Ipsum Generator
Generate placeholder text in 8 themes — classic Latin, hipster, corporate, pirate and more.
More Text Tools
Markdown Editor with Live Preview
Write Markdown on the left, see it render live on the right.
Resume / CV Builder
Fill in a form, watch a clean resume build live, then export to PDF.
Number to Words Converter — Western & Indian (Lakh/Crore) System
Convert any number to English words in Western or Indian (lakh/crore) format instantly.
Abbreviation & Acronym Expander
Flag every unexpanded acronym in pasted copy (WCAG 3.1.4)
Dyslexia-Friendly Text Preview
Preview your copy with adjustable spacing, line height, and tinted backgrounds.
Error Message Quality Checker
Paste your UI error messages and score them for clarity, actionability and WCAG 3.3.1 / 3.3.3.
Secure File Deletion Guidance Tool
Get OS-specific secure-erase commands for any file type — no file upload needed
GDPR Data Subject Access Request Letter Builder
Generate a legally structured DSAR letter for any UK or EU company in under a minute
Jargon Buster & Plain-English Replacer
Swap 200+ common jargon words and acronyms for plain-English equivalents
Passive Voice Highlighter
Highlight every passive-voice construction in pasted copy and suggest the active form
Password Rotation Scheduler
Enter your services with last-changed dates and get a prioritised rotation calendar
PII Detector & Redactor
Find and mask emails, phone numbers, NINOs, SSNs and card numbers in text
Plain Language Scorer
Flag jargon, passive voice, and long sentences in any draft instantly
Secure Note Self-Destruct (LocalStorage)
Encrypt a note with a passphrase and get a local-only link that self-deletes after one read
Sentence Length Heatmap
Colour-code every sentence in a document by word count for readability scanning
2FA Backup Code Formatter & Printer Sheet
Paste raw backup codes and get a formatted, printable offline storage sheet
Voice-Assistant & Screen-Reader Copy Checker
Paste UI copy and flag patterns that sound confusing when read aloud
ASS / SSA to SRT Converter
Strip ASS override tags and convert to plain SRT subtitles in your browser.
BibTeX to APA 7 Reference List
Paste BibTeX and get a formatted APA 7th edition reference list with hanging indents.
BibTeX to CSL-JSON Converter
Convert BibTeX to Citation Style Language JSON for Pandoc and editors
BibTeX to MLA 9 Reference List
Paste BibTeX and get a formatted MLA 9th edition Works Cited list.
BibTeX to RIS Converter
Convert .bib references to .ris format for EndNote, Mendeley and Zotero.
Citation Style Formatter
Enter citation data and format it in APA, MLA, Chicago, IEEE, and more
CSL-JSON to BibTeX Converter
Convert CSL-JSON citation data back to .bib format
DOI to Citation Formatter
Paste a DOI and get a formatted citation in APA, MLA, Chicago, or BibTeX
HTML Entity Encoder / Decoder
Encode text to HTML entities or decode entities back to plain text.
ICS / iCal Human-Readable Summary
Convert an .ics file into a plain-English summary of all events
ICS / iCal Event Builder
Create .ics calendar event files to import into any calendar app
ICS RRULE Occurrence Expander
List every occurrence of a recurring-event RRULE up to a given date
ICS Calendar Merger
Combine multiple .ics files into one calendar without duplicates
ICS Timezone Shifter
Re-stamp all events in an .ics file from one timezone to another
ICS to CSV Converter
Export iCal events to a CSV spreadsheet for analysis or import
ICS / iCal Validator
Validate .ics files for RFC 5545 compliance and list parse errors
ISO Date Accessibility Formatter
Convert ISO dates into accessible <time> markup with a human-readable label
Locale Date Format Accessibility Checker
Paste date strings and check whether they are unambiguous across locales
Markdown Table to CSV Converter
Extract data from a GitHub-flavoured Markdown table and export it as CSV.
Markdown to Accessible HTML Converter
Convert Markdown to HTML with a main landmark, lang attribute, and h1 injection
RIS to BibTeX Converter
Convert RIS reference files to BibTeX .bib for LaTeX workflows
RRULE / Recurring Event Builder
Build and preview RFC 5545 RRULE strings for recurring calendar events
SRT to ASS / SSA Converter
Convert SRT subtitles to Advanced SubStation Alpha for styled playback
SRT to WebVTT Converter
Convert SubRip .srt subtitle files to WebVTT .vtt for HTML5 video
Text 3-Way Merge
Merge a base file with two diverged edits — resolve conflicts visually
Text Diff (Inline & Side-by-Side)
Compare two text blocks with word- or character-level diff highlighting.
vCard Splitter
Split a multi-contact VCF into one file per contact instantly
vCard (VCF) to CSV Converter
Batch convert contacts from VCF to CSV for spreadsheet or CRM import
WebVTT to SRT Converter
Convert .vtt subtitle files back to .srt for media players and editors
Anglo-Saxon Futhorc Rune Encoder
Encode text using the Old English Futhorc runic alphabet
Arabic ↔ Buckwalter Transliterator
Convert Arabic script to Buckwalter ASCII encoding and back
Armenian Lookalike Text Converter
Replace Latin letters with visually similar Armenian characters
ASCII Art Text (FIGlet-style)
Render text as ASCII art block letters using a built-in font
Chappe Optical Telegraph Encoder
Encode text as French Revolutionary semaphore arm codes
Coin Flipper
Fair digital coin flip with history tracking
Cyrillic Lookalike Converter
Swap Latin letters for near-identical Cyrillic homoglyphs (a→а, o→о, p→р) to demonstrate spoofing.
Devanagari ↔ IAST Transliterator
Convert Devanagari to IAST diacritic Latin and back
Random Diacritic Adder
Sprinkle random accent marks onto text for a stylised look
Elder Futhark Rune Encoder
Transliterate Latin text into the 24 Viking-age Elder Futhark runes by sound.
Enclosed Circle Letter Text
Convert letters and digits to circled characters like Ⓐ ⓑ ① ⑨.
Ethiopic (Ge'ez) Syllable Mapper
Map Latin syllable approximations to Ethiopic Ge'ez characters
Maritime Flag Signal Encoder
Replace letters with their ICS maritime signal-flag names
Fullwidth Text Converter
Convert ASCII to ｆｕｌｌｗｉｄｔｈ Unicode CJK-width characters
English Gematria Calculator
Sum letter values A=1…Z=26 for words and phrases
Hebrew Gematria Calculator
Compute standard gematria value of Hebrew letter strings
Georgian Lookalike Text Converter
Replace Latin letters with visually similar Georgian Mkhedruli characters
Greek Lookalike Converter
Swap Latin letters for similar Greek characters (a→α, b→β, p→ρ, x→χ) for stylistic or spoofing demos.
Greek Numeral System Converter
Convert integers to classical Greek alphabetic numerals
Halfwidth Katakana Converter
Convert fullwidth and Katakana text to halfwidth ASCII-range forms
Hebrew Numeral (Gematria) Converter
Convert integers to Hebrew letter-numerals (gimel=3 etc)
Hiragana ↔ Romaji Converter
Convert Japanese Hiragana to Romaji and back with Hepburn rules
IPA ↔ SAMPA Converter
Convert between IPA Unicode and SAMPA/X-SAMPA ASCII phonetics
IPA to X-SAMPA Converter
Convert Unicode IPA symbols to ASCII X-SAMPA equivalents
Katakana ↔ Romaji Converter
Convert Japanese Katakana to Romaji and back with Hepburn rules
Leet Speak Level 1
Basic substitutions: E to 3, A to 4, I to 1, O to 0, S to 5
Leet Speak Level 2
Extended leetspeak with symbol substitutions for more letters
Leet Speak Level 3 (Extreme)
Max chaos leet — multi-character substitutions, mixed case and symbols
Negative Squared Letter Text
Convert letters to bold negative squared box characters like 🅽🅴🅶.
Number to Words Converter
Convert 42 to forty-two in English (and back)
Ogham Alphabet Encoder
Encode Latin letters into the ancient Irish Ogham script
Old English Style Transformer
Convert text to Fraktur / Blackletter Unicode glyphs
One-Time Pad Simulator
Generate a random key as long as your message and XOR-encrypt with perfect secrecy.
Pinyin Tone Number ↔ Accent Converter
Convert numbered pinyin like han4 to accented hàn and back
Polybius Square with Keyword
Fill the 5x5 grid with a keyword first, then remaining letters
Regional Indicator Symbol Converter
Convert text to 🇦🇧🇨 Discord/emoji regional indicator letters
Roman Numeral Converter
Convert integers to MCMXCIX Roman numerals and back
ROT18 Encoder/Decoder
ROT13 for letters + ROT5 for digits — combined rotation
ROT5 Digit Rotator
Rotate digits 0–4 ↔ 5–9, leave letters unchanged
Younger Futhark Rune Encoder
Transliterate Latin text to the Viking Age 16-rune Younger Futhark
Russian ↔ Latin Transliterator (GOST)
Transliterate Cyrillic Russian to Latin per GOST 7.79-2000
Secret Santa Pairer
Assign secret gift-givers fairly and privately
Semaphore Flag Encoder
Represent each letter as a flag-position description
Small Caps Text Converter
Transform lowercase letters to Unicode small capital letters
Smart Quote Converter
Convert straight quotes to curly typographic quotes or back again
T9 Ambiguous Code Encoder
Convert text to the ambiguous T9 digit sequence with no press counts
Tap Code Dot Visualiser
Show tap code as visual dot grids instead of number pairs
Tap Code Encoder/Decoder
Prisoner knock cipher — encode letters as row and column taps on a 5×5 grid.
Random Team Picker
Fair team assignments from a list of names
Telephone Keypad T9 Encoder
Convert text to phone key presses: ABC=2, DEF=3 with press counts
English to IPA Transcriber
Convert English words to International Phonetic Alphabet notation
Latin Transliterator
Convert Cyrillic, Greek, and other scripts to Latin equivalents
Ubbi Dubbi Transformer
Insert 'ub' before every vowel sound — Zoom TV's secret language
UwU Text Transformer
Twansform text into UwU speak with emotes and substitutions
Wingdings-Style Symbol Mapper
Map each letter to a thematic Unicode dingbat or symbol — a decorative cipher that works on any device.
Palindrome Checker
Check if text reads the same forwards and backwards.
Words to Number Converter
Turn a number written in English words into plain digits.
Number to Words — Indian System (Lakh / Crore)
Spell any number in English using the Indian lakh and crore system.
Number to Words in Spanish (Números en Letras)
Convert any number into Spanish words — correct uno/un, cien, quinientos.
Number to Words in French (Nombres en Lettres)
Convert any number into French words — soixante-dix, quatre-vingts, cent(s).
Number to Words in Portuguese (Números por Extenso)
Convert any number into Portuguese words — cem, cento e, milhão/milhões.
UK Cheque Amount in Words (Pounds & Pence)
Convert a GBP amount into the words to write on a UK cheque.
Indian Cheque Amount in Words (Rupees & Paise)
Convert an INR amount into rupees-in-words for an Indian cheque.
Nigerian Cheque Amount in Words (Naira & Kobo)
Convert an NGN amount into naira-in-words for a Nigerian cheque.
UAE Cheque Amount in Words (Dirhams & Fils)
Convert an AED amount into dirhams-in-words for a UAE cheque.
Words to Number Converter
Convert a number written in English words back into digits.
Add Line Numbers
Prefix every line with a sequential number.
Text Statistics
Counts, sentences, paragraphs and reading time.
Anagram Solver & Checker
Check if two words are anagrams, or list every letter arrangement.
Add Prefix / Suffix to Lines
Add text to the start or end of every line.
Number to Words in Arabic
Convert any number into Modern Standard Arabic words, in your browser.
Number to Words in Armenian
Convert any number into Eastern Armenian words, in your browser.
Number to Words in Georgian
Convert any number into Georgian words — including the base-20 system.
Number to Words in Bengali
Convert any number into Bengali (Bangla) words with lakh and crore.
Number to Words in Urdu
Convert any number into Urdu words with lakh and crore.
Number to Words in Russian
Spell any number in Russian words — instantly, in your browser.
Number to Words in German
Spell any number in German words — instantly, in your browser.
Number to Words in Italian
Spell any number in Italian words — instantly, in your browser.
Number to Words in Turkish
Spell any number in Turkish words — instantly, in your browser.
Number to Words in Chinese
Spell any number in Chinese numerals — instantly, in your browser.
Text to Speech
Read any text aloud in your browser — pick a voice, rate and pitch.
Text to ASCII Art Banner
Turn short text into big block-letter ASCII banners.
Words to Pages Calculator
Convert a word count into an estimated page count.
Reading Level Checker
Flesch–Kincaid grade level and reading ease for any text.
Diff Checker Pro
Compare two texts with line and word-level highlighting, then copy a unified diff.
CSV to Markdown Table
Convert CSV data into a clean Markdown table.
Longest Word Finder
Find the longest words in any block of text.
Scrabble Score Calculator
Add up the tile value of any word instantly.
Words With These Letters
Find every word you can spell from your tiles.
Hangman Word Picker
Pick a fair secret word for a game of hangman.
Word Unscrambler
Turn scrambled letters back into real words.
Basic Rhyme Finder
Find words that rhyme with any common word.
Table to Markdown Converter
Paste TSV, CSV or an HTML table and get a clean Markdown table.
Text to PDF Converter
Paste text or Markdown and download a clean, paginated PDF.
Markdown to Slides
Write a deck in plain Markdown, present it fullscreen, export to PDF.
Flashcard Maker
Build study decks, then flip, shuffle and track what you know.
Markdown Table Editor
Edit tables in a visual grid and get clean GitHub-flavoured Markdown.
Reading Ease Checker
Score any text across 8 readability formulas — instantly in your browser.
Image & PDF Tools
Convert & Compress
HEIC to JPG / PNG / WebP Converter
Convert iPhone HEIC photos to JPG, PNG or WebP — right in your browser.
Image Compressor
Shrink JPG, PNG and WebP images without uploading them.
ICO to PNG Extractor
Extract individual PNG frames from a multi-resolution .ico file.
Image Resizer (Local)
Resize images to exact pixels or a percentage — Canvas-based, no upload.
Image to Base64 Encoder
Convert images to base64 data URIs for CSS, HTML, or JSON embedding.
JPG to PNG Converter
Convert JPG images to lossless PNG — right in your browser, no upload.
PNG to JPG Converter
Convert PNG images to compact JPG — in your browser, with a quality slider.
JPG to WebP Converter
Convert JPG images to smaller WebP — in your browser, with a quality slider.
PNG to WebP Converter
Convert PNG images to smaller WebP — transparency kept, in your browser.
WebP to PNG Converter
Convert WebP images to lossless PNG — transparency kept, in your browser.
WebP to JPG Converter
Convert WebP images to compact JPG — in your browser, with a quality slider.
JPG to AVIF Converter
Convert JPG photos to modern, much smaller AVIF — right in your browser.
PNG to AVIF Converter
Convert PNG images to modern AVIF — smaller files, transparency kept.
GIF to PNG Converter
Convert GIF images to lossless PNG — right in your browser.
BMP to PNG Converter
Convert uncompressed BMP bitmaps to smaller, lossless PNG.
Image to Base64 Data URI
Turn any image into a base64 data URI for HTML, CSS or Markdown.
Image Resize Tool
Resize images to exact pixel dimensions — locally, no upload.
Image to PDF
Turn a JPG, PNG or WebP into a single-page PDF — no upload.
PNG to ICO Converter
Turn a PNG into a multi-size Windows .ico favicon — in your browser.
JPG to ICO Converter
Turn a JPG into a multi-size Windows .ico icon — in your browser.
SVG to PNG Converter
Rasterise SVG vector files to crisp PNG at any size — in your browser.
SVG to JPG Converter
Rasterise SVG vector files to compact JPG at any size — in your browser.
GIF to WebP Converter
Convert GIF images to smaller WebP — in your browser, with a quality slider.
AVIF to JPG Converter
Convert modern AVIF images to widely-compatible JPG — in your browser.
HEIC to PNG Converter
Convert iPhone HEIC photos to lossless PNG — right in your browser.
HEIC to WebP Converter
Convert iPhone HEIC photos to compact WebP — right in your browser.
WebP to GIF Converter
Convert WebP images to GIF — entirely in your browser, no upload.
TIFF to JPG Converter
Convert TIFF images to JPG — decoded and encoded in your browser.
AVIF to PNG Converter
Convert AVIF images to lossless PNG — transparency kept, in your browser.
Compress Image to Target Size
Shrink a photo to a target file size, e.g. under 200 KB.
PDF to Images Converter
Render every PDF page to a PNG or JPG and download them in one click.
Images to PDF Converter
Combine many photos or scans into one PDF — reorder, set page size and margins.
Compress PDF
Shrink a PDF in your browser — see the before and after size, then download.
Batch Image Converter
Convert many images to WebP, JPG or PNG at once and download a single zip.
Batch Image Resizer
Resize many images at once and download them all as a ZIP.
Image to ASCII Art Converter
Turn any photo into monospace ASCII art — copy, download as text or PNG.
SVG to PNG Converter (Batch, Scale & Transparent)
Rasterise one or many SVG files to crisp PNG at any scale or exact size.
Image Format Converter
Convert PNG, JPG and WebP both ways with a quality slider and batch zip download.
Edit
Image Metadata Redactor
Bulk-scrub EXIF from multiple images in one drop — private by design
Screenshot Redactor (Blur / Blackbox)
Draw blur or black boxes over sensitive areas before sharing screenshots
Image Crop Tool
Crop JPG, PNG and WebP images in your browser — no upload.
Rotate & Flip Image
Rotate and mirror images in 90° steps — privately, no upload.
Image Watermark Adder
Add a text watermark to photos — right in your browser.
Blur & Redact Image
Blur or black-box sensitive parts of an image privately.
Photo Border Adder
Add a clean solid-color border around any photo.
Sepia Photo Filter
Give any photo a warm vintage sepia tone with adjustable intensity.
Image Editor
Crop, rotate, adjust, filter and add text to images — all in your browser.
SVG Optimizer & Editor
Paste an SVG, minify it, inspect its dimensions, then copy or download the optimized file.
PDF Redactor
Draw black boxes over a PDF and flatten the hidden text away — in your browser.
Image Border & Frame Maker
Add a solid or gradient border, rounded corners and a drop shadow, then export a PNG.
Image Rounded Corners and Shadow Tool
Round corners, add a drop shadow and export a transparent PNG.
Image Redactor
Draw blur, pixelate or black boxes over sensitive parts of an image and export it.
Image Duotone Maker
Turn any photo into a two-colour duotone and export a high-res PNG.
CSS Filter Playground
Tune blur, brightness, contrast, saturate, hue and more on a live image — then copy the CSS.
Image Crop & Straighten
Crop to any selection and straighten a tilted photo by fine degrees, then export.
PDF Tools
Split PDF & Extract Pages
Pick page ranges, click thumbnails, and export selected pages — no upload.
PDF Page Organizer
Reorder, rotate, duplicate and delete PDF pages with drag-and-drop thumbnails.
Extract Images from PDF
Pull every embedded photo, logo and figure out of a PDF and save them as a ZIP.
PDF Page Reorder Tool
Drag pages into a new order and download a rearranged PDF.
PDF Page Extractor
Pick a page range and save just those pages as a brand-new PDF.
Makers & Generators
Avatar Identicon Generator
Unique geometric avatars from any string input
Barcode Generator (EAN-13)
Generate a real EAN-13 retail barcode with an automatic check digit.
Organic Blob SVG Generator
Amorphous SVG blobs for modern backgrounds
Dark Mode Color Palette Generator
Moody, readable dark-UI palettes ready to use
Earth Tone Palette Generator
Natural, grounded earth-tone color palettes
Jewel Tone Palette Generator
Rich, saturated jewel-tone palettes
Monochromatic Palette Generator
Elegant single-hue palettes with tints and shades
Neon Color Palette Generator
Electric neon palettes for bold, vibrant designs
Nordic/Scandi Color Palette Generator
Cool, minimalist palettes from the Nordic tradition
Pastel Color Palette Generator
Soft, calming pastel palettes for gentle designs
Sunset Color Palette Generator
Warm gradient palettes inspired by golden hour
Tropical Color Palette Generator
Vibrant tropical palettes bursting with energy
Vintage Color Palette Generator
Faded, nostalgic palettes from past decades
CSS Animation Generator
Copy-paste CSS keyframe animations
CSS Neumorphism Generator
Soft-UI neumorphic shadow CSS generator
Font Pairing Generator
Curated Google Font pairings for any design style
Geometric Pattern SVG Generator
Repeating geometric SVG patterns for backgrounds
Gradient Mesh Generator
Trendy mesh gradient CSS for modern backgrounds
Isometric Grid SVG Generator
Isometric dot and line grids for technical diagrams
Noise Texture SVG Generator
SVG noise and grain textures for backgrounds
Placeholder Image Spec Generator
Make instant SVG placeholder images for wireframes and layout mockups.
Print-Safe CMYK Color Palette Generator
Colors that survive the screen-to-print conversion
QR Code Generator (URL)
Instant QR codes for any web URL
QR Code Generator (vCard)
Contact card QR codes for business cards
QR Code Generator (Wi-Fi)
Make a scannable Wi-Fi QR code so guests join your network instantly.
UI Animation Concept Generator
Motion design concepts for interface transitions
Color-Blind Safe Palette Generator
Accessible palettes for all forms of color vision
Random Color Name Generator
Evocative color names beyond red and blue
WCAG-Accessible Color Palette Generator
Color palettes that pass contrast accessibility checks
Brand Identity Color Set Generator
Primary, secondary, and accent sets for brand decks
Brand Gradient Generator
On-brand gradient definitions for marketing assets
Gradient Color Map Generator
Sequential and diverging color maps for data viz
Full Color System Generator
Complete brand color system with semantic tokens
Typographic Scale Generator
Harmonious font size scales for design systems
Multi-Stop Gradient CSS Generator
Complex multi-stop CSS gradients ready to use
Random Hex Color Generator
Random hex codes with instant preview
Icon Concept Generator
Icon brief concepts for designers to illustrate
Icon Set Concept Generator
Thematic icon set briefs for illustrators
Illustration Concept Generator
Scene briefs for custom product illustrations
Logo Concept Generator
Logo direction briefs combining type and mark ideas
Random RGB Color Generator
RGB triplets for CSS, canvas, and design tools
UI Layout Concept Generator
Page layout brief concepts for UI designers
SVG Pattern Generator
Tileable SVG patterns for backgrounds and textures
CSS Text Shadow Generator
Creative text-shadow effects for headings and UI
CSS Transform Generator
CSS transform strings for rotation, skew, and scale
Wave SVG Generator
Smooth wave dividers for section separators
Code 128 Barcode Generator
Create scannable Code 128 barcodes from text or numbers in your browser.
Random Color Generator
Generate random colors with HEX, RGB and HSL values.
QR Code Generator with Logo
Make a branded QR code with your logo in the centre, custom colours and a high-resolution PNG download.
OG / Social Image Maker
Design a 1200×630 social share image and export a crisp PNG.
Business Card Designer
Design a two-sided business card and export print-ready PNG and PDF.
Letterhead Maker
Design a company letterhead and export a print-ready PNG header and PDF page.
Passport & ID Photo Maker
Crop your photo to any country size and export a ready-to-print sheet.
Photo Collage Maker
Combine your photos into a grid collage and export a high-res PNG.
Quote Image Maker
Turn any quote into a share-ready square and story poster.
Batch QR Code Generator
Turn a list of notes or links into many QR codes at once.
Certificate Maker
Design a printable certificate and export it as PNG or PDF.
Meme Maker Pro
Add top, bottom and custom captions to any image, then export a PNG.
YouTube Thumbnail Maker
Design a 1280x720 YouTube thumbnail and export it as a PNG.
Device Mockup Generator
Drop a screenshot into a phone, tablet, laptop or browser frame and export a PNG.
Receipt Maker
Build an itemised sales receipt and export it as PNG or PDF.
Screenshot Beautifier
Drop a screenshot, add a gradient background, padding, rounded corners and a shadow, then export a polished PNG.
Sprite Sheet Maker
Drop frames, arrange them in a grid and export a sheet PNG plus a JSON atlas.
Coupon & Voucher Maker
Design a branded discount coupon and export it as a PNG.
ID & Membership Card Maker
Design a front-and-back ID card, add a photo, export PNG and a print-ready PDF sheet.
Seating Chart Maker
Lay out tables, assign every guest to a seat, and export a clean PNG.
ASCII Art Generator
Turn any image into copy-and-paste ASCII text art.
Meme Generator
Upload an image, add classic outlined top and bottom captions, export a PNG.
Animated GIF Maker
Turn a sequence of images into one looping animated GIF.
Batch QR Code Generator
Paste a list or CSV and download one QR code per row as a single zip.
Contact Sheet Maker
Turn many photos into one printable thumbnail grid with filenames, then export PNG.
Sprite Sheet Slicer
Upload a sprite sheet, set rows and columns or a cell size, and export every frame as a ZIP.
Graph Paper Generator
Make printable square, dot, isometric, hex or log paper and export a vector PDF.
Nonogram Generator (Picross / Hanjie Puzzles)
Generate logic-solvable nonogram puzzles and print them with an answer key.
SVG Wave Generator
Build layered animated or static SVG wave dividers and export the markup.
SVG Blob Generator
Create random organic blob shapes and download them as SVG or PNG.
Material Palette Generator
Turn one base colour into a full 50–900 palette with tints, shades and tones.
Color from Image
ICC Color Profile Viewer
Inspect the embedded ICC color profile in a JPEG, PNG, or TIFF file.
Color Picker from Image
Click any pixel to grab its HEX and RGB color.
Invert Image Colors
Create a photographic negative by inverting an image's colours.
Color Contrast Grid
Paste a palette and see every text/background pair scored against WCAG AA and AAA.
Image Color Extractor
Pull the dominant colour palette and hex codes out of any image.
Color Name Finder
Find the nearest named CSS colour, plus complementary and harmony shades.
Image Color Blindness Simulator
Upload a photo or design and preview it under protanopia, deuteranopia and tritanopia.
Color Palette Extractor
Pull the dominant colors out of any image — with hex, RGB, HSL and exports.
More Image Tools
EXIF Viewer & Metadata Stripper — See & Remove Hidden Photo Data
Read camera, date and GPS data buried in your photo — then strip it before sharing.
EXIF Scrubber (Privacy Cleaner)
Strip all metadata from photos before sharing — GPS, camera, dates
Image Diff (Pixel-Level)
Compare two images pixel-by-pixel and highlight differences
Image Steganography Detector
Detect hidden LSB data in PNG or BMP images using statistical analysis.
Image to Grayscale
Convert images to black & white or sepia — privately, no upload.
Flip & Mirror Image
Mirror a photo horizontally or vertically instantly.
Base64 to Image
Decode a Base64 string or data URI back into a viewable image.
Image to Grayscale / Black & White
Convert any photo to greyscale or pure 1-bit black and white.
Brightness & Contrast Adjuster
Fine-tune any photo's brightness and contrast with live sliders.
Aspect Ratio Calculator
Find a ratio and scale dimensions while keeping it locked.
Screen Resolution Checker
See your screen resolution, pixel ratio and aspect ratio live.
DPI / PPI Calculator
Pixel density from resolution and diagonal screen size.
Image Dimension Scaler
Resize image dimensions by percent or target size, ratio locked.
Viewport Size Checker
Live browser viewport size, breakpoint and scrollbar width.
EXIF Remover (Batch)
Strip EXIF, GPS and all hidden metadata from many photos at once, then download a ZIP.
Instagram Grid Splitter
Split one image into a perfectly aligned 3x3 or 1x3 Instagram feed and download a ZIP of tiles.
Document Scanner
Turn a phone photo of a document into a clean, high-contrast scan and export a PDF.
EXIF Metadata Stripper
Remove EXIF, GPS and camera metadata from a photo — entirely in your browser.
Everyday & Quick-Help Apps
Trackers & Planners
Time Zone Meeting Planner
Pick a meeting time in one zone and see it across cities worldwide.
Keyboard Shortcuts Reference
Essential macOS and Windows keyboard shortcuts, side by side and searchable.
Initiative Tracker
Track combat turn order and HP for tabletop RPG encounters.
Kanban Board
A drag-and-drop task board that saves to your browser — no account, no sync.
Habit Tracker
Build streaks with a weekly and monthly grid that saves in your browser.
Name Numerology Calculator
Find the numerology numbers hidden in your name.
Reading List Tracker
Track books with status, star ratings, page progress and notes — export anytime.
Eisenhower Matrix
Sort tasks into do, schedule, delegate or delete.
Time Blocking Planner
Build a back-to-back schedule of focused time blocks.
Weekly Goal Tracker
Track progress toward your weekly targets with live bars.
Focus Session Logger
Log focus sessions with duration and a quality rating.
Keyboard Symbols Reference
What ⌘ ⌥ ⇧ ⌃ and the other key symbols mean.
Roman Numerals Chart
Convert numbers to Roman numerals, plus a full chart.
Content Calendar Planner
Plan a month of posts across every channel and export to CSV.
Mood Tracker & Daily Journal
Log your daily mood and notes, then see streaks and a monthly heatmap.
OKR Tracker
Track objectives and measurable key results with quarterly progress.
Packing List Builder
Build a reusable travel checklist with categories, quantities and ready-made templates.
Chore Chart Maker
Build a weekly household chore chart with points, checkboxes and a leaderboard.
Gift List Tracker
Plan presents per person, track status and stay inside every budget.
Meeting Agenda Builder
Plan a timed meeting agenda with owners, running times and a one-click PDF.
Pros and Cons List Maker
Weigh each pro and con, compare options and get a clear verdict.
Packing List Maker
Build a categorised packing checklist, tick off items and track progress.
Travel Itinerary Builder
Plan a trip day by day, reorder activities and export a clean PDF.
Timers
Online Timer, Stopwatch & Pomodoro
A countdown timer, stopwatch and Pomodoro focus timer in one tab.
Pomodoro Timer
Run 25/5 focus cycles with automatic breaks and a session counter.
Online Stopwatch
Start, stop and lap an accurate stopwatch with hundredths of a second.
Countdown to Date
Live countdown of days, hours, minutes and seconds to any date and time.
Box Breathing Timer
A guided 4-4-4-4 breathing timer with an animated visual pacer.
Stopwatch with Lap Timer
An accurate online stopwatch that records lap and split times.
Interval Timer (HIIT)
Work / rest interval timer for HIIT, Tabata and circuits — with audio cues.
HIIT Interval Timer
Build work/rest rounds and sets, then run a big countdown with audio cues.
Generators & Pickers
QR Code Generator
Create custom QR codes for URLs, text and more — download as PNG or SVG.
Password Generator
Secure passwords and passphrases — generated entirely in your browser.
WiFi QR Code Generator
Make a QR code that connects guests to your WiFi in one scan.
vCard QR Code Generator
Turn your contact details into a scannable digital business card.
Calendar Event QR Code Generator
Let people add your event to their calendar with one scan.
Geo Location QR Code Generator
Encode coordinates into a QR code that opens in any maps app.
Email QR Code Generator
Make a QR code that opens a prefilled email in one scan.
SMS QR Code Generator
Make a QR code that opens a prefilled text message in one scan.
Random Number Generator
Cryptographically strong random numbers in any range.
Dice Roller
Roll d4 to d100 with modifiers — fair and instant.
Random Team Picker
Split a list of names into fair, balanced teams.
Lottery Number Picker
Generate lucky lottery numbers for any draw format.
Random Card Draw
Draw playing cards from a fair, shuffled deck.
Crypto Address QR Code Generator
Turn a wallet address into a scannable QR code for fast payments.
Phone Number QR Code Generator
Make a QR code that dials a number with one scan.
App Link QR Code Generator
Turn an App Store or Play Store link into a scannable QR code.
PayPal.Me QR Code Generator
Make a QR code that opens your PayPal.Me payment page.
Secret Santa Picker
Draw fair Secret Santa pairings where nobody gets themselves.
Wheel of Names Spinner
Spin a colourful wheel to pick a random name or option.
Random Quote Generator
Get a random inspirational quote with one click.
White Noise Generator
Play white, pink or brown noise — synthesised locally for focus or sleep.
Random Fact Generator
One tap for a surprising, true "did you know?" fact.
Would You Rather Picker
Endless "would you rather" dilemmas for any group.
Business Card QR Code Generator
Turn your contact details into a scannable vCard QR code for your card.
Spotify Link QR Code Generator
Make a scannable QR code for any Spotify track, album or playlist.
YouTube Link QR Code Generator
Create a scannable QR code for any YouTube video, playlist or channel.
Instagram QR Code Generator
Make a scannable QR code for your Instagram profile, post or reel.
WhatsApp Click-to-Chat QR Code Generator
Make a QR code that opens a WhatsApp chat with a prefilled message.
D&D Dice Roller
Roll dice notation like 2d6+3 or 4d6kh3 — fair and instant.
RPG Loot Generator
Roll treasure hoards — coins, gems and magic items by tier.
Fantasy Name Generator
Generate fantasy names for elves, dwarves, orcs and more.
Random Emoji Picker
Pick random emoji by category — with a no-repeats option.
Bingo Card Generator
Print random 75-ball bingo cards — B, I, N, G, O.
Sudoku Generator
Generate unique-solution sudoku puzzles — easy, medium, hard.
Maze Generator
Create printable mazes with one solution path — small to large.
Word Search Generator
Hide your own words in a printable word search grid.
Lucky Number Generator
Pick lucky numbers for any range — lottery, draws or games.
Decision Spinner
Can''t decide? Add your options and let the spinner choose.
Random Team Name Generator
Punchy two-word team names for sports, quizzes, gaming and work.
Tournament Bracket Generator
Build a single-elimination bracket, seed or shuffle, and crown a champion.
Tournament Bracket Generator
Build a seeded single-elimination bracket, record scores and export to PDF or SVG.
Reference
Guitar Tuning Reference
String-by-string note names and frequencies for common guitar tunings.
Zodiac Signs Reference
All 12 zodiac signs with dates, elements, qualities and ruling planets.
Currency Symbols Reference
Currency symbols with ISO codes, names and countries — searchable.
Planetary Data Reference
Diameter, mass, gravity, orbit and moons for every planet.
Greek Alphabet Reference
All 24 Greek letters with names, pronunciation and uses.
Metric Prefixes Reference
Every SI prefix from quetta to quecto, with powers of ten.
More Apps
Coin Flip
Flip one or many coins — fair heads or tails.
Online Metronome
A clickable metronome from 20 to 300 BPM with accented downbeats.
Password Strength Tester
Check how strong a password really is — entropy, crack time and fixes.
World Clock — Multiple Cities
See the current time across multiple cities and time zones at once.
Online Alarm Clock
Set an alarm in your browser — the tone is generated locally, no app needed.
World Clock — Multiple Time Zones
Compare the current time across any IANA time zones, side by side.
Magic 8 Ball
Ask a question, shake the ball, get one of 20 classic answers.
Love Compatibility Calculator
Enter two names for a just-for-fun compatibility score.
Yes or No Oracle
Ask anything and get a clear Yes, No, or Maybe.
Tap Tempo
Tap along to any beat to find its tempo in BPM.
Character Stat Roller
Roll D&D ability scores — 4d6 drop lowest, with modifiers.
Birthstones by Month
Modern and traditional birthstones for every month, with meanings.
Anniversary Gifts by Year
Traditional and modern wedding anniversary gifts for each year.
Crossword Grid Maker
Design a blank crossword grid with auto clue numbering.
Rock Paper Scissors
Play rock paper scissors against the computer — fair and instant.
Fortune Cookie
Crack a virtual fortune cookie for a message and lucky numbers.
Coin Flip Streak Simulator
Flip many coins at once and see the longest run of heads or tails.
ICS Calendar Event Builder
Build a real .ics calendar file and add events to Google or Outlook in one click.
vCard Builder — Create a .vcf Contact File and QR Code
Build a full vCard, download the .vcf, and get a scannable contact QR.
Recipe Manager
Save recipes, scale servings and build a tidy shopping list — all offline.
AI Tools
All
LLM API Cost Calculator
Estimate the cost of any GPT, Claude or Gemini API call — per request and per month.
Acronym Expander Prompt Builder
Build prompts that expand all domain acronyms in technical documents
Active Prompt Optimizer
Iteratively test and improve a prompt using model feedback
ADetailer Face & Hand Fix Guide
Configure ADetailer for automatic face and hand inpainting in SD
Adobe Firefly Prompt Builder
Build commercially safe Firefly prompts with style and reference guidance
Adversarial Prompt Tester
Generate adversarial inputs to stress-test your prompt's robustness
AI Agent System Prompt Builder
Build a complete autonomous agent system prompt with tools and loop
Agent Loop Cost Simulator
Simulate how costs spiral in a ReAct / tool-use agent loop
AI Acceptable Use Policy Scorer
Score your existing AI AUP against best practice benchmarks
A/B Prompt Tester (BYO Key)
Compare two prompt variations against the same LLM
AI Tool Access Revocation Checklist
Offboarding checklist for revoking AI tool access when staff leave
Accessibility Audit Prompt Builder
Build AI prompts for WCAG accessibility content reviews
AI Output Accessibility Checker
Flag accessibility issues in AI-generated web content and code
Accountant & Bookkeeper Prompt Pack
AI prompts for client letters, reconciliations, and tax summaries
AI Accountability Register Template
Generate an AI system accountability register for your organization
AI Adoption Readiness Checklist
Score your organisation's AI readiness across 30 points in 3 minutes
AI Agent Escalation Policy Generator
Design a human-in-the-loop escalation policy for AI agents
Creative Agency Prompt Pack
AI prompts for briefs, concepts, scripts, and campaign strategy
AI Agent Design Planner
Design the architecture of your AI agent before writing code
API Documentation Prompt Builder
Build AI prompts for clear, developer-friendly API docs
Annual Report Narrative Prompt Builder
Build AI prompts for compelling annual report chairman letters
AI API Rate Limit Security Advisor
Design rate limits and abuse controls for AI API endpoints
Architect & Engineer Prompt Pack
AI prompts for specs, design reviews, reports, and RFPs
AI Art NFT Metadata Builder
Build ERC-721 metadata JSON for AI-generated artwork NFTs
AI Automation Opportunity Scanner
Paste your job description — see which tasks AI can handle
Batch Prompt Runner (BYO Key)
Run one prompt against a list of inputs — download results as CSV
AI Benchmarking Glossary
Decode MMLU, HumanEval, HellaSwag, and every AI benchmark
AI Bias Impact Assessment
Structured impact assessment for AI systems affecting protected groups
AI Bias Glossary & Reference
Comprehensive offline glossary of AI bias types and definitions
Blog Post Generator (BYO Key)
Turn a topic and outline into a full blog post with your LLM
AI Boilerplate Stripper
Remove 'As an AI…', disclaimers, and filler from LLM output.
Brand Messaging Framework Builder
Build a brand messaging house with AI prompts for each layer
Brand Tone Analyzer
Paste any copy and see tone, formality, warmth and confidence scores
Budget Narrative Prompt Builder
Build AI prompts for grant and project budget justifications
AI Budget Planner
Plan your monthly AI spend across tools, APIs, and compute
Case Study Prompt Builder
Turn customer data into compelling case study copy with AI
AI Capability Matrix
Which model does code, vision, audio, search, or agents best?
Change Management Prompt Pack
AI prompts for change communications, FAQs, and training plans
Chatbot Conversation Flow Designer
Map your chatbot conversation and generate a prompt for every node
AI Chatbot Privacy Notice Generator
Generate a GDPR-compliant privacy notice for your AI chatbot
AI Chat Log Anonymizer
Anonymize AI chat logs for safe sharing, research & debugging
AI & Children's Data Compliance Checklist
COPPA, GDPR-K & UK AADC checklist for AI products used by minors
Children's AI Chatbot Safety Assessment
Safety assessment checklist for AI chatbots used by children
Churn Analysis Prompt Builder
Build AI prompts for diagnosing why customers leave
AI-Assisted Code Review Security Checklist
Security checklist for reviewing AI-generated code before deployment
AI Coding Assistant Comparison
Compare Cursor, GitHub Copilot, Continue, Cody, and more
Code Reviewer (BYO Key)
Get an AI code review for any language in seconds
Cold Email Prompt Builder
Build personalised cold email AI prompts for any ICP
Competitive Analysis Prompt Pack
AI prompts for competitive teardowns, SWOT, and gap analysis
Product Name & Tagline Generator (BYO Key)
Generate 20 product names and taglines for any idea
AI Compliance Readiness Checker
Check your AI deployment against EU AI Act, GDPR, and CCPA
AI Feature Consent Text Generator
Generate GDPR-compliant consent text for AI-powered product features
Consultant Prompt Pack
AI prompts for decks, frameworks, diagnostics, and deliverables
AI Content Age-Gating Advisor
Assess age-verification obligations for AI-generated content features
AI Content Authenticity Disclosure Generator
Generate platform-specific AI content disclosure statements
AI Content Detector Explainer
Understand how AI text detectors work and why they fail
AI Knowledge Cutoff & Freshness Checker
Check if your AI query may be affected by knowledge cutoff gaps
AI Content Moderation Policy Generator
Draft a content moderation policy for AI-generated user content
AI Content Monetization Rights Checker
Check if you can legally monetize AI-generated content
AI Content Label HTML Generator
Generate embeddable HTML labels for AI-assisted content pages
Content Safety Checker (BYO Key)
Check any text for harmful, biased, or policy-violating content
AI Watermark Resistance Checker
Test how resistant AI content watermarks are to common edits
Contract Summary Prompt Builder
Build AI prompts that extract key terms from any contract
AI Contract Clause Library
Browse and copy standard AI-specific clauses for contracts
AI Contractor Agreement Clauses Generator
Generate AI-specific clauses for contractor and freelancer agreements
AI Copyright Policy Generator
Draft a copyright policy for AI-generated content at your company
AI Cost Optimisation Guide
10 proven tactics to cut your AI API bill by up to 80%
Chain-of-Thought Prompt Builder
Turn simple questions into step-by-step reasoning prompts
AI Cost-per-Decision Calculator
Calculate the LLM cost of each automated business decision
AI Cover Song Arrangement Guide
Prompt Suno and Udio to create AI covers of songs in different styles
Crisis Comms Prompt Builder
Draft AI-assisted crisis statements for any scenario
AI Safety Incident Crisis Communication Template
Draft stakeholder communications after an AI safety incident
Fine-Tune Training Data Builder (BYO Key)
Generate JSONL training pairs for fine-tuning your own LLM
AI Customer Data Use Policy Generator
Draft a customer-facing policy on how you use AI with their data
AI Customer Persona Builder
Build research-backed customer personas with AI assistance
AI Customer Support Macro Builder
Build a library of AI-ready response macros for your support team
Customer Win-Back Prompt Builder
Build AI prompts for re-engagement campaigns that convert
Debate & Argument Generator (BYO Key)
Generate steel-man arguments for both sides of any position
Data Analyst Prompt Pack
AI prompts for SQL, dashboards, reports, and data storytelling
AI Data Residency Checker
Check where your AI provider stores data by region and tier
AI Deceptive Design Pattern Detector
Identify dark patterns in AI-powered UX flows
AI Decision Audit Trail Template
Generate an audit trail template for AI-assisted decisions
AI-Assisted Decision Matrix Builder
Weigh options and criteria — let AI help you decide
AI Deepfake Detection Guide
Interactive guide to detecting AI-generated images, audio & video
Product Demo Script Prompt Builder
Build AI prompts for converting product demos
AI SDK Dependency Vulnerability Advisor
Common vulnerability patterns in AI SDK integrations
AI Feature Deployment Checklist
Before you ship any AI feature — run this 30-point checklist
AI Discrimination Test Builder
Build A/B test cases to detect discriminatory AI outputs
AI Disclosure Label Generator
Generate copy-paste disclosure labels for AI-assisted content
AI Disinformation Risk Analyzer
Assess disinformation risk of an AI application or output
AI Document Intelligence Comparison
Compare Textract, Azure DI, Google Document AI, and more
Document Summarizer (BYO Key)
Paste any document — get a concise AI summary instantly
AI Data Protection Impact Assessment (DPIA) Template
Generate a GDPR-required DPIA template for AI processing activities
AI Election Content Safety Checker
Flag AI-generated content that may violate election integrity rules
Email Drip Sequence Prompt Builder
Design a multi-email nurture sequence with ready-to-use AI prompts
Email Reply Generator (BYO Key)
Paste an email — get 3 reply options in different tones
Email Tone Checker
Paste an email — instantly check if the tone lands right
Embedding Model Comparison Table
Compare text embedding models by dimensions, cost, and MTEB score
AI Privacy & Safety Employee Training Quiz
Interactive employee quiz on safe AI tool use at work
AI in Employment Decisions Checklist
Compliance checklist for using AI in hiring, performance & termination
AI Environmental Impact Estimator
Estimate the carbon cost of your AI usage for sustainability reporting
ESG Reporting Prompt Builder
Build AI prompts for sustainability and ESG disclosures
AI Ethics Review Board Charter Generator
Draft a charter for an internal AI ethics review committee
AI Evaluation Framework Builder
Design a rigorous eval harness for your AI feature
AI Output Evaluation Rubric Generator
Generate a scoring rubric for evaluating AI output quality
AI Incident Evidence Preservation Checklist
Preserve the right evidence after an AI safety or privacy incident
AI Explainability & Transparency Checklist
Assess explainability requirements for your AI system
Explainer Video Script Prompt Builder
Build AI prompts that write tight 60-90 second explainer scripts
AI Explainable Output Template Generator
Generate explainable AI output templates with uncertainty disclosure
Facial Recognition & Biometric AI Policy Generator
Draft a policy for biometric AI use compliant with EU AI Act
Fact-Check Prompt Builder (BYO Key)
Build AI prompts that critically evaluate any factual claim
AI Fact-Check Claim Extractor
Extract verifiable factual claims from AI output for manual checking
FAQ Page Prompt Builder
Generate comprehensive FAQ pages with AI — prompt included
Few-Shot Example Builder
Create input/output example pairs that improve AI accuracy
Finance Team Prompt Pack
AI prompts for reports, forecasts, variance analysis, and memos
AI Freelancer NDA Clauses Generator
Generate NDA clauses for freelancers using AI tools with client data
GDPR Article 22 Automated Decision Notice Generator
Generate the legally required notice for automated decision-making
AI-Generated Image Metadata Checker
Check image EXIF/IPTC metadata for AI generation indicators
AI Data Breach Notification Template
72-hour GDPR breach notification template for AI data incidents
AI Governance Framework Builder
Build a lightweight AI governance framework for your organisation
AI Governance Maturity Assessment
Score your organization's AI governance practices against a framework
AI Governance Policy Repository Builder
Build a structured AI governance policy repository for your organization
AI Hallucination Risk Checker
Score your use case for hallucination risk and get targeted mitigations
Healthcare Admin Prompt Pack
AI prompts for appointment comms, consent forms, and referrals
AI in Healthcare Compliance Checklist
Regulatory checklist for AI systems used in clinical settings
AI HR Decision Output Bias Checker
Spot demographic bias patterns in AI-generated HR recommendations
AI Image Metadata Viewer
Extract and display embedded generation parameters from SD and Midjourney images
AI Image Generation Model Comparison
Compare DALL-E, Midjourney, Flux, Stable Diffusion side-by-side
Image Prompt Refiner (BYO-key)
Refine your DALL-E / Midjourney / Stable Diffusion prompt for better results.
AI Image Prompt Translator
Translate image prompts between Midjourney, SD, and DALL·E syntax conventions
AI Image Workflow Total Cost Tracker
Track total cost of a multi-step AI image workflow across generation and editing
AI Incident Post-Mortem Template
Structured blameless post-mortem template for AI safety incidents
Incident Post-Mortem Prompt Builder
Build blameless post-mortem reports with AI assistance
AI Incident Response Template Generator
Generate a ready-to-use AI incident response runbook
AI Incident Severity Classifier
Classify AI safety incidents by severity and required response timeline
AI in Your Industry Glossary Builder
Generate a plain-English AI glossary tailored to your industry
AI Interview Question Generator
Generate structured interview questions and rubrics for any role
Investor Update Prompt Builder
Build AI prompts for monthly investor updates that build trust
AI Jailbreak Resistance Self-Test
Test how well your AI system prompt resists common jailbreak patterns
Journalist & Writer Prompt Pack
AI prompts for research, outlines, interviews, and articles
Knowledge Base Article Prompt Builder
Build AI prompts for clear, scannable help centre articles
Landing Page Copy Prompt Builder
Build AI prompts for hero copy, benefits, and CTA sections
Knowledge Transfer Prompt Builder
Build AI prompts for documenting expert knowledge before handover
GDPR Lawful Basis Selector for AI Processing
Choose the right GDPR lawful basis for your AI data processing
AI Learning Roadmap Builder
Build a personalised AI skills roadmap for your role
Legal Professional Privilege & AI Advisor
Assess privilege risk when using AI for legal work
Lessons Learned Prompt Builder
Capture and structure project lessons with AI assistance
LinkedIn Thought Leadership Prompt Pack
AI prompts for authority-building LinkedIn posts and articles
Live Prompt Tester (BYO Key)
Test prompts against real LLMs with your own API key
AI Localization & Cultural Bias Checker
Flag WEIRD-centric assumptions in AI outputs for global use
Localisation Prompt Builder
Build AI prompts for adapting content to any market
AI Meeting Notes Template Builder
Design a notes template that AI fills in perfectly every time
Market Entry Strategy Prompt Pack
AI prompts for market sizing, entry analysis, and go-to-market
Meeting Transcript Summarizer (BYO Key)
Paste a transcript — get action items, decisions, and owners
AI Mental Health Content Safety Checker
Flag AI output that may be harmful to users in mental health crisis
AI Misinformation Risk Checklist
Assess misinformation risk before publishing AI-generated content
AI Model Card Generator
Generate a model card documentation template for your AI system
AI Model Changelog Digest
Stay up to date on every major LLM release in one reference
AI Model Deprecation Tracker
Track model deprecation dates so you're never caught off-guard
AI Model Comparison Table
Compare GPT-4o, Claude, Gemini, Llama side-by-side instantly
AI Model Lineage Tracker
Document the lineage and dependencies of AI models in your stack
AI Model Selection Wizard
Answer 7 questions — get your best LLM with reasoning
AI Model Version Change Log Generator
Generate a changelog template for AI model version updates
Negotiation Prompt Pack
AI prompts for prep, anchoring, and counter-offer emails
Newsletter Digest Prompt Builder
Build AI prompts that summarise industry newsletters into digests
AI Provider Marketing Opt-Out Guide
Opt out of AI provider marketing emails and product communications
AI Newsletter & Email Disclosure Template
Generate FTC-compliant disclosure templates for AI-written newsletters
AI Decision Newspaper Test
Would your AI decision feature make headlines? Test it here.
Nonprofit & NGO Prompt Pack
AI prompts for grant writing, donor comms, and impact reports
Sales Objection Handler Prompt Builder
Build AI prompts for every objection your sales team faces
AI OKR Generator
Turn your AI strategy into measurable OKRs instantly
AI Tool Onboarding Checklist Builder
Build a new-hire AI tool onboarding plan for any role
Employee Onboarding Email Sequence Builder
Design a 30-day onboarding email series with AI writing prompts
Operations Prompt Pack
AI prompts for process docs, supplier comms, and incident reports
AI Training Opt-Out Email Template Library
Copy-paste opt-out emails for 20+ AI providers
AI Training Data License Checker
Check if open data sources you use for AI training are properly licensed
AI Output Confidence Language Analyzer
Flag hedging and false certainty in AI-generated text
AI Output Diff
Side-by-side diff two LLM responses to spot changes and regressions.
AI Output Disclaimer Generator
Generate legal-style disclaimers for AI-generated content
AI Output Copyright & Attribution Helper
Assess copyright risk and generate attribution for AI-generated content
AI Output Fact Density Analyzer
Measure the ratio of verifiable facts to unverifiable claims in AI text
AI Output Legal Review Checklist
Pre-publication legal review checklist for AI-generated content
AI Output Plagiarism Risk Advisor
Assess plagiarism and IP risk in AI-generated content before use
AI Output Readability Scorer
Score LLM-generated text on Flesch-Kincaid and other readability indices.
Partnership Outreach Prompt Builder
Build AI prompts for partnership intro emails that get meetings
AI Output Source Attributor
Generate proper attribution for AI-assisted research and writing
Performance Review Prompt Builder
Build AI prompts for fair, evidence-based performance reviews
AI Persona / Bot Identity Builder
Design a chatbot persona with name, tone, and knowledge scope
Persona Chat Simulator (BYO Key)
Simulate conversations with any persona or chatbot you define
Personal AI Safety & Privacy Hygiene Guide
Personalized checklist for safe personal use of AI tools
Pitch Deck Prompt Builder
Build AI prompts for every slide in your investor deck
Podcast Episode Planner
Plan podcast episodes with AI prompts for research and scripts
AI Podcast Intro & Jingle Builder
Build music and voice prompts for AI-generated podcast intros and outros
AI Usage Policy Template Builder
Generate an AI acceptable-use policy for your organisation
AI Political Content Disclosure Generator
Generate required disclosures for AI-generated political advertising
Press Release Prompt Builder
Generate a structured AI prompt for any press release type
Pricing Page Copy Prompt Builder
Build AI prompts for pricing pages that convert visitors
AI Privacy by Design Checklist
Embed privacy by design principles into AI system architecture
AI Privacy Impact Score
Quick privacy impact score for evaluating new AI features
AI Procurement Questionnaire Generator
Generate a due-diligence questionnaire for evaluating AI vendors
Procurement Prompt Pack
AI prompts for RFPs, supplier evaluation, and contract briefs
AI Privacy Policy Gap Analyzer
Find AI-related gaps in your existing privacy policy
Product Launch Prompt Pack
AI prompts for every asset in your product launch playbook
Product Manager Prompt Pack
AI prompts for PRDs, roadmaps, user stories, and retros
AI Productivity Score
Self-assess your AI literacy and get a personalised improvement plan
AI Project Charter Builder
Generate a one-page AI initiative charter in under 5 minutes
Project Status Report Prompt Builder
Build AI prompts for crisp weekly project status reports
AI Prompt Formatter
Format messy prompts into clean, structured XML, JSON, or markdown
AI Prompt History Purge Guide
Step-by-step guide to deleting your prompt history from AI services
Prompt Improver (BYO Key)
Paste a weak prompt — get an improved, structured version
AI Prompt Library Manager
Store, tag, search, and share your team's best prompts
AI Prompt Library Sanitizer
Sanitize a batch of prompts to remove PII and secrets
Prompt Security Reference Guide
Learn and test the OWASP LLM Top 10 security risks
Prompt Stress Tester
Test your prompt against 10 adversarial edge cases automatically
AI Prompt Version Tracker
Track prompt iterations and compare outputs side-by-side
Business Proposal Prompt Builder
Turn a brief into a winning proposal with the right AI prompt
Public Sector AI Compliance Checker
Compliance checklist for AI use in government and public services
AI Purpose Limitation Compatibility Checker
Check if a new AI use is compatible with original data collection purpose
QBR Prompt Builder
Build AI prompts for Quarterly Business Review presentations
Readability Improver (BYO Key)
Paste any text — get a plain-English rewrite at your target grade level
Real Estate Agent Prompt Pack
AI prompts for listing copy, buyer emails, and negotiation scripts
AI Recruitment Tool Fairness Checker
Assess fairness risks in AI recruitment tools before procurement
AI Red Team Prompt Generator
Generate adversarial test prompts for AI system safety testing
Regex Generator (BYO Key)
Describe what you want to match — get the regex
AI Red Teaming Report Template
Structured report template for documenting AI red team exercises
AI Regulatory Horizon Scanner
Browse upcoming AI regulations by region and effective date
Research Assistant (BYO Key)
Ask deep research questions — get structured, cited answers
AI Research Ethics Checklist
Ethics checklist for academic research using AI-generated data
Academic Researcher Prompt Pack
AI prompts for literature reviews, abstracts, and paper outlines
AI Response Confidence Estimator
Estimate the likely reliability of an AI response by topic type
Sprint Retrospective Prompt Pack
AI prompts for retro facilitators — What Went Well, deltas, actions
Right to Explanation Response Template
Draft responses to user requests for AI decision explanations
AI Data Rights Request Template
Generate GDPR/CCPA data rights request letters for AI providers
AI Risk Assessment Tool
Identify and rate risks before deploying AI in your workflow
AI System Risk Classifier
Classify your AI system's risk tier under EU AI Act & NIST RMF
Risk Register Prompt Builder
Build AI prompts that identify and rank project risks
Product Roadmap Presentation Prompt Builder
Build AI prompts for compelling roadmap slide narratives
AI ROI Business Case Builder
Build a board-ready AI investment business case in minutes
AI Safety Incident Log Template
Structured incident log template for ongoing AI safety tracking
AI Safety Layer Design Guide
Design a layered content safety system for your LLM application
Scenario Planner (BYO Key)
Generate best-case, worst-case, and expected scenarios with AI
AI in Sensitive Occupations Advisor
Guidance on AI use restrictions for doctors, lawyers & journalists
AI Security Threat Model Generator
Generate a STRIDE threat model for your LLM application
AI Security Awareness Quiz
Test your knowledge of AI-specific security risks in 10 questions
AI Sensitive Topic Classifier
Classify text by sensitive topic categories for content policy
Sentiment & Emotion Analyzer (BYO Key)
Analyse the emotional tone of any text with your LLM
AI Sentiment Manipulation Pattern Checker
Detect emotional manipulation patterns in AI-generated persuasive content
SEO Content Brief Prompt Builder
Build AI prompts that write SEO articles that rank
AI Shadow Use Detection Quiz
Identify unauthorized AI tool use patterns in your organization
AI Social Engineering Awareness Guide
Recognize AI-enhanced phishing, vishing & impersonation attacks
Side-by-Side Model Response Tester (BYO Key)
Send the same prompt to two LLMs and compare outputs instantly
AI Output Sourcing Transparency Checklist
Verify AI-generated research and reports meet sourcing standards
Social Media Manager Prompt Pack
AI prompts for captions, threads, replies, and analytics narratives
Sovereign AI Stack Advisor
Find privacy-respecting, self-hostable alternatives to major AI tools
AI Speed Benchmark Reference
Token-per-second benchmarks for every major LLM API
SQL Query Generator (BYO Key)
Describe your query in plain English — get production SQL
AI Startup Compliance Roadmap Generator
Prioritized compliance roadmap for AI startups by risk and funding stage
AI Supplier Compliance Declaration Generator
Generate a self-declaration of AI Act compliance for your AI product
AI Supply Chain Attack Reference Guide
Reference guide to AI-specific supply chain attack patterns
Supply Chain Prompt Pack
AI prompts for risk assessment, supplier comms, and disruption plans
AI System Bill of Materials Generator
Document your AI system's components like a software SBOM
AI Survey Question Builder
Build AI prompts that generate unbiased survey questions
AI System Card Generator
Generate a Meta-style system card for your AI deployment
Human Oversight Design Advisor for AI Systems
Design meaningful human oversight for your AI system
Teacher Feedback Prompt Pack
AI prompts for personalised student feedback at scale
AI Team Skills Gap Analyzer
Map your team's AI skills and surface the biggest gaps
Technical Documentation Prompt Pack
AI prompts for API docs, README files, runbooks, and changelogs
Technical Specification Prompt Builder
Build AI prompts for complete technical specs from requirements
AI Provider Terms Comparison Tool
Side-by-side privacy term comparisons across top AI providers
AI Terms of Service Decoder
Plain-English summary of key privacy clauses in AI provider ToS
Testimonial Request Prompt Builder
Build AI prompts for testimonial ask emails that get responses
Testing Strategy Prompt Builder
Build AI prompts for QA plans, test cases, and bug reports
AI Output Anonymizer
Redact PII from LLM outputs before you log, share, or store them.
AI Third-Party Risk Matrix
Map and score your AI supply chain for privacy and security risks
Thought Experiment Generator
Generate provocative thought experiments for any business problem
Thought Leadership Calendar Builder
Plan 12 months of expert content with AI prompt-per-piece
AI Time-Saved Tracker
Log which AI tasks saved time — see your cumulative ROI
AI Tone Rewriter (BYO Key)
Rewrite any text in formal, casual, friendly, or persuasive tones
AI Tone & Register Scale Reference
Pick the right tone for any AI writing task — with examples
AI Tool Stack Builder
Design your company's ideal AI tool stack by department
AI Toxic Content Pattern Reference Library
Offline reference of common toxic content patterns for filter design
Training Material Prompt Builder
Generate AI prompts for slides, workbooks, and exercises
AI Training Data Audit Checklist
Audit your AI training dataset for privacy and bias risks
AI Training Opt-Out Guide
Step-by-step instructions to opt out of AI training for 20+ providers
Transcription Model Comparison
Compare Whisper, Deepgram, AssemblyAI, Rev.ai for STT
AI Translation Tool (BYO Key)
Translate any text with tone-preserving LLM quality
AI Transparency Report Template
Generate an AI transparency report skeleton for your product
Upsell & Cross-sell Prompt Builder
Build AI prompts for upsell emails that don't feel pushy
AI Use Case Library
Browse real AI use cases by industry and function
AI User Consent Audit Tool
Audit your consent collection flow for AI data processing
AI Processing Change User Notification Template
Notify users when you change how AI processes their data
AI User Profiling Risk Detector
Assess whether your AI feature creates illegal user profiling
AI & Your Data Rights Explainer
Plain-language explanation of your rights when AI processes your data
AI Vendor Comparison Scorecard
Score AI vendors against your enterprise requirements
UX Designer Prompt Pack
AI prompts for user research, personas, flows, and copy
AI Vendor Data Processing Agreement Checklist
Verify your AI vendor's DPA covers all GDPR requirements
AI Vendor Exit Plan Template
Template for planning migration away from an AI provider
AI Vendor Risk Scorecard
Score an AI vendor's privacy and security posture from their docs
AI Avatar Video Script Formatter
Format scripts for AI avatar tools with pauses and pronunciation guides.
AI Voice Provider Comparison Table
Compare ElevenLabs, PlayHT, OpenAI TTS, Murf, and others at a glance
Voice of Customer Prompt Pack
AI prompts for analysing reviews, NPS comments, and interviews
AI Voice & TTS Model Comparison
Compare ElevenLabs, OpenAI TTS, Google Cloud, AWS Polly
AI Watermark & Detection Explainer
Understand how AI text and image watermarking works
Webinar Outline Prompt Builder
Structure your webinar with a timed outline and AI section prompts
AI Watermark & Artifact Removal Guide
Remove watermarks and compression artifacts from AI images with SD inpainting
AI User Wellbeing Design Checklist
Design AI features that protect user psychological wellbeing
AI Whistleblower Protection Guide
Guidance for safely reporting AI safety or ethics concerns
AI Workflow Planner
Map your business workflow and identify where AI fits
White Paper Outline Prompt Builder
Build a white paper structure and get AI prompts for every section
Workshop Facilitator Prompt Pack
AI prompts for designing and facilitating any type of workshop
AI Writing Style Guide Builder
Create a brand voice prompt you paste into every writing session
Album Art Prompt Builder
Create music album cover prompts matched to genre and era
Ambiguity Resolver Prompt
Add clarifying-question instructions so LLMs ask before assuming
Analogy Generation Prompt Builder
Build prompts that generate illuminating analogies for complex concepts
Anchor Context Prompt Builder
Inject a stable reference anchor into a long conversation prompt
AnimateDiff Prompt Guide
Build AnimateDiff prompts with motion LoRA and prompt travel techniques.
Annual AI Budget Planner
Build a 12-month AI spend forecast with growth and model changes
Anthropic Tool Schema Validator
Validate Anthropic Claude tool definitions before sending them to the API.
Anthropic Messages Array Builder
Build and validate Anthropic API messages arrays visually, then export clean JSON.
Anthropic Usage Stats Parser
Parse input/output/cache token usage from an Anthropic API response.
Anthropic vs OpenAI Pricing Timeline
Historical and current pricing comparison: Anthropic vs OpenAI
API Cost vs ChatGPT Plus Calculator
Is API access cheaper than ChatGPT Plus for your usage?
LLM API Error Decoder
Decode and troubleshoot LLM API error responses in plain English.
API Key Format Validator
Validate the format of OpenAI, Anthropic, and other LLM API keys.
API Key & Secret Scrubber
Detect and mask AWS, OpenAI, GitHub, Stripe & 40+ key formats
API Key Masker for Prompts
Scan prompts and messages for accidentally embedded API keys
API Key Usage Auditor
Review your OpenAI or Anthropic usage stats with your own key
API Response Schema Inferrer
Infer a JSON Schema draft-07 from a sample LLM API response or any JSON object.
API Version Upgrade Cost Impact Calculator
Estimate cost changes when upgrading from GPT-4 to GPT-4o or Claude 2 to 3
LLM API Retry Strategy Calculator
Design an exponential backoff retry strategy for your LLM API calls.
Architecture Prompt Builder
Generate architectural visualization prompts for any building style
Art Style Prompt Library
Browse art styles and movements with copy-ready prompt terms
OpenAI Assistants API Thread Cost Calculator
Calculate the true cost of long-running Assistants API threads
Async vs Sync LLM Call Cost & Latency Comparison
Model cost and latency tradeoffs between synchronous and async LLM calls
At-Scale AI Cost Planner
Model LLM costs for 10K, 100K, 1M daily requests
AI Audio Duration Estimator
Estimate generated audio duration and credit cost from word count
Audio Token Cost Estimator
Estimate cost of audio inputs and outputs with GPT-4o Audio
Audiobook TTS Chapter Formatter
Format book chapters for AI TTS narration with consistent pacing and pauses
AudioLDM 2 Prompt Guide
Generate realistic sound effects and music with AudioLDM 2 prompts
Automatic1111 WebUI Settings Guide
Understand every Automatic1111 setting tab with recommended values
AI Avatar & Lip-Sync Spec Builder
Plan AI avatar videos with script timing, expression, and camera specs
Batch API Cost Estimator
Calculate savings from OpenAI or Anthropic batch API pricing
Batch Image Generation Planner
Plan batch generation jobs to balance quality, speed, and cost
Batch Size Optimizer for Embedding Jobs
Find the optimal embedding batch size for throughput and cost
Batched Prompt Runner (BYO-key)
Run the same prompt over multiple inputs in parallel using your API key.
Best AI for Your Use Case Picker
Answer 5 questions — get your ideal LLM recommendation
Bias Test Case Generator
Generate demographic parity test cases for AI output evaluation
BM25 Relevance Scorer
Score candidate documents against a query using BM25 — no backend needed.
Book Cover Prompt Builder
Build AI image prompts for book covers by genre and market category
BPM & Key Compatibility Checker
Check harmonic compatibility of keys and tempos for AI music generation
Brainstorm Prompt Builder
Build a structured LLM brainstorm with quantity, diversity, and evaluation
Brainstorm Prompt Generator
Get 10 divergent AI brainstorming prompts for any challenge
Camera & Lens Style Picker
Add authentic camera and lens terms to image-gen prompts for realism
Canny Edge Preprocessing Guide
Set Canny low/high thresholds correctly for ControlNet edge detection
Chain-of-Density Summarization Prompt
Build Adams et al. chain-of-density prompts for richer summaries
Chain-of-Thought Token Cost Calculator
Quantify how much chain-of-thought reasoning adds to your bill
Chain-of-Thought Extractor
Extract and isolate reasoning steps from verbose LLM chain-of-thought output.
Chain-of-Thought Scaffold
Wrap any question in a CoT reasoning scaffold automatically
Character Design Prompt Builder
Build game-ready character description prompts for AI image generators
Characters-to-Tokens Converter
Convert character counts to token counts for any LLM
Chat Template Token Overhead Analyzer
Quantify tokens added by model-specific chat formatting
ChatGPT vs Claude Prompt Formatter
Convert a prompt between ChatGPT and Claude best-practice formats
Chunk Overlap Visualizer
See exactly which words land in two chunks for a given sliding-window config.
Text Chunking Previewer
Visualize how your text splits into RAG chunks before indexing.
Chunking Strategy Calculator
Find the optimal chunk size for any LLM and document type
AI Citation Formatter
Format inline LLM citations into APA, MLA, Chicago, or plain footnotes.
Classification Prompt Builder
Build zero-shot or few-shot classification prompts for any label set
Claude Token Counter
Estimate token usage for Anthropic Claude models
Clipdrop / Stability AI API Guide
Use Clipdrop APIs for background removal, relighting, and upscaling
Code Block Extractor
Extract all code fences from an LLM response by language.
Code Secret Scanner
Scan code files for hardcoded secrets before sharing with AI
Code Token Estimator
Estimate tokens in source code files before sending to an LLM
Cohere vs OpenAI Embeddings Cost Comparison
Find the cheapest embedding provider for your corpus size
Color Palette Prompt Builder
Pick a color palette and get prompt-ready color descriptions for image AI
ComfyUI Node Reference Card
Quick reference for core ComfyUI nodes with inputs and outputs
ComfyUI Workflow Planner
Plan ComfyUI node workflows with VRAM and speed estimates
Company AI Use Policy Generator
Generate a tailored internal AI acceptable-use policy in minutes
AI-Generated Image Commercial License Checker
Verify commercial usage rights for images from DALL·E, MJ, SD, and Firefly
Comparative Analysis Prompt Builder
Build structured comparison prompts for fair, comprehensive analysis
Completion Length Predictor
Estimate how many tokens an LLM will generate for your prompt
Composition Rule Prompt Builder
Add rule-of-thirds, golden ratio, and framing terms to your image prompts
Concept Art Prompt Builder
Build professional concept art prompts with vehicle, environment, or creature specs
Concise Instruction Rewriter
Rewrite verbose prompt instructions into tight, precise directives
Consistent Character Prompt Sheet
Generate a character reference prompt sheet for consistent AI illustrations
Constraint Prompt Builder
Add hard and soft constraints to any prompt systematically
Content Calendar AI Planner
Build a 30-day content plan with AI prompts for every post
Context Caching Strategy Planner
Design a prompt caching strategy to maximize cache hit rate and savings
Context Freshness vs Cost Calculator
Find the optimal context update interval to balance cost and freshness
Context Collapse Risk Detector
Find conversation turns that will push you over the context window
Context Length Requirement Model Finder
Find every model that fits your required context window
Context Overflow Cost Calculator
See how much you overpay when prompts exceed the context window
RAG Context Pruner
Drop low-relevance sentences from retrieved context to cut tokens before the LLM call.
Context Relevance Scorer (BYO-key)
Score retrieved context chunks for relevance to your question using an LLM.
Context Utilization Efficiency Score
See how efficiently you're using paid context window tokens
Context Injection vs Fine-Tuning Cost Calculator
Decide whether to inject context or fine-tune based on your volume
Context Window Doubling Cost Calculator
See how changing your context size impacts API cost — it is not a clean 2x.
Context Window Packing Optimizer
Pack multiple short documents into one context window to cut API calls
Context Window Planner
Check if your content fits a model's context window
Context Window Stress Tester
Generate a test prompt that fills exactly N% of a model's context window
Context Window Timeline Viewer
Visualize how context fills up over a long multi-turn conversation
Context Window Size History Timeline
Visualize how LLM context windows grew from GPT-3 to million-token models.
Context Window Visualizer
See how your prompt, context, and output fill a model's context window.
Context Window Size vs Retrieval Quality Tradeoff
Model the cost-quality tradeoff as you retrieve more context chunks.
Contextual Memory Prompt Builder
Build a rolling-context prompt block for multi-turn LLM chats
ControlNet Mode Reference
Quick reference for all ControlNet preprocessors and their ideal use cases
ControlNet Strength Advisor
Calculate optimal control strength and guidance end for ControlNet tasks
Conversation History Compressor (BYO-key)
Compress long chat histories to fit within context windows.
Conversation Cost Tracker
Track cumulative token cost as a multi-turn conversation grows
Conversation Turn Counter & Analyzer
Analyze a chat messages array for turns, tokens, and role balance.
Cosine Similarity Calculator
Compute cosine similarity between two embedding vectors.
Cosine Similarity Threshold Optimizer
Find the optimal cosine similarity cutoff for your retrieval task.
Cost-Aware max_tokens Setter
Find the right max_tokens cap to control cost without hurting quality
Context Refreshing Cost Calculator
Cost of periodically refreshing long-lived AI sessions
Cost of Hallucination Retry Loop Calculator
Quantify the cost overhead of retrying hallucinated LLM responses
Cost-per-1K Tokens Converter
Normalize any LLM price to cost-per-1K tokens for comparison
AI Cost-per-User Calculator
Calculate your LLM cost per monthly active user
Cost Sensitivity Analyzer
See whether shorter prompts or shorter completions cut your LLM bill more.
Cost Spike Alert Simulator
Simulate what triggers your AI spend alert thresholds
Cost-to-Serve per Product Feature Dashboard
Attribute monthly LLM spend to each product feature for unit economics
CoT Step Counter & Planner
Estimate how many reasoning steps your task needs and plan them
Chain-of-Thought Trace Formatter
Reformat verbose CoT reasoning into a clean numbered step trace.
Counterfactual Reasoning Prompt Builder
Build prompts for what-if and counterfactual analysis
Counterfactual Output Evaluator
Check if your LLM output would change with minor input variations
Cover Letter AI Prompt Builder
Generate cover letters with AI — tailored to each job posting
Creative Brief to Image Prompt Converter
Convert a marketing or design brief into a structured AI image prompt
Creative Writing Prompt Generator
Generate rich creative writing prompts from genre, mood, and constraints
Credit Card Number Masker
Find and mask payment card numbers in any text
Cross-Lingual Token Cost Comparison
Compare the extra cost of serving non-English languages with LLMs
CSV → JSONL Converter for LLM Training
Turn a CSV dataset into .jsonl for fine-tuning or evaluation.
CSV / Tabular Data Token Estimator
Estimate tokens when sending CSV or table data in an LLM prompt
Cultural Sensitivity Prompt Checker
Scan prompts for cultural assumptions that may alienate non-Western users
Cultural Visual Style Prompt Library
Add culturally specific visual styles from many traditions to AI prompts
Customer Service Agent Prompt Builder
Build a complete customer service bot system prompt in minutes
AI Customer Support Cost Calculator
Cost per ticket and monthly cost for AI-powered customer support
Customer Support Prompt Pack
AI prompts for tickets, escalations, FAQs, refunds, and satisfaction replies
Daily API Budget Allocator
Set a daily $ budget and see how many requests you can afford
Daily Token Quota Planner
Set per-user token quotas to stay within your daily API budget
DALL-E vs Midjourney vs Stable Diffusion Cost Comparison
Compare image generation costs across providers at scale
DALL·E API Playground
Test DALL·E 3 image generation directly from the browser with your API key
DALL·E Batch Cost Estimator
Estimate total DALL·E 2 and DALL·E 3 API costs for image projects
DALL·E 2 Size Picker
Pick the right DALL·E 2 size (256/512/1024px) with cost comparison
DALL·E 3 Prompt Builder
Write DALL·E 3 prompts that bypass rewrites and hit your creative vision
DALL·E 3 Revision Mode Guide
Use DALL·E 3's natural-language editing with precise instruction patterns
DALL·E 3 Size & Quality Picker
Choose DALL·E 3 size + quality combo and see cost per image
AI Data Controller/Processor Classifier
Determine your GDPR role when using AI APIs with customer data
Data Minimization Prompt Advisor
Identify unnecessary personal data in prompts and suggest minimal versions
Fine-Tuning Dataset Size Estimator
Estimate how many training examples you need for your fine-tuning task.
Debate Prompt Builder
Generate a multi-turn debate prompt between two LLM personas
Decision Tree Prompt Builder
Build a conditional decision-tree prompt for multi-branch LLM behavior
Depth Map ControlNet Guide
Control spatial composition in SD images with depth map preprocessing
Developer Prompt Pack
AI prompts for code review, debugging, docs, tests, and architecture
Directional Stimulus Prompt Builder
Add a hint or nudge to guide LLM output without full specification
Doctor & Clinician Prompt Pack
AI prompts for clinical notes, patient letters, and research summaries
Document Summary Cost Calculator
Cost to summarize 100, 1,000, or 10,000 documents with an LLM
Domain Adaptation Prompt Builder
Adapt a generic prompt for a specific industry vertical
E-commerce Prompt Pack
AI prompts for product descriptions, ads, emails, and support
Educational Tutor Prompt Builder
Build a personalized LLM tutor prompt for any subject and level
ElevenLabs Cost Calculator
Calculate ElevenLabs character credits needed for your audio project
ElevenLabs Voice Settings Advisor
Find ideal stability, similarity, and style settings for ElevenLabs voices
ElevenLabs API Playground
Test ElevenLabs TTS voices from the browser with your own API key
Email Draft Prompt Builder
Build prompts for drafting any type of professional email
Email Subject Line Prompt Builder
Build AI prompts that generate high-open-rate subject lines
Embedding Batch Cost Planner
Plan a batch embedding job — total cost, run time, and optimal batch size under your rate limits.
Embedding Cost Calculator
Estimate token count and API cost for embedding a corpus.
Embedding Dimension Visualizer
Project high-dimensional embedding vectors to 2D with PCA and see semantic clusters.
Embedding Freshness Decay Calculator
Model how document embedding relevance decays over time for time-sensitive RAG.
Embedding Model Comparison Table
Compare text embedding models by dimensions, cost, max tokens, and MTEB score.
Embedding Index Size Calculator
Calculate vector index size in memory and on disk for flat, HNSW, and IVF.
Embedding Model Dimension vs Cost Calculator
Compare cost and storage across embedding dimensions (256, 1536, 3072)
Embedding Nearest Neighbor Finder (BYO-key)
Find the most similar text from a list using real embeddings.
Embedding Storage Cost Calculator
Estimate vector database storage cost for your embedding corpus
Embedding Quantization Estimator
Estimate storage savings vs accuracy impact for embedding quantization.
Textual Inversion Embedding Guide
Use embeddings in SD prompts with correct syntax and placement
Embeddings Cost Calculator
Calculate how much it costs to embed your document corpus
Emotional Tone Prompt Injector
Add precise emotional register instructions to any writing prompt
Enterprise AI Cost Report Generator
Generate a CFO-ready monthly LLM cost breakdown by team, model and use case.
Enterprise Tier ROI Calculator
When does OpenAI or Anthropic enterprise pricing beat pay-as-you-go?
Era & Decade Aesthetic Prompt Builder
Capture any decade's visual aesthetic in AI image prompts
EU AI Act Compliance Checklist
Interactive checklist for EU AI Act obligations by risk tier
LLM Eval Score Aggregator
Aggregate LLM evaluation scores across runs and rubric dimensions with one paste.
LLM Eval Rubric Builder
Design structured evaluation rubrics for LLM output quality.
Evidence-Based Response Prompt Builder
Build prompts that require LLMs to cite and evaluate evidence quality
Expert Panel Prompt Builder
Simulate a multi-expert panel discussion on any topic
Data Extraction Prompt Builder
Build structured extraction prompts for names, dates, entities, and more
AI Face Restoration Settings Guide
Configure GFPGAN, CodeFormer, and RestoreFormer for face enhancement
AI Face Swap Workflow Planning Guide
Plan responsible AI face swap workflows with tool selection and ethical guidelines
fal.ai Model Prompt Builder
Build prompts and parameters for fal.ai hosted Flux and SD models
Feedback Prompt Builder
Build prompts that generate actionable, constructive feedback
Few-Shot Examples Cost Calculator
See how many few-shot examples you can afford per context budget
Few-Shot Example Diversity Checker
Check if your few-shot examples are diverse enough to avoid bias.
Few-Shot Example Quality Rater
Rate your few-shot examples for diversity, clarity, and representativeness
Few-Shot Example Builder
Create and format few-shot examples for your LLM prompt.
Film Look Prompt Builder
Add authentic film stock and cinematic grade aesthetics to image prompts
Financial Data Scrubber
Remove account numbers, IBAN, BIC & routing numbers from text
Fine-Tuning Dataset Generation Cost Estimator
Estimate the cost of generating a synthetic fine-tuning dataset with a teacher model
Fine-Tuning Cost Estimator
Estimate the cost to fine-tune GPT-3.5, GPT-4o, or Gemini
Fine-Tuning vs Prompting Decision Helper
Should you fine-tune or just engineer a better prompt?
Flux vs SD Model Comparator
Choose between Flux.1, SDXL, and SD 1.5 for your image generation goal
Flux Prompt Builder
Build descriptive natural-language prompts for Flux.1 Dev and Schnell
Footnote Extractor & Linker
Extract footnotes from LLM output and hyperlink their references.
Founder Prompt Pack
AI prompts for strategy, fundraising, OKRs, and investor updates
Frame Interpolation FPS Calculator
Calculate output frame count when interpolating AI video from 8fps to 24/60fps
Free Tier Usage Monitor
Track your free-tier usage across OpenAI, Anthropic and Google AI.
Function Call Mock Response Generator
Generate realistic mock tool-call responses from a JSON Schema for testing LLM integrations.
Function Call Response Parser
Parse and pretty-print tool/function call responses from OpenAI or Anthropic.
Function Calling Token Cost Calculator
Account for hidden token overhead from function definitions
GDPR for AI Systems Checklist
GDPR compliance checklist tailored to AI/ML data processing
Gemini Token Estimator
Estimate tokens for Gemini 1.5 Pro, Flash, and Ultra
Geolocation Data Scrubber
Remove precise GPS coordinates and location data from text
Google Gemini vs OpenAI Cost Calculator
Compare Gemini and GPT costs for your exact usage pattern
GPT-4 to GPT-4o Migration Savings Calculator
Quantify your savings from migrating GPT-4 workloads to GPT-4o
GPT-4o mini vs GPT-4o Savings Calculator
Quantify how much you save routing simple tasks to GPT-4o mini
GPT-4o Token Counter
Count tokens in your text exactly as GPT-4o sees them
GPT-4o Vision Prompt Builder
Build optimized prompts for GPT-4o / Claude vision tasks
Groq vs OpenAI: Speed-Cost Tradeoff Calculator
Compare Groq's ultra-fast inference against OpenAI's pricing
Grounding Document Injector
Inject and compress reference documents into a prompt within a token budget
LLM Guard / Moderation Model Cost Calculator
Cost of a moderation call before every main LLM call
Hallucination Review Checklist
Generate a fact-check checklist from any LLM output.
Hallucination Injection Tester (BYO-key)
Test if your LLM correctly handles false premises injected into context.
Hallucination Risk Scorer
Estimate hallucination risk for a given AI task and model type
HeyGen Video Cost Calculator
Calculate HeyGen credit usage for avatar videos by duration and resolution.
Hidden System Prompt Token Cost Estimator
Quantify the invisible ongoing cost of your hidden system prompt
SD Hires.fix Resolution Calculator
Calculate base and upscaled resolutions for the SD hires.fix workflow
HR & People Ops Prompt Pack
AI prompts for hiring, onboarding, performance reviews, and HR policies
HTML → Markdown Converter
Convert HTML responses or pastes to clean markdown.
HyDE Query Generator (BYO-key)
Generate a hypothetical answer document for HyDE-style RAG retrieval with your own key.
Hypothesis Generation Prompt Builder
Build prompts that make LLMs generate structured hypotheses
HyDE Embedding Cost Calculator
Cost of Hypothetical Document Embedding (HyDE) RAG vs standard RAG
Icon & Illustration Prompt Builder
Build icon and UI illustration prompts with consistent style tokens
Ideogram Text-in-Image Prompt Builder
Build Ideogram prompts that reliably render text inside images
Image Generation Cost Calculator
Compare cost per image across DALL·E, Midjourney, Stable Diffusion, Flux
Image Generation Provider Picker
Answer 5 questions and get the best image AI for your specific use case
AI Image Output Format Optimizer
Choose PNG, WebP or JPEG for AI image outputs with quality vs size trade-offs
Prompt Competition Difficulty Analyzer
Assess how crowded your image AI prompt concept is for original output
Image Resolution Comparison Tool
Compare pixel dimensions and megapixels across AI image model outputs
Booru-Style Image Tagging Prompt Builder
Build danbooru/e621-style tag prompts for anime and illustration models
Image-to-Video Motion Prompt Guide
Animate static AI images with video models using motion direction prompts
Google Imagen 3 Prompt Builder
Build Imagen 3 prompts with photorealistic and artistic style guidance
Image Token Cost Estimator
Calculate token and dollar cost of images in multimodal prompts
img2img Denoising Strength Advisor
Pick the right denoising strength for img2img transformations
Indirect Prompt Injection Explainer
Interactive explainer on indirect prompt injection attacks
Inference Cost vs Quality Frontier Explorer
Plot every major LLM on the cost-quality Pareto frontier
Self-Hosted Inference Endpoint Cost Calculator
Calculate the true cost of running your own LLM inference endpoint vs. a hosted API.
AI Image Inference Speed Benchmarks
Compare generation speed across GPUs and cloud providers for SD models
Infographic & Data Visualization Prompt Builder
Generate AI image prompts for infographic and chart visual concepts
Inpainting Mask & Prompt Guide
Write effective inpainting prompts that blend naturally with the original image
Instruction-Following Scorer
Paste an output and score how well the model followed your prompt
Instructor / Pydantic Schema Token Overhead Calculator
Token cost added by Instructor or Pydantic schema injection in prompts
Interview Question Prompt Builder
Generate LLM prompts for creating role-specific interview questions
IP-Adapter Style Reference Guide
Use IP-Adapter for image-prompt style transfer in SD with optimal settings
IP Address Scrubber
Strip IPv4 and IPv6 addresses from logs before AI analysis
Jailbreak Phrase Reference Library
Browse & test documented jailbreak and bypass patterns
Jailbreak Resistance Checker
Harden your system prompt against common jailbreak patterns
Job Description Prompt Builder
Build bias-aware AI prompts that write inclusive job ads
JSON Extractor from LLM Response
Pull JSON objects or arrays out of verbose LLM prose.
JSONPath Extractor for LLM Output
Extract values from nested LLM JSON using JSONPath expressions.
JSON Schema Prompt Builder
Generate the prompt that makes LLMs return valid JSON to your schema
JSON Pointer Extractor
Extract values from LLM JSON output using RFC 6901 JSON Pointers.
JSON Prompt Token Minifier
Minify JSON inside your prompts to cut tokens without losing any data.
LLM JSON Repair
Fix malformed JSON from LLM responses — trailing commas, missing quotes, truncation.
Function-Calling JSON Schema Builder
Build OpenAI/Anthropic tool/function JSON schemas with a visual editor.
JSON Schema → Human-Readable Docs
Generate readable documentation from a JSON Schema for your LLM tools.
JSON Schema → Python Dataclass
Convert a JSON Schema into Python dataclasses with type hints.
JSON Schema → TypeScript Types
Convert a JSON Schema into clean TypeScript interface definitions.
JSON Array → Markdown Table Converter
Convert a JSON array to a formatted markdown table instantly.
.jsonl Dataset Builder
Build and validate .jsonl fine-tuning datasets in the browser.
JSONL → OpenAI Fine-Tuning Converter
Convert your data to OpenAI fine-tuning format with validation.
.jsonl File Validator
Validate every line of a .jsonl dataset against OpenAI or Anthropic schemas.
Kling Video Prompt Builder
Build Kling AI video prompts with motion score and camera control
Knowledge Base Q&A Cost Per Query
Total cost breakdown for one knowledge base Q&A query end-to-end
Knowledge Distillation Cost-ROI Calculator
Calculate ROI of distilling GPT-4o outputs into a smaller model
Knowledge Graph Extractor (BYO-key)
Extract entity-relationship triples from LLM output as a knowledge graph.
Landscape & Environment Prompt Builder
Build cinematic landscape prompts with time of day, weather, and biome
Lambda Labs GPU Cost Calculator
Calculate Lambda Labs on-demand and reserved GPU costs for AI generation
Legal Disclaimer Prompt Injector
Add domain-appropriate legal disclaimers to LLM output prompts
Legal Prompt Pack
AI prompts for contracts, memos, NDAs, and compliance checks
Lighting Style Prompt Library
Browse lighting setups and copy prompt terms for image AI
AI List Deduplicator & Merger
Merge and deduplicate bullet lists from multiple LLM responses.
Live Prompt Cost Meter
Type a prompt and watch the cost meter update in real time
Llama Prompt Formatter
Format prompts correctly for Llama 2, Llama 3, and Mistral chat templates
Llama Token Counter
Count tokens for Llama 2, Llama 3, and Mistral models
LLM API Payload Inspector
Inspect and validate a full LLM API request payload before sending.
LLM Citation URL Validator
Extract and validate URLs cited by an LLM — check format and flag hallucinations.
LLM Conversation Exporter
Export a pasted multi-turn LLM conversation to Markdown, HTML, or print/PDF.
LLM Cost Alerting Threshold Calculator
Set statistically sensible cost alert thresholds based on usage variance
Embeddable LLM Cost Calculator Widget
Generate a cost calculator widget to embed in your app or docs
LLM API Cost Estimator
Estimate monthly LLM API costs from usage volume and model selection.
LLM Cost Forecasting Tool
12-month LLM cost forecast with user growth and price change scenarios
LLM Cost-to-Revenue Ratio Calculator
See what percentage of your SaaS revenue goes to LLM costs
Golden Set Builder for LLM Evals
Curate a golden test set of prompt/expected-output pairs for regression testing.
Jailbreak Prompt Detector
Detect known jailbreak and DAN patterns in prompts before you process them.
LLM JSON Mode Converter
Adapt your prompts for JSON mode and validate the output against your expected schema.
Multi-Output Majority Voter (BYO-key)
Run the same prompt N times and select the majority answer.
Multi-Provider AI Spend Consolidator
Consolidate spend across OpenAI, Anthropic and Google into one view
Action Item Extractor
Extract actionable tasks and next steps from LLM-generated notes or reports.
LLM Output Assertion Checker
Write test assertions against LLM output without running code.
LLM Output Bias Detector
Scan LLM-generated text for common demographic and political bias signals.
Text → Bullets Collapser (BYO-key)
Summarize verbose LLM output into a tight bulleted list with your own API key.
LLM Output Classifier (BYO-key)
Classify LLM responses into custom categories using your API key.
Bullet Expander (BYO-key)
Expand terse LLM bullet points into full sentences or paragraphs with your own API key.
Code Extractor & Syntax Highlighter
Extract code blocks from LLM output with language detection and copy.
LLM Response Comparison Table
Compare responses from multiple LLMs or prompt variants in a table.
Confidence Annotator (BYO-key)
Annotate each sentence in LLM output with a self-assessed confidence estimate.
Factual Consistency Checker (BYO-key)
Check if an LLM summary stays consistent with its source document.
Named Entity Extractor
Extract named entities (persons, orgs, dates, locations) from LLM output.
LLM Output Deduplicator
Remove near-duplicate sentences from verbose LLM output.
Duplicate Sentence Finder
Find near-duplicate sentences in long LLM outputs.
LLM Output Grammar & Style Checker
Catch grammar, style, and consistency issues in LLM-generated text.
Heading Level Normalizer
Normalize inconsistent heading levels in LLM-generated markdown.
Nested JSON Flattener
Flatten deeply nested LLM JSON output into a dot-notation key-value map.
Key Point Extractor
Extract the top N key points from any LLM response automatically.
Instruction Following Checker
Verify that LLM output follows each instruction in your prompt.
LLM JSON Array → CSV Converter
Turn a JSON array from LLM output straight into a clean, downloadable CSV.
Line-by-Line Claim Verifier
Split LLM output by claim and create a verification worksheet.
Number & Statistic Extractor
Extract all numeric claims and statistics from LLM output for fact-checking.
URL & Link Extractor from LLM Output
Extract all URLs from LLM-generated text and check their format.
LLM Markdown Linter
Lint and auto-fix markdown from LLM output before you render it.
Paragraph Reorderer
Reorder paragraphs in a long LLM response to improve structure.
Paraphrase Similarity Checker
Check if two LLM responses say the same thing in different words.
AI Plagiarism Check Prep
Prepare LLM output for plagiarism scanning by cleaning and deduplicating it.
Passive Voice Detector & Rewriter (BYO-key)
Find and optionally rewrite passive voice in LLM-generated text.
Quiz Generator from LLM Output (BYO-key)
Turn any LLM-generated content into comprehension quiz questions with your own API key.
LLM Output Schema Migrator
Map old JSON response shapes to new schemas when your LLM output format changes.
Readability Rewriter (BYO-key)
Rewrite LLM output to a target reading grade level.
Output Schema Guesser
Guess the intended JSON schema from a natural-language output description.
LLM Output Section Navigator
Generate a nested table of contents from a structured LLM response.
Section Extractor by Heading
Extract a specific named section from a long LLM markdown response.
LLM Output Sentiment Analyzer
Score the sentiment and tone of LLM-generated text entirely in your browser.
LLM Output Spell Checker
Catch typos and misspellings introduced by LLM output.
Long LLM Output Splitter
Split long LLM responses into logical, collapsible sections with headings.
LLM Output Summarizer (BYO-key)
Summarize any LLM response to N sentences using your API key.
Markdown Table → JSON Converter
Convert markdown tables from LLM output to structured JSON.
LLM Output Structure Detector
Automatically detect if LLM output is JSON, markdown, code, or plain text.
Date & Time Extractor from LLM Output
Extract and normalize all dates and times mentioned in LLM output.
AI Document TOC Generator
Auto-generate a table of contents from any AI-generated document.
Tone Adjuster (BYO-key)
Rewrite LLM output in a different tone — formal, casual, assertive, empathetic.
LLM Output Toxicity Pattern Scorer
Score AI text for toxic, harmful, or policy-violating patterns
Word Frequency & Diversity Analyzer
Measure vocabulary diversity and word frequency in LLM-generated text.
LLM Price Change Impact Calculator
Model the impact of a provider price change on your monthly bill
LLM Energy Cost Calculator
Estimate the electricity cost and carbon footprint of your LLM usage
LLM Price Drop History Calculator
See how fast LLM prices have fallen and project future costs
LLM Response Formatter
Format raw LLM API JSON responses into clean readable output.
LLM Pricing Calculator
Estimate monthly AI API costs before you commit
Structured LLM Output → HTML Form
Turn a JSON schema or LLM object output into a rendered HTML form.
LLM Subscription vs Pay-Per-Use Optimizer
Should you subscribe to Copilot, Claude.ai, or use the API?
LLM Task Planner Prompt Builder
Build a prompt that makes LLMs plan before acting on complex tasks
LLM Temperature & Parameter Guide
Choose the right temperature, top-p, and tokens for any task
Tool Response Validator
Validate tool/function result JSON before returning it to the LLM.
LLM Translation Validator (BYO-key)
Back-translate LLM-generated text to catch translation drift before you ship it.
LLM Vendor Lock-In Risk Cost Calculator
Quantify the migration cost if your LLM provider raises prices
Logo Concept Prompt Builder
Generate AI logo concept prompts with brand personality and style
Long-Context Model Cost Calculator
Calculate costs for Gemini 1.5 Pro 1M and Claude 200K contexts
Long Context Chunker
Split long documents into context-window-safe chunks with overlap
LoRA vs Full Fine-Tuning Cost Calculator
Compare GPU hours and cost of LoRA, QLoRA and full fine-tuning
Luma Dream Machine Prompt Builder
Build Luma AI video prompts with physics-aware motion descriptions
Song Lyrics Structure Formatter
Format lyrics for Suno with [verse], [chorus], and [bridge] tags
Markdown → HTML Converter
Convert LLM markdown output to clean, semantic HTML.
Markdown → Plain Text Converter
Strip all markdown formatting from LLM output to plain prose.
Markdown Formatting Token Overhead Calculator
See how much markdown formatting inflates your LLM token count and cost.
Marketing Prompt Pack
Ready-to-use AI prompts for every marketing task, with fill-in variables
Medical PII Scrubber (HIPAA-Aware)
Remove the 18 HIPAA identifiers from clinical text before AI use
Meeting Agenda Prompt Builder
Turn meeting goals into a structured AI prompt in seconds
Meeting Notes Summarizer Prompt Builder
Build prompts that turn raw meeting transcripts into structured summaries
Meeting Summary Template Builder
Design a meeting summary template your AI fills in perfectly
Megapixel & Credit Estimator
Convert image resolution to megapixels and estimate compute credits
Meta-Prompt Generator
Generate a prompt that generates prompts — the meta layer
Midjourney Aspect Ratio Calculator
Convert pixel dimensions to Midjourney --ar flags instantly.
Midjourney /blend Mode Guide
Plan image blends with optimal image count, weight, and dimension advice.
Midjourney Chaos Parameter Guide
Understand --chaos 0–100 with use-case suggestions and copy-ready flags.
Midjourney Character Reference (--cref) Guide
Use --cref and --sref for consistent characters and styles in Midjourney
Midjourney /describe Reverse Engineer Guide
Use /describe output to extract reusable style tokens from reference images.
Midjourney --no Parameter Builder
Build --no exclusion lists to remove unwanted elements from MJ images.
Midjourney Pan & Zoom Mode Guide
Use Midjourney's pan and zoom-out features for cinematic expansions
Midjourney Permutation Prompt Builder
Build {option1, option2} permutation prompts to explore variations efficiently.
Midjourney Prompt Builder
Craft detailed Midjourney prompts with style, lighting, and camera controls.
Midjourney --quality (--q) Parameter Guide
Choose the right --quality value for your Midjourney image and save credits
Midjourney --style raw Guide
Use Midjourney --style raw for minimal MJ aesthetic with maximum prompt control
Midjourney Seed Manager
Save, label, and reuse Midjourney seed numbers for consistent results.
Midjourney Stylize Explorer
Preview how --stylize values (0–1000) affect your prompt output.
Midjourney Tile Mode Guide
Generate seamless pattern prompts optimized for the --tile flag.
Midjourney Prompt Optimizer
Trim redundant tokens and reorder Midjourney prompts for max impact
Midjourney Version Comparator
Side-by-side capability matrix for Midjourney v4 through v7.
Model Bias Review Checklist
Structured checklist for reviewing AI model bias before deployment
Image AI Model Capability Comparator
Compare 15+ image AI models across quality, speed, cost, and licensing
Model-Specific Prompt Formatter
Reformat one prompt for GPT-4, Claude, Gemini, and Llama simultaneously
Model Context Length Reference Table
Quick lookup for context windows, costs, and modalities across all major LLMs.
LLM Latency Estimator
Estimate time-to-first-token and total latency for your LLM call.
SD Model Merge Recipe Builder
Design model merge recipes with weighted coefficients and merge methods
LLM Model Pricing Calculator
Side-by-side cost comparison across OpenAI, Anthropic, Gemini, and Mistral.
Model Pricing Comparison Table
Compare input/output prices across 30+ LLMs in one table
Model Routing Cost Optimizer
Design a multi-model routing strategy to minimize API spend
Model Tier Recommender by Budget
Get the best LLM for your task given a strict cost-per-call budget
Monthly AI Spend Estimator
Forecast your monthly LLM bill from daily usage patterns
Motion Graphics Concept Prompt Builder
Build motion graphics storyboard prompts for AI video generation
Multi-Agent Coordination Prompt Builder
Build system prompts for orchestrator and worker agents in a multi-agent setup
Multi-Agent Pipeline Cost Estimator
Estimate total cost of an AutoGen or LangGraph multi-agent workflow
Multi-Hop Question Prompt Builder
Build prompts for multi-hop reasoning across multiple documents
Multi-Query RAG Query Expander (BYO-key)
Generate multiple retrieval queries from one user question for better recall.
Multilingual Prompt Builder
Build prompts optimized for non-English language tasks
Multilingual Token Estimator
Compare tokenization efficiency across 30+ languages
AI Music Genre Tag Library
Browse music genre and subgenre tags with Suno/Udio prompt formatting
AI Music Instrumentation Tag Guide
Add precise instrumentation tags to Suno and Udio music generation prompts
Music Mood to Prompt Descriptor Translator
Translate emotional descriptions into AI music prompt vocabulary
Music Loop & Stem Prompt Builder
Generate loopable AI music and individual stem prompts for production use
AI Music Production Style Guide
Add production-quality descriptors (mastered, lo-fi, warm vinyl) to music prompts
MusicGen Prompt Guide
Write optimized prompts for Meta's MusicGen audio generation model
NovelAI Diffusion Prompt Guide
Master NAI Diffusion V3 prompting with tag weight and quality booster syntax
Negative Prompt Library for Image Models
Build and manage reusable negative prompts for image generation
Negative Prompt Optimizer
Remove redundant negative prompt tokens and improve SD generation quality
Negative Space Prompt Builder
Articulate what the model should NOT do, clearly and completely
Newsletter Prompt Pack
AI prompts for intros, sections, CTAs, and subject lines
NLP De-identification Tester
Test whether your de-identified text can be re-identified
o1 Reasoning Token Cost Calculator
Estimate true cost of OpenAI o1 including hidden reasoning tokens
Open-Source Model Hosting Cost Calculator
True cost to self-host Llama 3 70B on AWS, GCP, or Azure
Open-Source vs API Cost Comparison
When does self-hosting Llama 3 beat paying for GPT-4o?
OpenAI Usage Stats Parser
Extract and cost-estimate token usage from an OpenAI API response.
OpenAI Chat Messages Builder
Build and validate OpenAI chat completion messages arrays visually.
OpenAI Function Schema Validator
Validate your function/tool schema against the OpenAI spec before you call.
OpenAI Usage Tier Upgrade Calculator
Find out when your spending qualifies you for the next OpenAI usage tier
OpenAI TTS Cost Calculator
Calculate OpenAI TTS API cost by word count and voice model
OpenAI TTS API Playground
Test OpenAI text-to-speech voices in the browser with your API key
OpenAI TTS Voice Picker
Compare OpenAI TTS voices (alloy, echo, fable, nova, onyx, shimmer) by use case
OpenAI vs Anthropic Cost Comparison
Side-by-side cost comparison for equivalent OpenAI and Anthropic models
OpenAPI → LLM Tool Schema Converter
Turn OpenAPI endpoints into OpenAI or Anthropic tool definitions.
OpenPose ControlNet Guide
Use OpenPose maps to control human pose in SD image generation
Outpainting Extension Prompt Guide
Extend AI images seamlessly with optimized outpainting prompt strategies
Critique-and-Revise Loop Prompt Builder
Build prompts that make the LLM critique its own output, then revise it
Output Format Injector
Append the right output-format instruction to any prompt
Output Parser Code Generator
Generate JavaScript or Python to parse your LLM's expected output format
Output Post-Processing Pipeline Builder
Chain multiple post-processing steps on LLM output in a configurable order.
Output Token Estimator
Estimate likely output tokens from a prompt before sending, to forecast cost.
Parallel Requests Cost & Rate Limit Planner
Plan parallel LLM calls to maximize throughput within budget
Parallel Tool Calling Cost Calculator
Cost of parallel vs sequential tool calls in GPT-4o and Claude
Password Hash & Token Scrubber
Detect and redact bcrypt, SHA, JWT & other hash formats from text
PDF-to-Tokens Estimator
Estimate tokens and cost before sending a PDF to an LLM
Per-Feature AI Cost Allocator
Attribute LLM costs to individual product features for P&L tracking.
Persona Alignment Scorer
Score how well a model response aligns with a defined persona
Persona Consistency Checker
Check if a model's output is consistent with its assigned persona
Persona Switcher
Rewrite your system prompt to embody any persona style
PhotoMaker & InstantID Guide
Configure PhotoMaker and InstantID for identity-consistent AI portraits
PII Redactor for AI Prompts
Scrub names, emails, phones & addresses before pasting into any AI
Pika Video Prompt Builder
Build Pika 1.5 prompts with motion, aspect ratio, and consistency tips
Podcast Script TTS Optimizer
Format scripts for AI voice with natural pauses and pronunciation hints
Pony Diffusion XL Prompt Guide
Master Pony Diffusion XL scoring and tag prompting for best output
Portrait Photography Prompt Builder
Build detailed portrait prompts with age, ethnicity, expression, and style
Prompt Prefill Token Cost Calculator
Calculate cost savings from Anthropic-style assistant response prefilling
Price-per-Quality-Point Calculator
Normalize LLM cost by benchmark performance to find best value
AI Image Print Resolution Calculator
Check if an AI-generated image has enough resolution for print at your size
Privacy-Safe Prompt Rewriter
Rewrite your prompt to remove identifiable details automatically
Product Description Prompt Builder
Build prompts for generating high-converting product descriptions
Product Photography Prompt Builder
Create studio product shot prompts for e-commerce and marketing AI images
Prompt A/B Comparator (BYO-key)
Send two prompt variants to the same model and diff the outputs
Prompt Anonymizer
Replace real entities in prompts with realistic synthetic equivalents
Prompt Benchmark Builder
Create a reusable evaluation benchmark for a specific prompt task
Prompt Caching Analyzer
Identify which parts of your prompt are eligible for Anthropic prompt caching.
Prompt Caching Savings Calculator
See how much you save with Anthropic or OpenAI prompt caching
Prompt Chain Designer
Design and visualize multi-step prompt chains as connected steps
Prompt Character & Token Counter
Count characters, words, sentences, and tokens for any prompt — live as you type.
Prompt Chaining Workflow Planner
Plan multi-step AI image workflows generate, upscale, inpaint, export
Prompt Clarity Scorer
Score your prompt on clarity, specificity, and output definition
Prompt Complexity Grader
Grade the cognitive complexity your prompt demands of the LLM
Prompt Compression Ratio Calculator
See how much you can compress a prompt without degrading it
Prompt Compression Estimator
Estimate how much your context can be compressed to save tokens.
Prompt Compression ROI Calculator
Quantify how much compressing your prompt saves per month
Prompt Confidence Calibrator
Add calibrated uncertainty instructions to any factual prompt
Context Window Budget Planner
Allocate your context window tokens across system, history, and query
Prompt Contrast Highlighter
Highlight the key differentiating phrases in two competing prompts
Prompt Cost Calculator
See exactly what one API call costs across all major models
Prompt Coverage Matrix Builder
Map your prompt against edge cases to find coverage gaps
Prompt Escape Hatch Detector
Find loopholes in your prompt that an LLM could exploit to deviate
Academic Abstract Prompt Builder
Build prompts for writing structured academic paper abstracts
API Documentation Prompt Builder
Build prompts for generating clear API endpoint documentation
Case Study Prompt Builder
Build prompts for writing compelling customer case studies
Changelog Writing Prompt Builder
Build prompts that turn git commits into clear changelogs for users
Code Generation Prompt Wizard
Build optimized prompts for generating code in any language
Code Review Prompt Builder
Build prompts that produce structured, actionable code reviews
Cold Email Prompt Builder
Build prompts for writing personalized, high-converting cold emails
Competitor Analysis Prompt Builder
Build prompts for structured LLM-powered competitor research
Data Analysis Prompt Builder
Build prompts for LLM-powered analysis of tabular data and CSVs
Debugging Prompt Builder
Build prompts that get LLMs to actually fix bugs, not just describe them
Executive Summary Prompt Builder
Build prompts for concise, action-oriented executive summaries
FAQ Generation Prompt Builder
Build prompts that generate comprehensive FAQs from any document
Grant Writing Prompt Builder
Build prompts for writing compelling grant applications in any field
Image Generation Prompt Builder
Build optimized text prompts for DALL·E, Midjourney, and Stable Diffusion
Incident Postmortem Prompt Builder
Build prompts for generating blameless postmortem reports
Lesson Plan Prompt Builder
Build prompts that generate structured lesson plans for any topic
Legal Contract Prompt Builder
Build prompts for generating standard contract clauses and terms
Narrative Arc Prompt Builder
Build story prompts with a full three-act or hero's journey structure
Newsletter Writing Prompt Builder
Build prompts for engaging newsletter issues in any niche
Policy Writing Prompt Builder
Build prompts for generating structured organizational policies
Press Release Prompt Builder
Build prompts for generating AP-style press releases from bullet points
Performance Review Prompt Builder
Build prompts for generating structured employee performance reviews
Regex Generation Prompt Builder
Build prompts that reliably generate and explain regular expressions
Risk Analysis Prompt Builder
Build prompts for structured risk identification and assessment
Sentiment Analysis Prompt Builder
Build LLM prompts for nuanced multi-dimensional sentiment analysis
SOP Writing Prompt Builder
Build prompts for generating clear Standard Operating Procedures
SEO Content Prompt Builder
Build prompts that generate SEO-optimized content for any keyword
SQL Generation Prompt Builder
Build prompts that generate accurate SQL from natural language
System Design Prompt Builder
Build prompts for LLM-assisted software system design exercises
Test Generation Prompt Builder
Build prompts that generate comprehensive test suites from source code
User Story Prompt Builder
Build prompts for generating Agile user stories with acceptance criteria
Whitepaper Prompt Builder
Build prompts for writing authoritative technical whitepapers
Prompt Grounding Verifier
Verify that a model's answer stays within your provided context
Hallucination Guard Prompt Builder
Add anti-hallucination instructions to any factual or grounded prompt
Prompt Injection Test Suite
Run 50 injection test strings against your chatbot endpoint
Prompt Injection Test Suite
Generate prompt injection and jailbreak strings to test your LLM app's defenses.
Prompt Injection Defense Token Cost Calculator
Weigh the token cost of safety prefixes against injection risk
Prompt Version Differ
Word-level diff between two prompt versions to see exactly what changed.
Prompt Injection Detector
Scan user input for prompt injection patterns before you send it to your LLM.
Prompt Instruction Conflict Checker
Find contradictory instructions in your prompt automatically
Prompt Iteration Tracker
Track prompt iterations and parameter changes with notes and ratings
System Prompt Leak Detector
Check if an LLM response appears to contain a leaked system prompt
Prompt Token Length Analyzer
Check if your SD prompt exceeds the 75-token CLIP limit
Prompt Length Optimizer
Find the shortest prompt that preserves the full original intent
Prompt Library Browser
Browse curated prompts by model, task, and category
Prompt Meta-Evaluator
Score your prompt against 10 best-practice dimensions before sending.
Prompt Localization Adapter
Adapt a prompt for cultural and linguistic context in 30+ locales
Prompt Mutation Tester
Auto-generate prompt mutations and run them to find the best
Narrative Consistency Checker
Check a multi-chapter story for contradictions in character and plot details
Prompt Optimizer & Critiquer
Send your prompt to an LLM and get a structured critique + rewrite
Prompt PII Scrubber
Remove personal information from prompts before sending to any LLM
Prompt Instruction Priority Ranker
Order competing instructions in your prompt by importance to the model
Prompt Reading Level Checker
Estimate the reading level and clarity of your prompt text
Prompt Redundancy Remover
Find and merge duplicate instructions in long system prompts
Prompt ROI Calculator
Calculate how many hours AI saves your team per month and what it's worth
Prompt Safety Classifier
Classify your prompt by safety risk category before sending
Prompt Safety & Content Policy Checker
Check image prompts against DALL·E, Midjourney and Stability AI policies
Prompt Sensitivity Analyzer
Identify which words in your prompt most affect the output
Prompt Semantic Similarity Checker
Check how semantically similar two prompts are using TF-IDF
Prompt Specificity Amplifier
Replace vague words in your prompt with precise, actionable alternatives
Style Transfer Prompt Guide
Transfer any visual style to your AI image prompt using reference techniques
Prompt Style Transfer Builder
Build a prompt that rewrites any text in a specific author's style
Prompt Template Cost Optimizer
Compare prompt template variants by token cost and completeness
Prompt Template Library Editor
Create, organize, and export your personal prompt template library
AI Image Prompt Template Library
Proven prompt templates for portraits, landscapes, products, and more
Prompt Testing Harness
Run one prompt against multiple test inputs and grade outputs
Prompt-to-Completion Cost Ratio Analyzer
Understand your input vs output token cost split
Prompt to Markdown Formatter
Structure your prompt with clean Markdown headings and bullets
Prompt to XML Formatter
Convert plain prompts to Claude-style XML-tagged prompt structure
Prompt Token Budget Planner
Allocate tokens across system, context, and output within your context window.
Prompt Token Counter
Count tokens for GPT-4, Claude, Gemini before you send
Prompt Token Trimmer
Shorten a prompt to a target token budget without losing meaning
Prompt Variable Injector
Fill prompt templates with variables and preview the final text.
Prompt Variation Generator
Generate 10 creative variations of your base image AI prompt
Prompt Version Diff
Diff two versions of a prompt to see exactly what changed
Prompt Variable Manager
Define {{variables}} in your prompt and fill them with a form
Prompt Variable Scope Checker
Verify all {{variables}} in a template are defined and used consistently
SD Prompt Attention Weight Calculator
Calculate compounding attention weights for nested SD parentheses
AI Provider Data Retention Reference
Look up how long OpenAI, Google, Anthropic & others keep your data
Provider Redundancy Cost Planner
Cost of multi-provider redundancy vs single-provider risk
Pydantic Model from JSON
Generate a Python Pydantic v2 model from any JSON sample.
RAG Architecture Planner
Plan your Retrieval-Augmented Generation stack interactively
RAG Chunk Size & Overlap Calculator
Find the optimal chunk size and overlap for your RAG pipeline.
RAG Context Budget Calculator
Plan how many document chunks fit in your RAG context window
RAG Context Window Optimizer
Maximize relevant context in your prompt while staying within token limits.
RAG Document Metadata Tagger (BYO-key)
Auto-generate metadata tags for documents before indexing into a vector store.
RAG Eval Dataset Builder
Build question / context / answer triples for evaluating your RAG pipeline.
Parent-Child Chunker Preview
Preview parent-document + child-chunk splitting for hierarchical RAG.
Hybrid Search Weight Tuner
Find the optimal alpha between BM25 and dense retrieval for hybrid RAG.
RAG Pipeline Designer
Design your retrieval-augmented generation pipeline and export a diagram.
RAG Query Analyzer
Analyze your user queries to predict RAG retrieval difficulty and type.
RAG Query Rewriter
Rewrite user questions into better vector search queries
RAG vs Fine-Tuning Cost Breakeven
Find the call volume where fine-tuning beats RAG on cost
RAGAS Score Calculator
Calculate RAGAS faithfulness, answer relevance, and context precision scores.
LLM Rate Limit Calculator
Calculate safe request rates given your LLM API tier limits.
Rate Limit Burst Capacity Planner
Plan request queuing to absorb traffic bursts within your TPM limit
Rate Limit & Throughput Planner
Plan concurrency to stay within TPM and RPM limits
ReAct Agent Cost-per-Task Calculator
Estimate what a tool-using ReAct agent costs to complete one task.
ReAct Framework Prompt Builder
Build a Reason+Act (ReAct) prompt for tool-using LLM agents
Real Estate Prompt Pack
AI prompts for listings, valuations, client comms, and reports
Reasoning Trace Extractor Prompt
Generate a prompt that forces the model to expose its reasoning
Recursive Summarizer (BYO-key)
Summarize documents too long for context via recursive chunk summarization.
Regex from Description (BYO-key)
Describe what you want to match; get a tested regex back.
Regional Prompter Composition Guide
Assign different prompts to spatial regions of your SD image
Replicate Model Cost Estimator
Estimate Replicate run costs for popular image and video models
Reranker Score Comparator
Compare retrieval scores before and after reranking to visualize improvement.
Resume AI Prompt Builder
Turn your experience into a prompt that writes your ideal resume
Resume Tailoring Prompt Builder
Build prompts that tailor a resume to a specific job description
Retrieval Context Formatter
Format RAG-retrieved chunks into a clean context block for your prompt.
RAG vs Long-Context: Cost & Latency Tradeoff
Should you use a 1M-token long-context model or build a RAG pipeline?
Retrieval Precision & Recall Calculator
Evaluate your RAG retrieval quality with precision, recall, and F1.
RAG Prompt Template Builder
Generate the retrieval-augmented prompt wrapper for any search result
Audience Rewrite Prompt Builder
Generate a prompt that rewrites content for any target audience
Role & Persona Prompt Generator
Generate expert-role framing prompts for any domain in seconds
Runway Gen-3 Prompt Builder
Craft Runway Gen-3 Alpha video prompts with motion and cinematography terms
RunPod GPU Cost Calculator
Estimate RunPod Secure Cloud and Community Cloud costs for AI image/video
Runway Motion Brush Guide
Plan Runway Gen-3 motion brush strokes for controlled video animation
Safety System Prompt Builder
Build comprehensive safety and refusal instructions for any LLM app
Sales Prompt Pack
AI prompts for cold outreach, follow-ups, discovery, and objection handling
School AI Use Policy Generator
Draft a student-facing AI integrity policy for any school level
SD CFG Scale Advisor
Find the ideal guidance scale for your SD model and prompt style
LoRA Style Mixer
Mix multiple LoRA weights and preview the <lora:name:strength> syntax
SD Negative Prompt Library
Browse and copy proven negative prompt presets for Stable Diffusion
SD Sampler Selector Guide
Pick the right Euler/DPM/DDIM sampler for your image type and speed
SD Prompt Debugger
Diagnose why your SD prompt produces unexpected results
SD Step Count Optimizer
Find the minimum steps for good quality per sampler and model
SD Token Weight Syntax Builder
Build (token:weight) and [token] syntax for SD prompts without typos
SDXL Extension & Fine-tune Model Guide
Navigate the SDXL model ecosystem: base, refiner, fine-tunes, and adapters
Stable Diffusion 3 Prompt Guide
Write SD3 prompts in natural language with MMDiT-optimized structure
SDXL Native Resolution Picker
Choose SDXL-optimized resolutions to avoid quality degradation
Stable Diffusion Prompt Builder
Compose SD prompts with weighted tokens, artists, and quality boosters
SDXL Turbo & Lightning Guide
Configure SDXL Turbo and Lightning models for 1–4 step generation
Security Log PII Scrubber
Scrub PII from security logs before sharing with AI analysis tools
Self-Ask Reasoning Prompt Builder
Build self-ask decomposition prompts for complex question answering
Seed & Determinism Helper
Configure seeds, temperature=0 and system prompts for reproducible LLM output.
Self-Consistency Prompt Builder
Generate a prompt that runs multiple reasoning paths and votes on the answer
Semantic Cache Savings Estimator
Estimate how much semantic caching of similar queries cuts your LLM bill.
Semantic Search Cost Estimator
Total cost of one semantic search: embed query + retrieve + generate
Semantic Similarity Matrix (BYO-key)
Generate an N×N similarity heatmap for a set of texts using embeddings.
Sensitive Field Detector
Identify sensitive data fields in JSON/CSV before sending to AI APIs
Sentence-Boundary Splitter
Split text into clean sentences for RAG indexing or evaluation.
Similarity Score Ranker
Score and rank candidate texts against a query by real embedding cosine similarity.
AI Image Social Media Size Guide
Generate AI images at the exact pixel dimensions for each social platform
Social Post Prompt Builder
Craft AI prompts for LinkedIn, X, Instagram, and TikTok captions
Social Proof Prompt Builder
Build prompts that generate testimonials and social proof copy
Socratic Dialogue Evaluator
Score a multi-turn LLM dialogue for reasoning quality and consistency
Socratic Irony Detector Prompt
Build a prompt to detect sarcasm, irony, and dry humor in text
Socratic Questioning Prompt Builder
Turn any topic into a Socratic dialogue prompt series
Yes-And Improv Prompt Builder
Build prompts that use improv 'yes-and' for generative brainstorming
SOP Prompt Builder
Generate Standard Operating Procedures with AI — prompt included
Sora Video Prompt Builder
Build cinematic Sora video prompts with motion, camera, and scene descriptions
Sound Design Effect Prompt Builder
Generate AI sound effect prompts for games, film, and podcasts
Spatial Audio Prompt Builder
Build prompts for AI audio with positional and environmental sound descriptors
Special Token Decoder
Identify and explain special tokens in prompts and chat templates
SSN / National ID Scrubber
Detect and mask US SSNs, UK NINOs & 15 other national ID formats
Stability AI API Credit Calculator
Calculate Stability AI API credits needed for your image generation workflow
Stable Audio Prompt Guide
Write effective Stable Audio prompts for music and sound effects
Stable Cascade Configuration Guide
Optimize Stable Cascade stage A/B settings for quality and speed
Stability AI API Playground
Test Stability AI image generation endpoints from the browser with your key
SDXL Base + Refiner Workflow Guide
Configure SDXL base and refiner split for optimal quality
Stable Video Diffusion Guide
Configure SVD settings for optimal motion and consistency.
Step-Back Prompting Builder
Generate step-back prompts that improve abstract reasoning
Stop Sequence Tester
Test where your configured stop sequences would truncate LLM output.
Streaming Chunk Reassembler
Reassemble SSE/streaming LLM chunks into a clean full response.
First-Token Latency vs Cost Optimizer
Choose a model that balances time-to-first-token and cost
Streaming vs Batch Mode Cost Comparison
Does streaming affect your LLM bill? Find out here.
Structured Output Enforcer
Generate retry-on-parse-failure prompts that guarantee structured output
Structured Extraction Schema Token Cost
Compare token cost of simple vs complex JSON extraction schemas at scale
Structured Output Schema Tester
Test OpenAI structured output JSON schemas against sample responses.
Structured Output Token Overhead Calculator
See how JSON mode or structured outputs inflate token costs
Student Prompt Pack
AI prompts for essays, study plans, research, and revision
Style Consistency Token Manager
Save and reuse style tokens to keep visual consistency across image sets
Style Guide Prompt Injector
Convert a writing style guide into an injectable prompt block
Summarization Pipeline Cost Planner
Cost out a map-reduce summarization pipeline for long documents
Summarization Prompt Builder
Generate a best-practice summarization prompt for any content type
Suno Music Prompt Builder
Write Suno AI music prompts with genre, mood, tempo, and instrumentation
Synthesia vs HeyGen vs D-ID Comparator
Choose the best AI avatar platform for your use case and budget.
Synthetic PII Data Generator
Generate realistic but fake PII datasets for AI testing
System Message Splitter
Split a long system prompt into optimally ordered sub-blocks
System Prompt Builder
Visually compose robust system prompts with structured sections
System Prompt Library
Battle-tested system prompts for every role and use case
System Prompt Length Optimizer
Score your system prompt for verbosity and suggest cuts to save tokens.
System Prompt Linter
Check your system prompt for common quality issues and anti-patterns
System Prompt Security Scanner
Scan system prompts for security anti-patterns and data leakage risks.
System Prompt A/B Tester (BYO-key)
Compare two system prompts side-by-side using your own OpenAI or Anthropic key.
System Prompt Size vs Model Quality Tradeoff
Find the minimum effective system prompt size for your use case
System Prompt Token Auditor
Find token waste in your system prompt and get a slim version
Table Output Prompt Formatter
Generate prompts that produce clean Markdown or HTML tables
Markdown Table Extractor
Pull markdown tables from LLM output and convert to CSV or JSON.
Task Decomposition Prompt Builder
Break complex tasks into a chain of sub-prompts automatically
Teacher Prompt Pack
AI prompts for lesson plans, rubrics, feedback, and assessments
Temperature & Retries Cost Impact Calculator
See how retries and high temperature inflate your token bill
Temperature Effect Visualizer
Send the same prompt at multiple temperatures and compare outputs
Temperature & Top-p Explainer
Understand and pick the right temperature and top-p for your LLM task.
Texture & Pattern Prompt Builder
Build prompts for seamless textures, materials, and surface patterns
Tiktoken Browser Tool
Tokenize text in your browser with GPT-style cl100k / o200k logic
Tiled Diffusion Settings Guide
Generate high-resolution images with Tiled Diffusion without VRAM overflow
Together AI Cost Calculator
Calculate Together AI inference costs for open-source models
Token-Based SLA Planner
Set token quotas per user tier to enforce cost SLAs
Token Budget Splitter
Allocate a fixed token budget across prompt, context, and reply
Token Budget Negotiator for Claude
Set an optimal token_budget parameter for Claude extended thinking
Token Burn Rate Dashboard
Enter daily usage and see your token burn rate and spend forecast
Prompt A/B Test Cost Calculator
Plan a statistically significant prompt A/B test within a budget
Token Cost Estimator
Paste any text — see the cost across all major LLMs instantly
Token Cost by Language Model Matrix
Full cost matrix: every major model × your token volumes
Code Generation Cost Estimator
Estimate LLM cost to generate, review, or refactor a codebase
LLM Evaluation Run Cost Estimator
Budget the token cost of running an LLM evaluation benchmark
Data Extraction Pipeline Cost Estimator
Estimate the cost to extract structured data from N documents with an LLM.
Legal Document Token Cost Estimator
Estimate cost of running legal documents through an LLM for analysis
Personalization Context Token Cost Calculator
Cost of injecting user history and preferences into every LLM call
Token Cost Heatmap by Model
Color heatmap of 30+ LLMs from cheapest to priciest for your token ratio.
Token Cost per Output Unit Calculator
Convert LLM API costs into cost-per-blog-post, cost-per-email, etc.
Token Count API Tester
Live token count via your own API key — exact, not estimated
Token Count Diff Tool
Compare token counts between two prompt versions
GitHub Repo Token Estimator
Estimate token count of a GitHub repo before feeding it to an LLM
Token Count Estimator (No-Key, All Models)
Estimate token counts across GPT, Claude, Gemini and Llama with no API key.
Token Counter (Multi-model)
Estimate tokens for GPT-4, Claude, Llama and Mistral — entirely client-side.
Token Counting Formula Reference Sheet
Quick-reference guide to token counting rules for all major models
Token Counting Unit Test Generator
Generate unit tests to assert correct token counts in your codebase
Token Density by Content Type Calculator
Compare tokens per word across prose, code, JSON, HTML and more
Token-Efficient Prompt Scorer
Score your prompt on token efficiency vs information density
Token Frequency Analyzer
Analyze token frequency and vocabulary diversity in LLM output.
Token-Inflation Language Checker
Detect wordy phrases in prompts that inflate tokens without adding value.
Tokens-per-Dollar Leaderboard
Which LLM gives you the most tokens for $1?
Token Price Normalization Tool
Normalize per-token prices by quality score for a fair model comparison
Token Trimmer
Trim text to a target token count while preserving sentence boundaries.
Token Savings Leaderboard
See which prompt engineering techniques save the most tokens
Token Visualizer
See exactly how your text is split into tokens with color highlights
Token Waste Analyzer
Find the biggest sources of wasted tokens in your prompts and where to compress.
Multi-Model Tokenizer Playground
Tokenize the same text with GPT, Claude, and Llama side by side
Tokens-per-Second Speed vs Cost Calculator
Rank models by tokens/second per dollar for throughput-sensitive tasks
Tone Rewriter Prompt Generator
Build a prompt that rewrites any text to a specified tone
Tool Calling Token Overhead Calculator
Quantify hidden token costs from tool definitions and results
Tool Schema Test Harness (BYO-key)
Test your LLM tool/function schema end-to-end with real API calls.
Tool-Use Function Calling Prompt Builder
Build OpenAI/Anthropic function-calling prompts with tool schemas
Tool Use Trace Visualizer
Visualize multi-step LLM tool-use traces as a clear step-by-step flow.
Top-K Retrieval Simulator
Simulate top-k retrieval and see recall, precision, and MRR for k = 1, 3, 5, 10.
Translation Prompt Builder
Build precise LLM translation prompts with cultural and domain context
Translation Token Multiplier Calculator
Estimate token expansion when translating between languages
Tree-of-Thought Prompt Builder
Generate a Tree-of-Thought reasoning prompt for complex problems
TTS Emotion & Tone Prompt Guide
Use natural language emotion directions to get expressive AI voice outputs
TTS Reading Speed Calculator
Estimate audio duration from word count and speech rate
TTS SSML Markup Builder
Build SSML tags for pauses, emphasis, and prosody in AI voice generation
Udio Music Prompt Builder
Craft Udio prompts with style tags, era, and production quality descriptors
UI Mockup Prompt Builder
Generate UI/UX mockup image prompts for app and web design concepts
AI Upscaling Size Calculator
Calculate output dimensions for 2× / 4× / 8× AI upscaling
SD VAE Selection Guide
Choose the right VAE for sharp colors, skin tones, or anime style in SD
Seed Variation Strategy Guide
Use seeds and variation strength to explore controlled creative variations
Vast.ai GPU Cost Estimator
Compare Vast.ai instance costs for running SD, Flux, or video models
Vector Arithmetic Playground
Perform add, subtract, and interpolate operations on embedding vectors.
Vector Database Cost Comparison
Compare hosting costs across Pinecone, Weaviate, Qdrant, and pgvector.
Vector Dimensionality Cost Calculator
Calculate storage size and monthly cost of your embedding index by dimensions.
Vector Distance Suite
Compare embedding vectors with cosine, dot, Euclidean, and Manhattan distance.
Video Duration × Quality Credit Planner
Plan video generation batches to stay within your credit budget
Video Generation Credit & Cost Calculator
Compare Sora, Runway, Pika, and Kling costs per video by length and quality
Video Generation Provider Picker
Choose between Sora, Runway, Pika, Kling, and Luma for your video project
Video Resolution & Bitrate Calculator
Calculate file size and bandwidth for AI video outputs at any resolution
Video Generation Negative Prompt Guide
Avoid flickering, morphing, and watermarks with video AI negative prompts
Video Storyboard Prompt Sequencer
Plan multi-shot AI video sequences with consistent scene and character prompts
AI Video Upscaling Workflow Guide
Upscale AI-generated videos from 512p to 4K with Topaz and ESRGAN
Video-to-Prompt Reverse Engineering Guide
Extract recreatable prompts from AI video examples you admire
Video Prompt Pacing Guide
Structure video AI prompts for dynamic pacing across the clip duration
Vision API Batch Cost Estimator
Total cost to process 1,000 images with GPT-4o Vision or Gemini
Voice Acting Direction Prompt Builder
Write AI voice generation directions with emotion, pace, and delivery style
Voice API Cost Calculator
Compare TTS and STT costs across OpenAI, ElevenLabs, and Google
Voice Clone Recording Quality Checklist
Check your recording setup meets quality requirements for AI voice cloning
Voice Clone Training Script Formatter
Format voice clone training scripts with phonetic diversity requirements
SSML Prosody Builder
Build <prosody> SSML tags for pitch, rate, and volume control in TTS
GPU VRAM Requirements Calculator
Check if your GPU can run SD 1.5, SDXL, Flux, or video models
Waterfall Prompt Chain Cost Calculator
Total cost of a sequential prompt chain with growing context
C2PA Content Credentials Explainer
Learn how C2PA content credentials work and how to verify them
Weekly AI Cost Digest Generator
Generate a weekly cost summary from your API usage data
Words-to-Tokens Converter
Instantly convert word counts to token estimates per model
Workplace AI Monitoring Policy Generator
Draft an employee AI tool monitoring and logging policy
Writing Improvement Prompt Builder
Build precise revision prompts targeting specific writing weaknesses
LLM XML Tag Stripper
Remove or extract content from XML-style tags in Claude/LLM output.
XML Tag Token Overhead Calculator
Measure the token cost of Anthropic-style XML tags in your Claude prompts.
Zero-Shot Task Prompt Builder
Build clean zero-shot prompts for common NLP task types
Zero-Shot vs Few-Shot Cost-Quality Calculator
Is the extra token cost of few-shot worth the quality improvement?
Zero-Trust AI Access Policy Generator
Generate a zero-trust access policy for enterprise AI tools
Zod Schema Generator from JSON
Paste any JSON object and get a TypeScript Zod schema instantly.
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What Is a Token in AI? Tokens Explained
What tokens are, why AI models use them, and how to count them.
AI Reasoning Models Explained: o1, o3, Gemini Thinking vs Standard LLMs
What reasoning models are, how test-time compute works, and when to use them.
What Is Constitutional AI? Anthropic's Safety Approach Explained
How Anthropic trains models to be helpful and harmless using a written constitution.
10 Advanced AI Engineering Projects
Multi-agent pipelines, evals harnesses, and production RAG
10 AI Projects Every Beginner Should Build
Real projects, real code, real portfolio — no ML degree needed
10 AI Projects for Intermediate Developers
RAG apps, autonomous agents, and fine-tuned models to build
Advanced Prompt Engineering Techniques
Tree of Thought, self-ask, metacognitive prompts, and more
What Is Agentic AI? Agents vs Assistants Explained
How AI agents work and how they differ from chatbots
LangChain vs LlamaIndex vs AutoGen vs CrewAI: Agent Frameworks
Which AI agent framework should you build on?
AI Agents Quiz: Do You Understand Autonomous AI?
Test your knowledge of AI agents, tools, and reasoning loops
AI Agents Explained: How They Plan, Use Tools, and Self-Correct
Perception → reasoning → action: the ReAct loop at the heart of AI agents
AI and Copyright: Who Owns AI-Generated Content?
Legal FAQ on AI-generated text, images, and code ownership
AI API Keys Explained: How to Get and Use OpenAI, Anthropic, and Google Keys
Step-by-step guide to setting up AI API access
AI API Rate Limits Explained: OpenAI, Anthropic, and Google
How token-per-minute and request-per-minute limits work
What Is AI Bias? Types, Causes, and How to Detect It
Understanding and measuring bias in AI and LLMs
Best AI Certifications in 2025: A Comparison Guide
Google, Microsoft, DeepLearning.AI, and more — ranked honestly
AI Code Review Tools Compared: Copilot vs CodeRabbit vs SonarQube AI
Which AI finds the most real bugs in pull requests?
AI Coding Cheatsheet: Best Prompts for Writing and Fixing Code
Copy-paste prompts that get AI to write production-quality code
AI Coding Assistant Quiz: How Well Do You Prompt for Code?
Score your ability to get AI to write clean, working code
AI and GDPR: Can You Use AI Tools at Work Without Breaking the Law?
Practical AI compliance FAQ for European businesses
AI Content Detection Tools Compared: Accuracy and Reliability
GPTZero vs Turnitin vs Copyleaks vs Winston AI tested
AI Developer Tools Compared: LangChain vs OpenAI Assistants API vs Vercel AI SDK
Which AI developer framework is right for your project?
AI Engineer Interview Prep: Questions and Answers
50+ real questions on LLMs, RAG, agents, and ML fundamentals
AI Ethics Explained: Fairness, Accountability, and Transparency
The principles guiding responsible AI development — and why they are hard to implement
AI Flashcards: 50 Advanced Concepts for Practitioners
Level up your AI knowledge with expert-level flashcard drills
AI Flashcards: 30 Core Concepts for Beginners
Learn AI fundamentals with interactive flashcard drills
AI for Absolute Beginners: Complete Roadmap
Zero to productive AI user in 30 days — no coding required
AI for Accountants: Automate the Routine, Focus on Advice
Bookkeeping, forecasting, and client reports at 10× speed
AI for Architects and Construction Professionals
Design briefs, specs, and planning docs — AI-assisted
AI for Customer Support Teams: Build a 24/7 Help Desk
Deflect 60% of tickets automatically without losing human touch
Best AI for Customer Service: Chatbot Platforms Compared
Which AI platform builds the best customer support bots?
AI in Cybersecurity: Tools, Risks, and Defenses Compared
How AI is used in both attacks and defenses in security
Best AI for Data Analysis: ChatGPT Code Interpreter vs Gemini vs Julius
Which AI does the best job analyzing your CSV files?
AI for Data Analysts: Upgrade Your Toolkit Roadmap
Use AI to clean, analyse, visualise, and explain data 10× faster
AI for Designers: From Concept to Production
Midjourney, Figma AI, and generative tools for visual creators
AI for Developers: Learning Roadmap
Add AI to any app — APIs, RAG, agents, evals in order
AI for Doctors and Clinicians: A Practical Guide
Clinical decision support, notes automation, and safe AI use
AI for Software Engineers: Beyond Code Autocomplete
Architecture, debugging, docs, and testing — AI-native engineering
AI for Executives and C-Suite Leaders
Strategy, risk, and ROI — what every leader must know
Best AI for Finance and Accounting: Copilot vs ChatGPT vs Bloomberg AI
Which AI handles financial data, analysis, and reporting best?
AI for Financial Analysts: Faster Research, Better Models
Earnings calls, filings, and forecasts — AI in finance
AI for Government and Public Sector Workers
Policy drafting, constituent services, and data analysis with AI
AI in Healthcare: Microsoft Nuance vs Google Med-PaLM vs NHS AI
AI tools changing healthcare — compared by accuracy and safety
Best AI for HR and Recruitment: Workday AI vs Greenhouse vs Copilot
AI tools that streamline hiring, onboarding, and HR operations
AI for Journalists: Research, Drafting, and Verification
Source faster, draft quicker, and fact-check smarter
AI for Lawyers: A Practical Guide
Contract review, legal research, and drafting — at AI speed
AI for HR Professionals: From Hiring to Retention
JD writing, onboarding, and engagement — AI-powered HR
Can Lawyers Use AI? AI in Legal Practice FAQ
What AI can and can't do in legal work — with risk guidance
AI Legal Document Drafting: NDA, Contract, and Brief Templates
Prompt templates for using AI to draft and review legal documents
AI for Marketers: The Definitive Guide
Copy, campaigns, SEO, and analytics — amplified by AI
AI for Logistics and Supply Chain Professionals
Demand forecasting, route optimisation, and supplier analysis
Best AI Marketing Tools: Jasper vs Copy.ai vs HubSpot AI vs ChatGPT
Which AI helps marketers create, optimize, and scale content?
AI for Nonprofits: Do More With Less
Fundraising, outreach, and impact reports — AI on a budget
AI for Nurses and Healthcare Workers
Documentation, patient education, and shift planning with AI
AI for Operations Managers: Streamline Every Process
SOPs, scheduling, and reporting — practical AI for ops teams
AI for Product Managers: Work at 10× Speed
PRDs, user research, roadmaps, and specs — AI-assisted
Best AI Productivity Tools: Notion AI vs Microsoft Copilot vs Google Duet
Which AI workspace assistant makes you most productive?
AI for Recruiters: Source, Screen, and Hire Faster
Boolean search, JD writing, and interview prep — all AI-assisted
AI for Real Estate Professionals: A Practical Guide
Listings, valuations, and client comms — done in minutes
AI for Sales Professionals: Prospect, Pitch, and Close Faster
Lead research, email sequences, and objection handling with AI
AI for Small Business Owners: A No-Nonsense Guide
Cut admin, attract customers, and compete with big brands
AI for Students: Study Smarter, Not Harder
Research, essays, revision, and career prep — ethically
AI for Social Workers and Case Managers
Case notes, risk assessments, and referrals — AI-assisted
AI for Teachers: The Complete Classroom Guide
Save 5 hours a week — lesson plans, marking, and feedback
AI for Writers: How to Use AI Without Losing Your Voice
Drafting, editing, and ideation — keep the human, drop the block
Complete AI Glossary: 100+ Terms Every AI User Should Know
From activation functions to zero-shot — the definitive AI dictionary
AI Glossary of the Week: New Terms Explained Simply
Stay current with the latest AI vocabulary — updated weekly
What Is AI Hallucination? Why It Happens and How to Reduce It
Understanding why AI makes things up and what to do about it
AI Hallucination Spot-the-Fake Quiz: Can You Catch AI Lies?
Test whether you can identify AI-generated false information
AI Image Model Quiz: Can You Identify the Generator from the Image?
Spot whether it was Midjourney, DALL-E 3, or Stable Diffusion
AI Image Prompting Cheatsheet: Words That Work in Midjourney and DALL-E
Copy-paste prompt modifiers for stunning AI images
AI Image Style Cheatsheet: Visual Style Prompts with Examples
Every major art style, lighting mood, and camera term for image AI
AI Image Upscaling Tools Compared: Topaz vs Adobe vs MagnificAI
Best AI tools for enlarging and enhancing photos
AI in Education FAQ: Cheating, Detection, Policy, and Learning
Answers for students, teachers, and administrators on AI in schools
What Is AI Jailbreaking? How It Works and Why It Matters
How users bypass AI safety guardrails and what labs do about it
AI Job Market Guide 2025: Roles, Salaries, and Skills
Which AI jobs are real, what they pay, and how to get one
AI Model Knowledge Quiz: Name That Model from Its Features
Can you identify AI models from their key characteristics?
AI Model Pricing Comparison: Cost per Million Tokens
How much does each AI model cost? Full price breakdown
AI Safety Comparison: How ChatGPT, Claude, and Gemini Handle Harmful Requests
Which AI has the best content safety without over-restriction?
AI Music Generators Compared: Suno vs Udio vs Mubert vs AIVA
Which AI creates the best original music in 2024?
Best Sources for AI News: Newsletters, Podcasts, and Sites
Where to follow AI developments without the hype
AI Presentation Tools: Gamma vs Beautiful.ai vs Canva AI vs Copilot
Which AI builds the best slide decks automatically?
AI Product Knowledge Quiz: 30 Questions on AI Tools and Features
How well do you know the AI product landscape?
Fill in the API Parameter Quiz: OpenAI and Anthropic APIs
Test your knowledge of AI API parameters with real examples
LLM vs Chatbot Quiz: Can You Tell the Difference?
10 scenarios — is it an LLM or a rule-based chatbot?
AI History Timeline Quiz: Key Milestones from 1950 to 2024
Test your knowledge of AI history from Turing to ChatGPT
LLM Architecture Quiz: Test Your Deep AI Knowledge
20 questions on transformers, attention, and training
Prompting Patterns Quiz: Match the Technique to the Result
Can you identify zero-shot, CoT, and ReAct from outputs?
AI Company Quiz: Match the Model to Its Creator
Who made GPT-4o, Gemini, Grok, Mistral, and 20 others?
"Which AI Said This?" Quiz: Identify the Model from its Response
ChatGPT, Claude, and Gemini have distinct voices — can you tell?
AI Regulation in 2024: EU AI Act, US Executive Order, and Global Rules
Plain-English guide to AI laws that affect businesses now
AI Safety and Responsible AI: A Developer's Guide
Build safe AI products — guardrails, bias, and governance
AI Safety Quiz: 25 Questions on Alignment, Risk, and Ethics
Test your knowledge of AI safety concepts and debates
AI Search Engines Compared: Perplexity vs SearchGPT vs Gemini vs Bing AI
The new AI search landscape — who's winning?
Best AI Tools for Startups: Build vs Buy Decision Guide
Which AI services should a startup use vs build in-house?
Best AI for Summarizing Long Documents: ChatGPT vs Claude vs Gemini
Which AI gives the most accurate summaries of long texts?
30 AI Startup Ideas You Can Build in 2025
Validated, fundable, and buildable by a small team
AI Terminology Quiz: Test Your Knowledge of Key Terms
How well do you really know AI? Take the quiz to find out
ChatGPT vs Claude vs Gemini: Which AI Tool Should You Use?
Honest comparison for real tasks — not a sponsored ranking
Best AI Tools for Content Creators in 2024
The complete AI toolkit for YouTubers, bloggers, and podcasters
Best AI Tools for Designers in 2024: A Practical Comparison
AI tools that designers are actually using in production
Best AI Tools for Nonprofits: Free and Discounted Options
AI tools available at no or low cost for charitable organizations
Best AI Tools for Freelancers in 2025
Write, design, code, and invoice faster — the freelancer AI stack
Best AI Tools for Small Businesses: 2024 Practical Guide
Which AI tools actually deliver ROI for small business owners?
Best AI Tools for Startups in 2025
The lean startup AI stack — maximum output, minimum spend
Best AI Tools for Students in 2024: A Practical Comparison
Which AI helps students learn without undermining learning?
Best AI Tools for Teachers: MagicSchool vs Khanmigo vs Curipod
Which AI tools help educators save time and improve learning?
AI Tools Privacy Comparison: Who Trains on Your Data?
Which AI tools use your conversations for training?
Where Do AI Models Get Their Training Data?
What web data, books, and code go into training LLMs
AI Translation: DeepL vs Google Translate vs ChatGPT vs Gemini
Which AI translator is most accurate in 2024?
AI Trends Glossary: June 2024 — New Terms and Concepts Explained
The AI vocabulary that dominated headlines in mid-2024
AI Voice Generators Compared: ElevenLabs vs Play.ht vs Murf vs Speechify
Best AI text-to-speech tools ranked for quality and realism
AI vs Human Writing Quiz: Can You Tell the Difference?
15 passages — human or AI? Put your detection skills to the test
AI vs Human Intelligence: What AI Can and Can't Do
Pattern matching vs reasoning, memory, embodiment, and common sense
Style Transfer Prompting: Make AI Write Like You
Teach AI your writing voice and tone with these prompt patterns
Which AI Writing Tool Is Right for You? (Quiz)
10 questions to find your perfect AI writing assistant
The Attention Mechanism Explained (Plain English + Visuals)
The core innovation that powers every modern LLM
Batch vs Real-Time AI Inference: When to Use Each
Async batch processing vs synchronous AI calls — the tradeoffs
How to Become a Prompt Engineer: Complete Roadmap
The skills, portfolio, and salary guide for 2025
Best AI Chrome Extensions 2024: Full Comparison
The highest-rated AI browser extensions tested and ranked
Best AI for Coding: Claude vs GPT-4o vs Gemini vs Llama
Which AI model writes the best code? How to read the benchmarks
Best AI Courses Online in 2025 (Free and Paid)
Ranked by quality, depth, and what employers actually want
Best AI for User Research: Dovetail vs UserTesting AI vs ChatGPT
Which AI helps researchers find insights from interviews fastest?
Best AI for Email: Superhuman vs Copilot vs Gmail AI vs Claude
Which AI email tool saves the most time in your inbox?
Best AI for Images 2024: Generation, Editing, and Upscaling
Top AI image tools ranked for quality, cost, and ease of use
Best AI for Learning Languages: Duolingo AI vs ChatGPT vs Tandem
Which AI is the most effective language learning partner?
Best AI for Meeting Notes: Otter.ai vs Fireflies vs Copilot vs Krisp
Which AI captures and summarizes meetings most accurately?
Best AI for Research: Perplexity vs ChatGPT vs Claude vs Gemini
Which AI tool gives the most accurate, cited research answers?
Best AI for Social Media Content: Buffer AI vs Taplio vs ChatGPT
Which AI writes the highest-performing social media posts?
Best AI for SEO: SurferSEO vs Semrush AI vs ChatGPT vs Jasper
Which AI tool actually improves search rankings?
Best AI for Spreadsheets: Excel Copilot vs Google Sheets Duet vs ChatGPT
AI-powered spreadsheet tools compared for business users
Best AI for Video Generation: Sora vs Runway vs Pika vs Kling
AI video model comparison — quality, length, and cost
Best AI for Writing: ChatGPT vs Claude vs Gemini vs Grok
Which AI produces the most natural, accurate written content?
Best AI Model for Legal Documents: Comparison and Guide
Which AI handles contracts, briefs, and legal analysis best?
Best AI for Medical Information: Accuracy and Safety Compared
Which AI gives the most accurate, safe health answers?
Best AI Note-Taking Tools: Notion AI vs Obsidian vs Mem vs NotebookLM
Which AI helps you capture and recall information best?
Best Free AI Tools in 2024: Full Comparison
Top AI tools that are genuinely free — no credit card needed
Best Open-Source LLM in 2024: Llama 3 vs Mistral vs Phi vs Qwen
The strongest open-weight models you can run yourself
Can AI Detect AI-Written Text? The Honest Answer in 2024
What AI detection tools actually can and cannot do
Chain-of-Thought Prompting: Complete Guide with Examples
Make AI reason step-by-step with this proven technique
Chain-of-Thought Prompting: Getting AI to Show Its Work
'Let's think step by step' — why reasoning aloud improves AI accuracy
ChatGPT vs Claude vs Gemini: Full 2024 Comparison
Side-by-side breakdown of the three leading AI assistants
How Anthropic's Claude Is Built: Constitutional AI and RLHF
What makes Claude different from GPT — Constitutional AI explained
Claude's 200K Context Window vs GPT-4, Gemini, and Llama
How long-context AI models compare in real-world use
Claude Prompt Engineering Cheatsheet (Anthropic Claude)
Master Claude's prompting quirks with this reference
Claude 3.5 vs ChatGPT-4o: In-Depth 2024 Comparison
Anthropic vs OpenAI — which AI should you use daily?
What Is a Context Window? Size, Limits, and Why It Matters
Understanding token limits in GPT-4, Claude, Gemini, and more
Context Window vs Long-Term Memory in AI Agents
What the model sees right now vs what it can recall across sessions
GitHub Copilot vs Cursor vs Codeium: AI Coding Tools Compared
Three serious AI coding tools compared for working developers
Cursor vs GitHub Copilot: Best AI Coding Assistant?
Two top AI coding tools go head-to-head for developers
OpenAI Custom GPTs vs Anthropic Claude Projects: Which Is Better?
Personalized AI assistants from OpenAI and Anthropic compared
DeepSeek vs GPT-4o: China's LLM Challenger Tested
How does DeepSeek R1/V3 actually compare to OpenAI?
Diffusion Models vs GANs: Which Generates Better Images?
Why stable diffusion displaced GANs as the dominant image-gen architecture
Does AI Have Consciousness? What Science and Philosophy Say
The serious answer to a question everyone is asking
Will AI Replace Programmers? An Honest Analysis
What AI can and cannot do in software development today
Does ChatGPT Store Your Data? Privacy Policy Explained
What OpenAI keeps, shares, and how to opt out
Does Claude Store Your Conversations? Anthropic Privacy Policy
What Anthropic keeps, trains on, and how to opt out
Embeddings ELI5: How AI Understands Meaning
Words as points in space—why 'cat' and 'kitten' live next to each other in AI
Fine-Tuning ELI5: Teaching an Old AI New Tricks
Like a chef who trained in France but now specialises in sushi
AI Hallucinations ELI5: Why AI Makes Things Up Confidently
It's not lying — it's pattern-completing into plausible-sounding nonsense
AI Tokens ELI5: What the Model Actually Reads
Not words, not letters — tokens are the weird chunks AI actually processes
Neural Networks ELI5: Teaching Computers to Recognise Patterns
A network of yes/no questions that gets smarter every time it's wrong
RAG ELI5: Why AI Looks Things Up Before Answering
Like an open-book exam vs closed-book—AI with a library is smarter
How AI Works — ELI5 (Explained Like I'm 5)
Autocomplete so good it sounds smart: the simplest true explanation of AI
Transformers ELI5: The Architecture Behind Every Modern AI
Explain the transformer architecture to your grandma (and actually do it)
Embedding Models Compared: OpenAI vs Cohere vs Google vs Open-Source
Which embedding model gives the best semantic search results?
Embeddings vs Fine-Tuning vs RAG: When to Use Each
Three ways to customize AI — picked and explained
Few-Shot Prompting: What It Is and 15 Real Examples
Teach AI with examples — the practical guide
Fine-Tuning an LLM: Complete Beginner's Guide 2024
When, why, and how to fine-tune a language model
Fine-Tuning vs Prompting: How to Improve an LLM's Behaviour
Two levers for shaping AI output — one changes the weights, one doesn't
Function Calling vs Tool Use in LLMs: What's the Difference?
How AI models interact with external APIs and tools, compared clearly
Gemini vs ChatGPT: Google vs OpenAI in 2024
The two biggest AI platforms compared feature by feature
50 Generative AI Use Cases for Business
Real applications across every function — not theory
Generative AI Timeline 2023–2024: Every Major Model Release
The history of the generative AI explosion, release by release
Generative AI vs Discriminative AI: What's the Difference?
Two fundamental approaches to AI compared clearly
Getting Started with the Cohere API
Enterprise NLP — Cohere Command R+ and Embed from scratch
Getting Started with the Anthropic Claude API
Call Claude in under 5 minutes — auth, messages, streaming
Getting Started with the Google Gemini API
Build your first multimodal AI app with Gemini
Activation Function (AI Glossary)
The non-linearity that lets neural networks learn complex patterns
Agent (AI Glossary)
An AI system that perceives, reasons, and acts in loops to achieve a goal
Attention (AI Glossary)
Weighted focus on relevant tokens: the mechanism at the heart of transformers
Backpropagation (AI Glossary)
The algorithm that teaches neural networks by propagating error backwards
Base Model (AI Glossary)
A pre-trained LLM before any fine-tuning or instruction alignment
AI Benchmarks (AI Glossary)
MMLU, HumanEval, HellaSwag: how we measure whether AI is getting better
Batch Size (AI Glossary)
How many training examples to process at once before updating model weights
CLIP (AI Glossary)
OpenAI's contrastive image-language model that connects vision and text
Context Window (AI Glossary)
The maximum tokens an LLM can see at once: the AI's working memory limit
Cross-Entropy Loss (AI Glossary)
The standard loss function for classification and language model training
Diffusion Model (AI Glossary)
Generating data by learning to reverse a noise-addition process
Dropout (AI Glossary)
Randomly disabling neurons during training to prevent overfitting.
Embedding (AI Glossary)
A dense vector representation encoding semantic meaning in high-dimensional space
Few-Shot Learning (AI Glossary)
Giving an LLM 2–10 examples in the prompt to show exactly what you want
Fine-Tuning (AI Glossary)
Updating a pre-trained model's weights on a task-specific dataset
Encoder-Decoder Architecture (AI Glossary)
Compressing input into a representation, then expanding it to output.
FP16 and BF16 (AI Glossary)
Mixed-precision training formats that halve GPU memory without sacrificing accuracy
GAN — Generative Adversarial Network (AI Glossary)
Generator vs discriminator: the adversarial training framework for generative models
Grounding (AI Glossary)
Anchoring AI output to verifiable facts or sources—the antidote to hallucination
Generation (AI Glossary)
Producing new content—text, image, audio, video—from a trained model
Gradient Descent (AI Glossary)
The optimisation algorithm that minimises loss by following the slope downhill.
Hallucination (AI Glossary)
When AI generates confident, fluent text that is factually wrong.
Hyperparameter (AI Glossary)
Settings you configure before training that the model cannot learn itself.
Inference (AI Glossary)
Running a trained model on new inputs to generate outputs — not training.
Instruct Model (AI Glossary)
A base model fine-tuned to follow instructions rather than just complete text.
KV Cache (AI Glossary)
The efficiency trick that stops transformers recomputing attention every token.
Layer Normalisation (AI Glossary)
Stabilising deep network training by normalising activations within each layer.
Learning Rate (AI Glossary)
How large a step the optimiser takes when updating weights—the most critical hyperparameter.
LLM — Large Language Model (AI Glossary)
The class of AI model behind ChatGPT, Claude, Gemini, and Llama
Latent Space (AI Glossary)
The compressed internal representation where models encode meaning.
LoRA — Low-Rank Adaptation (AI Glossary)
Fine-tune a 70B model on a laptop by only updating a tiny fraction of weights.
Loss Function (AI Glossary)
The objective that measures how wrong a model's predictions are
Mixture of Experts (AI Glossary)
Routing tokens to specialised sub-networks to scale beyond dense limits
MCP — Model Context Protocol (AI Glossary)
The open protocol connecting AI assistants to external tools and data sources
Multi-Head Attention (AI Glossary)
Running attention in parallel across subspaces for richer representations
Next-Token Prediction (AI Glossary)
The deceptively simple objective that gave rise to powerful LLMs
Overfitting (AI Glossary)
When a model memorises its training data instead of learning to generalise
Perplexity (AI Glossary)
The standard way to measure how well an LLM predicts text — lower is better
Parameters (AI Glossary)
The learned weights and biases that define what an AI model knows
Positional Encoding (AI Glossary)
How transformers know token order when attention is position-agnostic
Pre-Training (AI Glossary)
The large-scale self-supervised phase that gives LLMs general knowledge
Quantization (AI Glossary)
Reducing model weight precision from float32 to int8 or int4 to save memory
RAG — Retrieval-Augmented Generation (AI Glossary)
Combining LLM generation with real-time retrieval for grounded, up-to-date answers
Prompt (AI Glossary)
The input text given to an LLM to elicit a desired output
Residual Connection (AI Glossary)
Skip connections that let gradients flow through very deep networks
RLHF — Reinforcement Learning From Human Feedback (AI Glossary)
The training technique that turns a capable LLM into a helpful AI assistant
Self-Attention (AI Glossary)
How every token in a sequence attends to every other token simultaneously
Softmax (AI Glossary)
The function that turns raw logits into a probability distribution
System Prompt (AI Glossary)
The hidden instructions that shape an AI assistant's persona and constraints
Temperature (AI Glossary)
The dial that controls how random vs deterministic an LLM's output is
Token (AI Glossary)
The fundamental unit of text that LLMs process: not a word, not a character
Top-K Sampling (AI Glossary)
Restricting LLM sampling to the K most likely next tokens at each step
Top-P / Nucleus Sampling (AI Glossary)
Keep only the smallest set of tokens whose probabilities sum to P
Tokenizer (AI Glossary)
The pre-processing step that splits text into tokens before the model sees it
Transfer Learning (AI Glossary)
Reusing knowledge learned on one task to speed up learning on another
Transformer (AI Glossary)
The architecture introduced in 'Attention Is All You Need' that powers all modern LLMs
Zero-Shot Learning (AI Glossary)
Asking an AI to do a task it has never been explicitly shown how to do
Vector Database (AI Glossary)
A database optimised for storing and querying high-dimensional embedding vectors
Weight (AI Glossary)
A single learnable number in a neural network that gets updated during training
GPT-4o Multimodal Guide: Images, Audio, and Text Together
Everything you can do with GPT-4o's native multimodal features
GPT-4o vs o1 vs o3: Which OpenAI Model Should You Use?
OpenAI's model lineup decoded — when each one wins
GPT Architecture Explained: How OpenAI's Models Are Built
Decoder-only transformers, causal masking, and the design choices behind GPT
GPT vs BERT: Two Transformer Architectures Compared
Decoder-only vs encoder-only: when to use each model family
GPT vs Claude vs Gemini: How the Top LLMs Compare
Architecture, training philosophy, strengths, and weaknesses — side by side
Grok vs ChatGPT vs Claude: xAI's Model Tested
How does xAI's Grok compare to the market leaders?
History of Artificial Intelligence: From 1950 to the LLM Era
The 70-year journey from Turing and Minsky to GPT-4 and beyond
How Context Windows Work: KV Cache, Attention, and Memory
The technical reality behind 'long context' AI claims
How Attention Mechanisms Work in Neural Networks
Why "attention" lets AI focus on what matters in a sentence
How Do Large Language Models Work? Inside the Black Box
Tokens, attention, and next-word prediction: the core mechanics of LLMs
How Does ChatGPT Work? A Deep Technical Explanation
From pre-training on the web to RLHF to your chat window—the full pipeline
How Does Stable Diffusion Work? Image Generation Explained
Latent diffusion, CLIP conditioning, and the U-Net denoiser—all decoded
How Large Language Models Work: A Plain-English Explanation
From next-token prediction to GPT-4 — no maths needed
How Much Does It Cost to Train an LLM?
GPT-4 cost hundreds of millions; here is how AI training costs are calculated
How GPT-4 Differs From GPT-3: What Actually Changed?
Multimodality, RLHF improvements, and reliability: the GPT-3 to GPT-4 leap
How Many Tokens Is a Word? Token Counting Explained
Quick answer: tokens, words, and characters in LLMs
How Neural Networks Learn: Backpropagation and Gradient Descent
The maths behind training: how errors propagate backwards to update weights
How to Add AI to an Existing App
Bolt AI onto your product without a full rewrite
How to Build a Chatbot with the OpenAI API
Step-by-step: connect to GPT-4, handle context, deploy in 30 minutes
How to Build a PDF Q&A Bot
Upload any PDF, ask questions — build it in 45 minutes
How to Build an AI App with Python and Flask
Backend AI API in Python — from zero to deployed
How to Build an AI App with Next.js and Vercel
Full-stack AI in a weekend — Vercel AI SDK end to end
How to Build an AI Code Review Tool
Automated PR feedback powered by GPT-4 and GitHub Actions
How to Build an AI App with Supabase and pgvector
Auth, DB, and vector search — all in one Supabase project
How to Build an AI Content Moderation System
Automatically flag harmful content before it goes live
How to Build an AI Customer Support Bot
Resolve 60% of tickets without a human — step by step
How to Build an AI Email Assistant
Draft, classify, and summarise emails automatically
How to Build an AI Data Analyst (Chat with Your CSV)
Upload a spreadsheet, ask questions in plain English
How to Build an AI-Powered Feedback Collection Tool
Open-ended survey analysis at scale — themes in seconds
How to Build an AI Image Generation App
DALL·E 3 and Stable Diffusion — build a full image app
How to Build an AI Legal Contract Analyser
Red-flag clauses, missing terms, and plain-English summaries
How to Build an AI Meeting Summariser
Auto-transcribe and summarise every meeting in seconds
How to Build an AI News Aggregator
Fetch, summarise, and personalise news with LLMs
How to Build an AI-Powered User Onboarding Flow
Personalise onboarding at scale with LLMs
How to Build an AI Portfolio That Gets You Hired
3 projects, a GitHub, and a demo site — land your first AI job
How to Build an AI-Powered Blog
Research, outline, draft, and SEO-optimise — all with AI
How to Build an AI-Powered REST API
Wrap any LLM in a production-ready API in one afternoon
How to Build an AI-Powered Smart Form
Forms that understand intent and fill themselves out
How to Build an AI-Powered CRM Feature
Enrich contacts, summarise deals, and suggest next actions
How to Build an AI-Powered Product Changelog
Auto-generate release notes from commits and PRs
How to Build an AI-Powered Mobile App with React Native
LLM features in iOS and Android — Expo and the OpenAI API
How to Build an AI Product: From Idea to Launch
The founder's playbook — validate, build, and ship an AI app
How to Build AI-Powered Search in Next.js
Semantic search with instant results — better than keyword search
How to Build an AI Quiz Generator
Turn any text into a quiz in seconds
How to Build an AI Recommendation Engine
Collaborative filtering meets LLMs — personalise anything
How to Build an AI Slack Bot
Bring GPT-4 into your team's workspace in 1 hour
How to Build an AI Search Engine for Your Documentation
Natural-language search across all your docs — no keywords
How to Build an AI Text Summarisation Tool
Summarise articles, reports, and long docs in seconds
How to Build an AI Resume Screener
Score CVs against a job spec — fairly and transparently
How to Build an AI Telegram Bot
Personal AI assistant in your pocket — Python Telegram Bot
How to Build an AI Tutor App
Personalised explanations, quizzes, and feedback for any subject
How to Build an AI Agent from Scratch
Give your LLM tools, memory, and the ability to act
How to Build an AI Video Analyser
Extract transcripts, chapters, and insights from any video
How to Build an AI Writing Assistant
Grammar, style, and tone suggestions in your own app
How to Build a Chatbot with Long-Term Memory
Remember past conversations — persistent user context
How to Build a Custom GPT on OpenAI
Instructions, knowledge files, and actions — step by step
How to Build a Document Intelligence App
Extract, classify, and query any document automatically
How to Build a Knowledge Base Powered by an LLM
Internal wiki that you can actually ask questions
How to Build Headless AI Workflows with n8n
Automate anything — n8n nodes, LLMs, and APIs in sequence
How to Build a Multi-Agent AI System
Orchestrator, workers, and memory — multi-agent from scratch
How to Build a Multilingual AI App
Detect language, translate, and respond in 50+ languages
How to Build a Personalised AI Newsletter
Curate, summarise, and deliver content readers love
Build a RAG App with LlamaIndex and OpenAI: Full Tutorial
The most popular RAG stack — step by step from scratch
How to Build RAG with pgvector and PostgreSQL
No extra infra — RAG with your existing Postgres database
How to Build a Semantic Search Engine with AI
Search by meaning, not keywords — powered by embeddings
How to Build RAG with Pinecone
Managed vector search — index, upsert, query in minutes
How to Choose the Right LLM for Your Application
GPT-4, Claude, Gemini, Mistral — a decision framework
How to Create Text Embeddings with OpenAI
Turn words into vectors — the foundation of semantic AI
How to Deploy an AI App to Production
From localhost to live — Vercel, Railway, and secrets
How to Build a Voice AI App with Whisper and TTS
Speech-to-text, LLM processing, text-to-speech — full loop
How to Deploy an LLM Wrapper with FastAPI
Production-ready LLM API in Python — a 30-minute tutorial
How to Deploy an Open-Source LLM on AWS
Self-host Llama 3 on EC2, ECS, or SageMaker
How to Evaluate LLM Outputs: A Developer's Guide to Evals
Stop guessing — measure quality, accuracy, and regression
How to Fine-Tune an LLM with Hugging Face
LoRA and QLoRA fine-tuning on any open-source model
How to Fine-Tune GPT-4o Mini on Your Own Data
Teach GPT your tone, format, and domain knowledge
How to Implement AI Guardrails in Your App
Block harmful outputs before they reach users
How to Implement RAG with Source Citations
Answers users trust — every claim linked to its source
How to Integrate AI into WordPress
AI writing, chatbots, and search — no coding required
How to Monitor AI Apps in Production
Track quality, cost, latency, and drift after launch
How to Manage LLM Costs in Production
Cut your AI bill without degrading quality
How to Price AI Products and Features
Token costs, margins, and pricing models that work
How to Reduce LLM Hallucinations in Production
Ground, verify, and catch AI mistakes before users do
How to Reduce AI Hallucinations: A Practical Playbook
Seven proven techniques to make LLM outputs more accurate and grounded
How to Scrape the Web with AI
Extract structured data from any website using LLMs
How to Run LLMs Locally with Ollama
Llama 3, Mistral, and Gemma — private AI on your laptop
How to Secure AI Applications Against Common Attacks
Prompt injection, data leakage, and model abuse — defended
How to Set Up RAG (Retrieval-Augmented Generation)
Ground your LLM in real documents — no hallucinations
How to Stream LLM Responses in Next.js
Real-time token streaming with the Vercel AI SDK
How to Test AI Applications
Unit tests, integration tests, and evals for LLM-powered apps
How to Use AI for Business Strategy and Planning
SWOT, competitor maps, and strategic plans — AI-assisted
How to Use AI for Academic Writing (Ethically)
Outlines, editing, and citations — within academic integrity rules
How to Use AI for Competitive Analysis
Research 10 competitors in 1 hour with AI
How to Use AI to Document Your Code
Docstrings, READMEs, and changelogs — written by AI
How to Use AI to Monitor Competitors Continuously
Price changes, new features, and content shifts — tracked
How to Use AI for Crisis Communications
Rapid statements, holding lines, and media responses — AI-assisted
How to Use AI for Data Cleaning and Preparation
Normalise, deduplicate, and enrich messy data with LLMs
How to Use AI for Event Planning
Venue research, run-of-show, and communications — AI-assisted
How to Use AI for E-Commerce
Product descriptions, recommendations, and support — automated
How to Use AI for Grant Writing
Win more funding — research, draft, and polish with AI
How to Use AI for Language Learning
Conversation practice, correction, and explanations — 24/7
How to Use AI for Mental Health Support (Safely)
Journaling, CBT exercises, and signposting — with guardrails
How to Use AI to Streamline Healthcare Administration
Scheduling, billing, and referrals — admin AI without risk
How to Use AI for Music and Audio Production
Lyrics, stems, and production notes — AI creative tools
How to Use AI in Insurance Underwriting
Document analysis, risk scoring, and triage — AI in insurance
How to Use AI for Patent Research
Prior art, novelty analysis, and claims — AI-assisted IP
How to Use AI for Personal Finance
Budget reviews, investment research, and financial planning
How to Use AI for Academic and Professional Research
Literature review, synthesis, and citation — AI-assisted
How to Use AI for Personal Productivity
Email, tasks, and decisions — a daily AI workflow
How to Use AI for SEO Content Creation
Rank, don't spam — AI content Google actually rewards
How to Use AI for Social Media Marketing
Hooks, captions, threads, and scheduling — on autopilot
How to Use AI for Translation and Localisation
Translate content into 100 languages — accurately and affordably
How to Use the ChatGPT API: Beginner's Guide
Your first API call to GPT-4 in 10 minutes
How to Use AI for UX Research
Interview synthesis, persona generation, and affinity mapping
How to Use AutoGen for Multi-Agent AI
Microsoft AutoGen — conversational agents that collaborate
How to Use Claude Code: A Developer's Guide
Terminal AI that reads your repo and ships code
How to Use Claude's Model Context Protocol (MCP)
Connect Claude to your tools, databases, and APIs
How to Use GitHub Copilot Effectively
Stop fighting Copilot — work with it to 10× your output
How to Use CrewAI to Build AI Agent Teams
Roles, tasks, and tools — CrewAI from hello world to prod
How to Use Cursor: The AI Code Editor Guide
Codebase context, inline edits, and agent mode — mastered
How to Use GPT-4 Vision for Image Analysis
Describe, classify, and extract data from images with GPT-4V
How to Use Function Calling with OpenAI
Give GPT real-world actions — the definitive function-calling guide
How to Use LlamaIndex for RAG Applications
Index anything, query everything — LlamaIndex deep dive
How to Use LangChain: Beginner's Guide
Chains, agents, and memory — LangChain from zero
Getting Started with the Mistral AI API
Fast, affordable, and open — Mistral from zero to prod
How to Use the OpenAI Assistants API
Threads, tools, and file search — the managed agent API
How to Use Make and Zapier for AI Automation
No-code AI workflows — connect your tools in 20 minutes
How to Use NotebookLM: A Practical Guide
Google's AI research assistant — audio overviews and Q&A
How to Use Structured Outputs with OpenAI
Get reliable JSON from GPT-4 — no more parsing hacks
How to Use Vector Databases: A Developer's Guide
Pinecone, pgvector, Weaviate, Qdrant — which and when
How to Write Prompts for Coding Tasks
Get better code from AI — 20 patterns with before/after
How to Write Prompts for Content Creation
Blogs, social posts, and ad copy — prompts that convert
AI Inference Speed Compared: Tokens Per Second for Major Models
Which AI model responds fastest? Latency benchmarks
Introduction to AI Ethics: What Developers Must Know
Bias, fairness, and accountability — the ethical AI primer
Introduction to Transformer Architecture (No PhD Required)
Attention, tokens, and weights — explained with intuition
Is ChatGPT Down Right Now? How to Check and What to Do
Quick guide to diagnosing and routing around ChatGPT outages
Is ChatGPT Free? Limits, Plans, and What You Actually Get
Honest answer to ChatGPT's pricing and free-tier restrictions
Is ChatGPT Safe to Use? Security, Privacy, and Risks Explained
What you should and shouldn't share with ChatGPT
Knowledge Distillation in AI: How Smaller Models Learn from Larger Ones
How big-model knowledge gets compressed into efficient smaller models
Llama 3 vs Mistral vs Qwen: Open-Source LLM Showdown
Which open-source language model is best for self-hosting?
AI Model Benchmarks Explained: MMLU, HumanEval, HELM, and More
What AI leaderboard scores actually mean
LLM Benchmarks Explained: MMLU, HumanEval, and LMSYS Chatbot Arena
What these leaderboards actually measure, and the limitations to know
Understanding LLM Context Windows: A Developer's Guide
Tokens, limits, and strategies for long-document tasks
Fine-Tuning vs Prompt Engineering: Which Is Worth the Effort?
Two ways to adapt AI — when each delivers better ROI
LLM Glossary: The Key AI and Machine Learning Terms Explained
A plain-English dictionary of the AI terms that actually matter
Running AI Locally vs Cloud: Pros, Cons, and When to Choose Each
On-device LLMs vs cloud APIs — the full comparison
LoRA Explained: Low-Rank Adaptation for Fine-Tuning LLMs
The efficient fine-tuning technique everyone is using
Machine Learning vs Deep Learning: What's the Difference?
Understand where classical ML ends and neural-network DL begins
Markdown for AI Prompts: Does Formatting Actually Help?
Cheatsheet for using markdown structure in LLM prompts
Midjourney vs DALL-E 3 vs Stable Diffusion vs Flux: Image AI Compared
Which AI image generator produces the best results in 2024?
Mixture of Experts (MoE) Explained: Why GPT-4 and Mixtral Use It
The architecture trick that makes large AI models efficient
ML Engineer Roadmap 2025
From Python basics to deploying production ML systems
What Is Model Context Protocol (MCP)? Anthropic's Standard Explained
MCP demystified: how AI tools talk to external systems
Model Size Explained: 7B, 13B, 70B — What Do These Numbers Mean?
Billions of parameters decoded: capacity, memory, and the quality trade-offs
Multimodal AI Comparison: GPT-4o vs Gemini 1.5 vs Claude 3.5
Which AI handles images, audio, and text best together?
Multimodal AI Explained: Text + Images + Audio in One Model
From CLIP to Gemini: the evolution of models that understand everything
Neural Networks Explained: From Perceptron to Transformer
The complete visual guide to how neural networks learn
NLP vs LLMs: What's the Difference?
Traditional natural language processing vs large language models
On-Premise AI vs Cloud AI: Enterprise Decision Guide
Build your own AI stack or use APIs — the full tradeoffs
Open-Source vs Closed AI Models: Full Comparison
Should you use Llama, Mistral, or a proprietary model?
OpenAI API Cheatsheet: Parameters, Models, and Endpoints
The quick-reference guide every OpenAI API developer needs
OpenAI vs Anthropic vs Google DeepMind: Company Comparison
The three leading AI labs compared on research, products, and safety
Perplexity vs ChatGPT for Research: Which Is More Accurate?
Real-time search AI vs generative AI for fact-finding
Small AI Models Compared: Phi-3 vs Gemma vs Llama 3 8B
Which compact LLM is best for on-device and edge AI?
Pre-Training vs RLHF: The Two Stages That Make an AI Assistant
World knowledge vs human-aligned behaviour — two very different training phases
Advanced Prompt Engineering Techniques
Beyond the basics: meta-prompting, self-refinement, and structured output
Prompt Engineer Interview Prep Guide
Pass the PE interview — techniques, portfolio, and case studies
Prompt Engineering Cheatsheet: 50+ Techniques with Examples
The complete reference for writing better AI prompts
Prompt Engineering Fundamentals: Mini-Course
10 lessons, zero fluff — the only PE guide you need
Prompt Engineering Fundamentals: How to Write Better AI Prompts
The craft of writing prompts that consistently get the output you want
Prompt Engineering Quiz: 14 Questions from Beginner to Expert
Test your prompting skills across all difficulty levels
Python for AI: A Beginners Crash Course
Learn just enough Python to build and call AI APIs
Quantization Methods Compared: GPTQ vs AWQ vs GGUF
Which quantization format should you use for local LLM inference?
RAG Explained: Retrieval-Augmented Generation in Plain English
How AI looks things up before answering — and why it reduces hallucinations
RAG vs Fine-Tuning: Which Should You Use?
Retrieval-Augmented Generation vs fine-tuning explained clearly
Regex with AI: Cheatsheet for Prompting AI to Write Patterns
Get perfect regex from ChatGPT, Claude, and Copilot every time
RLHF Explained: How AI Models Learn from Human Feedback
The training technique behind ChatGPT and Claude, demystified
Responsible AI Cheatsheet: Principles, Red Lines, and Practices
Quick reference for building ethical AI products
Scaling Laws in AI: Why Bigger Models Are (Usually) Better
The Chinchilla paper and the empirical rules governing how AI performance scales
Speculative Decoding Explained: How AI Generates Text Faster
The inference optimization technique powering faster LLMs
Stable Diffusion vs Midjourney: Which Should You Use?
Self-hosted vs managed AI image generation compared
System Prompt Cheatsheet: How to Write Effective System Prompts
Templates and best practices for LLM system instructions
System Prompt Design: A Complete Guide
The first message that shapes everything — design it right
Can You See a Product's System Prompt? Prompt Leaking Explained
How system prompt extraction works and how to prevent it
Tokenization in LLMs: How Text Becomes Numbers
What tokens are, how they work, and why they affect your costs
Top 20 Real-World AI Use Cases in 2024 (with Tools)
The 20 ways AI is actually being used in businesses right now
Top-P and Top-K Sampling Explained
The two sampling strategies that keep AI responses coherent yet creative
Top-p vs Temperature in LLMs: What's the Difference?
Nucleus sampling vs temperature sampling explained with examples
Training vs Inference in AI: What's the Difference?
Learning the model vs using it: the two very different compute phases
Transformer Architecture Explained: The Model Behind All LLMs
How transformers work — from attention to output tokens
Vector Database Comparison: Pinecone vs Weaviate vs Qdrant vs pgvector
Which vector database should you use for your AI app?
Vector Embeddings Explained: Meaning as Math
King − Man + Woman = Queen: the magic behind AI's grasp of meaning
What Are AI Agents? Autonomous AI That Plans and Acts
From single-turn chatbots to goal-seeking agents that use tools and loop
What Are Parameters in an AI Model?
The numbers inside a model — and why 7B vs 70B makes such a big difference
What Are Embeddings in Machine Learning?
How AI turns words, images, and ideas into numbers it can reason about
What Are Tokens in AI? How LLMs Read and Write Text
Tokens aren't words—here's what they actually are and why it matters
What Does Temperature Do in AI? (0.0 to 2.0 Explained)
The definitive guide to the temperature parameter in LLMs
What Is a Chat Model? How AI Gets Trained for Conversation
Chat format, turn structure and the training that makes models conversational.
What Is a Context Window in an LLM?
The AI equivalent of short-term memory — why it matters and how to use it
What Is a Diffusion Model? How AI Generates Images From Noise
Stable Diffusion, DALL-E, and Midjourney: the maths in 5 minutes
What Is a Foundation Model API? Accessing AI Without Training
OpenAI, Anthropic, Google — how developers access frontier AI as a service
What Is a GAN? Generative Adversarial Networks Explained
A generator and a discriminator in an adversarial game — and why that works
What Is a Foundation Model?
Pre-trained on everything, fine-tuned for anything: the paradigm shift in AI
What Is a Large Language Model (LLM)?
The technology behind ChatGPT, Claude, and Gemini—simply explained
What Is a Multimodal AI Model?
Models that see, hear, and read: how AI processes text, images, and audio together
What Is a Neural Network? How AI Learns Like a Brain
Neurons, weights, and backprop: the foundation of modern AI explained
What Is a System Prompt? How AI Assistants Are Programmed
The invisible set of instructions that shapes every AI assistant's behaviour.
What Is a Transformer? The Architecture Behind Modern AI
"Attention is all you need"—decoded for curious non-researchers
What Is a Vector Database? How AI Finds Similar Content at Scale
Why Pinecone, Weaviate, and Qdrant exist—and when you need one
What Is Agentic AI? From Single-Turn to Goal-Seeking Systems
AI that plans, acts, observes, and loops — not just answers questions
What Is AGI? Artificial General Intelligence Explained
The difference between today's AI and true AGI
What Is AI Alignment? Making AI Do What Humans Actually Want
The hardest problem in AI: specifying and reliably getting the right behaviour
What Is AI Bias? How Unfairness Enters Machine Learning Systems
Data bias, model bias, and the real-world harm they cause — explained
What Are AI Hallucinations? Why LLMs Make Things Up
Why confident AI answers are sometimes completely wrong, and what to do
What Is AI Reasoning? How LLMs Approach Logic and Problem-Solving
Multi-step deduction, maths, and code: what 'reasoning' means for current AI
What Is AI Safety? A Beginner's Introduction
Alignment, robustness, interpretability: the field dedicated to safe AI systems
What Is an Autoencoder? Compression and Generation in Neural Networks
Squeeze data through a bottleneck and rebuild it: learning compressed representations
What Is a Large Language Model (LLM)? Explained Simply
The clearest explanation of what LLMs are and how they work
What Is Anthropic? The AI Safety Company Behind Claude
Constitutional AI, interpretability research, and responsible scaling—explained
What Is Artificial Intelligence? A Complete Beginner's Guide
From Turing tests to large language models: what AI actually means today
What Is Beam Search? Better Text Generation Through Exploration
Keeping the K best partial sequences at each step to avoid greedy mistakes
What Is BERT? Google's Bidirectional Transformer Explained
Masked language modelling and the encoder model that dominated NLP
What Is Chain-of-Thought Reasoning in LLMs?
Why prompting AI to 'think aloud' dramatically improves complex reasoning
What Is Computer Vision? How AI Sees and Understands Images
CNNs, ViTs, and the tasks that let machines perceive the visual world
What Is a CNN? Convolutional Neural Networks Explained
The architecture that gave AI the ability to recognise faces and cats
What Is Deep Learning? The Technology Behind Modern AI
Many layers of representation: why depth is the secret ingredient in modern AI
What Is Differential Privacy in AI?
Mathematical guarantees that an AI model leaks nothing about any individual
What Is DPO? Direct Preference Optimization Explained
Fine-tuning on human preferences without a reward model — simpler than RLHF
What Are Emergent Capabilities in AI?
Abilities no one explicitly trained for—and why they appear above a certain model size
What Is Federated Learning? Training AI Without Centralising Data
Train on phones and hospitals without the data ever leaving the device
What Is Fine-Tuning an AI Model?
Teaching a pre-trained model new tricks without starting from scratch
What Is Generative AI? A Plain-English Explanation
Text, images, code, and audio — how generative AI works
What Is Generative AI? Text, Images, Code, and Beyond
The class of AI models that create new content, not just classify existing data
What Is Flash Attention? Faster Transformers Without Approximation
IO-aware exact attention that is 2-4x faster and uses far less memory
What Is Google DeepMind? The Lab Behind Gemini, AlphaGo, and AlphaFold
The merger that united game-playing agents with search-scale language models
What Is GPT? Generative Pre-Trained Transformer Explained
The foundational answer to what makes ChatGPT work
What Is Grounding in AI? Connecting Outputs to Verifiable Facts
How retrieval, citations and verification tether AI answers to reality.
What Is Grounding in AI? How It Reduces Hallucination
How RAG and search grounding anchor AI answers in reality
What Is Hugging Face? The Home of Open-Source AI Models
Model hub, Transformers library, and the GitHub of AI — explained
What Is In-Context Learning in LLMs?
Learning from examples in the prompt — without updating any model weights.
What Is Instruction Tuning? How Base LLMs Become Assistants
Fine-tuning on instruction-response pairs turns autocomplete into a chatbot
What Is Inference in AI? Training vs Inference Explained
The key difference between teaching AI and using AI
What Is Instruction Following in LLMs?
How language models learned to actually do what you ask them
What Is AI Interpretability? Opening the Black Box
How researchers try to understand what's happening inside neural networks
What Is LangChain? Building LLM Applications With Composable Chains
The developer framework that made agent and RAG pipelines accessible
What Is LLaMA? Meta's Open-Source Language Model Explained
The model that democratised LLM research—and sparked a thousand fine-tunes
What Is AI Jailbreaking? How Users Bypass Safety Guardrails
DAN prompts, roleplay escapes, and why safety alignment is an arms race
What Is LoRA? Low-Rank Adaptation for Efficient LLM Fine-Tuning
Fine-tune a giant model by updating only a tiny fraction of its weights
What Is Mistral? The Efficient Open LLM From Paris
Sliding window attention, MoE, and the 7B that punched above its weight
What Is Machine Learning? How Computers Learn From Data
ML explained without the jargon: patterns, predictions, and training data
What Is Mixture of Experts (MoE) in AI?
How models like Mixtral and GPT-4 scale to huge sizes efficiently
What Is Model Collapse? Why AI Training on AI-Generated Data Fails
The new AI risk: models trained on their own outputs degrade
What Is Model Compression? Making AI Models Smaller and Faster
Quantization, pruning, distillation, and architecture search for edge AI
What Is MCP? The Model Context Protocol for AI Tools
The open standard that lets AI assistants connect to any tool or data source
What Is Knowledge Distillation in AI?
How smaller, faster student models learn from larger teacher models
What Is Model Pruning in AI?
Removing unimportant weights to shrink models without sacrificing accuracy
What Is Multi-Agent AI? Coordinating Multiple AI Systems
Orchestrators, sub-agents, and swarms: how AI systems collaborate on complex tasks
What Is Model Quantization? Running AI With Less Memory
INT8, INT4, GPTQ, AWQ: shrinking models without destroying performance
What Is Named Entity Recognition (NER)?
How AI finds people, places, dates, and organisations in raw text
Why Does AI Run on GPUs? NVIDIA's Role in the AI Revolution
CUDA, parallel matrix math, and why H100s are worth $30K each
What Is OpenAI Function Calling? How LLMs Interact With APIs
Structured JSON outputs that let LLMs reliably call real-world functions.
What Is NLP? Natural Language Processing Before the LLM Era
Parsing, tagging, entity recognition — the NLP foundation LLMs are built on
What Is Multimodal AI? Text, Images, Audio, and Video Combined
How AI handles more than just text — the plain explanation
What Is OpenAI? The Company Behind ChatGPT and GPT-4
From nonprofit lab to capped-profit: the history and mission of OpenAI
What Is Prompt Injection? How It Works and How to Prevent It
The AI security vulnerability every developer must understand
What Is Pre-Training? How LLMs Learn From the Whole Internet
The trillion-token self-supervised stage that gives LLMs their world knowledge
What Is System Prompt Leakage? An AI Security Guide
When hidden instructions are extracted from AI systems—and how to prevent it
What Is an RNN? Recurrent Neural Networks and Sequence Modelling
Before transformers: how RNNs processed sequences with hidden state
What Is Reinforcement Learning? How AI Learns From Rewards
Agents, environments, rewards: teaching AI through trial and error
What Is a Reward Model in RLHF?
The proxy human that scores model outputs during reinforcement learning
What Is Rotary Positional Encoding (RoPE)?
How LLaMA and Mistral encode position to generalise to long contexts
What Is Self-Supervised Learning?
How AI creates its own labels from unlabelled data—the key to web-scale training
What Is Semantic Search? How AI Understands Query Intent
Finding documents by meaning, not keywords — how modern search engines work
What Is RLHF? Reinforcement Learning From Human Feedback Explained
How human raters teach AI to be helpful, harmless, and honest
What Is Sparse Attention? Scaling Transformers to Longer Sequences
When full quadratic attention is too slow, sparse patterns cut the cost
What Is Speculative Decoding? Faster LLM Inference With a Draft Model
Using a small fast model to propose tokens the large model verifies in parallel
What Is AI Speech Recognition? How Machines Transcribe Audio
Whisper, wav2vec, and the deep learning models that power voice-to-text
What Is Supervised Learning? How AI Learns From Labelled Data
Labels, features, and predictions: the foundational ML paradigm explained
What Is Structured Output in LLMs? Guaranteed JSON From AI
Constrained decoding and JSON mode — reliable machine-readable AI responses.
What Is T5? Text-to-Text Transfer Transformer Explained
Treating every NLP task as text-in, text-out: Google's unified T5 model
What Is Text Classification in AI? Sentiment, Spam, and Intent
Assigning labels to text: how AI categorises emails, reviews, and messages
What Is Text-to-Image AI? How AI Generates Images From Text
DALL-E, Midjourney, and Stable Diffusion: the technology behind AI art
'Attention Is All You Need': The Paper That Changed AI
The 2017 Google paper that introduced transformers and made LLMs possible
What Is Temperature in AI? Controlling Randomness in LLM Output
Why 0.0 makes AI predictable and 2.0 makes it wild — and everything between
What Is Text-to-Speech AI? How Machines Learned to Speak
From robotic TTS to ElevenLabs-quality voice cloning, explained
What Is the Turing Test? Does AI Actually Pass It?
Imitation, intelligence, and why passing the Turing test matters less than we thought
What Is Tool Use in AI? How LLMs Call APIs and Run Code
Function calling, code interpreters, and web search: AI beyond text
What Is Word2Vec? The Embedding That Started the AI Revolution
Skip-gram and CBOW: how Google's 2013 word embeddings changed everything
What Is Unsupervised Learning? Finding Patterns Without Labels
Clustering, dimensionality reduction, and generative models with no ground truth
Which AI Model Should I Use? A Complete Choosing Guide
Decision guide for picking the right LLM for any task
Which AI Tool Is Right for You? (Interactive Quiz)
Answer a few questions and get your perfect AI tool match
Which AI Model Is Most Accurate? Factuality Benchmarks Compared
Ranked: the least-hallucinating AI models of 2024
Why Do LLMs Hallucinate? The Technical Reason Explained
The real cause of AI making up facts — not what you think
Zero-Shot vs Few-Shot vs Fine-Tuning: When to Use Each
Three ways to get AI to do new tasks, picked by experts
Zero-Shot, One-Shot, and Few-Shot Learning Explained
Teaching AI with zero, one, or a handful of examples — when each works
Autoregressive (AI Glossary)
What 'autoregressive' means in AI — generating one token at a time.
Validators & Checkers
All
Palette Colour-Blindness Safe Checker
Paste a palette and see which colour pairs become indistinguishable across 8 colour-vision-deficiency types.
Accessible Name Computer
Paste an interactive element and compute the name a screen reader will announce
Age Verification & Date-of-Birth Calculator
Calculate exact age from a DOB and verify against jurisdiction-specific age thresholds
Alt Text Length & Quality Checker
Paste HTML and flag images with missing, empty, or oversized alt attributes
Animation Frame-Rate & Flash Risk Estimator
Paste a CSS keyframe animation and estimate flash frequency for seizure safety
ARIA Live Region Debugger
Paste HTML and validate aria-live, aria-atomic and aria-relevant on dynamic regions
ARIA Role Reference & Attribute Validator
Look up any WAI-ARIA role and validate required/permitted attributes locally
autocomplete Attribute Validator
Paste a form and verify input autocomplete values are valid WCAG 1.3.5 tokens
Colour Contrast Live Preview
Type two hex codes and see a live text + button preview alongside the WCAG contrast ratio.
Gradient Text Accessibility Checker
Analyse contrast across a CSS gradient background to find failing text regions
Colour Name to Hex / RGBA Converter
Convert CSS named colours, Tailwind classes, and hex to every colour space
Consent Withdrawal Flow Checker
Assess whether your consent withdrawal is as easy as granting it (GDPR Art. 7.3).
Contrast Matrix Generator
Paste a palette and get an NxN WCAG contrast-ratio grid for every colour pair
Dark Mode Contrast Tester
Check that your colour pairs meet WCAG in both light and dark themes simultaneously
Data Retention Period Calculator
Calculate the earliest lawful deletion date for any data category under GDPR and more
Diceware Passphrase Generator
Generate cryptographically random passphrases from a word list, fully offline
File Metadata Scrubber
Strip author, company, and revision data from DOCX, XLSX, and PPTX files
Focus-Indicator Contrast Checker
Verify your CSS focus ring meets the WCAG 2.2 SC 1.4.11 minimum 3:1 contrast.
Font Size to rem Accessibility Converter
Convert px to rem and verify text scales with browser zoom to WCAG 1.4.4
Form Label & Accessible-Name Checker
Paste a form and detect every input, select or textarea missing an associated label or accessible name.
GDPR 72-Hour Breach Notification Countdown Timer
Start the GDPR 72-hour ICO notification clock from the moment of discovery
Local File Hash Generator (SHA-256/SHA-1/MD5)
Drop any file and compute its SHA-256, SHA-1, and MD5 checksums entirely in-browser
Heading Order Checker
Paste HTML and visualise the heading hierarchy with skipped-level warnings.
Have I Been Pwned — k-Anonymity Breach Checker
Check if your password appeared in a data breach using only a hash prefix
Icon-Only Button Accessible-Name Checker
Paste HTML to detect icon-only buttons missing an accessible name
Images-of-Text Detector
Paste HTML and flag img and background-image elements that likely encode text under WCAG 1.4.5.
Security Incident Severity Calculator
Score a security incident across impact, exploitability, and urgency for triage
lang Attribute Checker
Validate that HTML documents and inline elements have correct BCP 47 lang values
Large Text Contrast Checker
Verify contrast for 18pt+ and 14pt-bold text using relaxed WCAG thresholds
Link Text Quality Checker
Paste HTML and flag ambiguous link text like click here and read more.
Logical Focus Order Checker
Paste HTML and highlight modals, drawers, and widgets that may trap or lose focus.
Motion & Animation Safety Checker
Paste CSS and flag animations that may trigger vestibular disorders or seizures
Password Strength & Entropy Meter
Calculate real bit-entropy and crack time for any password — fully offline
Phishing URL Heuristic Checker
Score any URL for phishing risk using 15 local heuristics — no cloud lookup
QR Code Safety Inspector
Decode a QR code image and show the embedded URL before you open it
Visual vs DOM Reading-Order Checker
Paste CSS flexbox or grid and flag visual order diverging from DOM order
Reflow Viewport Width Checker
Test whether your content layout works at 320 CSS px width (WCAG 1.4.10)
Required Field Indicator Checker
Verify required form fields are indicated in text, not just colour (WCAG 1.3.3)
Screenshot & Image Metadata Viewer
Read EXIF, IPTC, and XMP metadata from any image without uploading it anywhere
Semantic HTML Auditor
Paste HTML and flag div-soup, missing landmarks, fake buttons and broken heading outlines.
Sensitive File Path Exposure Checker
Paste a list of server paths and flag ones that expose config, backups, or .git
Skip-Link Validator
Paste your HTML and verify that a working skip-to-content link is present, targeted and keyboard-reachable.
SVG Accessibility Checker
Paste inline SVG and verify title, desc, role and aria-labelledby presence
Tab-Order Visualizer
Paste HTML and see the keyboard focus sequence numbered in document order.
Table Header & Scope Checker
Validate that your HTML tables have th elements with correct scope attributes.
TOTP Token Generator (Offline)
Generate time-based OTP codes from a secret key entirely offline in your browser.
Touch-Target Size Checker
Enter width and height in CSS units and check against the 44x44 px WCAG 2.5.5 minimum.
URL Privacy & Fingerprinting Risk Checker
Analyse a URL for embedded identifiers, tracking tokens, and fingerprinting signals
URL Unshortener & Redirect Tracer
Follow every redirect hop for bit.ly, t.co and custom shorteners — no click needed
WAI-ARIA Authoring Practices Pattern Reference
Browse the official ARIA design patterns (dialog, combobox, tabs, etc.) offline
WCAG 2.1 Self-Audit Checklist
Walk through every WCAG 2.1 Level A and AA success criterion with pass/fail tracking saved locally.
WCAG-Accessible Colour Palette Suggestor
Enter a brand colour and get AA-compliant text colours auto-generated
Argentina CUIT/CUIL Validator
Validate Argentine tax and labor identity numbers (CUIT/CUIL)
aria-describedby & aria-details Validator
Paste HTML and verify that all aria-describedby references resolve to real IDs
Australia ABN Validator
Validate Australian Business Numbers with the ABR check algorithm
Australia ACN Validator
Validate Australian Company Numbers with the ASIC check digit
Austria PLZ Validator
Validate an Austrian 4-digit Postleitzahl and map it to its Bundesland
Austria UID Number Validator
Validate Austrian VAT (UID) numbers with the official check rule
Bangladesh e-TIN Validator
Validate Bangladeshi National Board of Revenue e-TIN numbers (12 digits)
Belgium National Register Number Validator
Validate a Belgian rijksregisternummer with the modulo-97 check.
Belgium VAT Number Validator
Validate a Belgian TVA/BTW number (BE + 10 digits) with mod-97.
Brazil CEP Postal Code Validator
Validate Brazilian CEP postal codes format and region
Brazil PIS/PASEP Validator
Validate Brazilian PIS and PASEP worker-identification numbers
Canada Business Number Validator
Validate Canadian 9-digit BN used for GST/HST registration
China Resident ID Card Validator
Validate Chinese 18-digit resident identity card numbers
China Mobile Number Validator
Validate an 11-digit Chinese mobile number and identify its carrier
China Postal Code Validator
Validate Chinese 6-digit postal codes by province prefix
China Unified Social Credit Code Validator
Validate Chinese 18-character USCC with the GB 32100 check character
Colour Temperature & Night-Mode Accessibility Checker
Check whether warm-tinted night-mode colours still meet WCAG contrast
WCAG Contrast Ratio Algorithm Tester
Step through the WCAG 2.x relative luminance formula with full intermediate values shown
CVE CVSS v3.1 Severity Calculator
Score a vulnerability using the full CVSS v3.1 formula and get the severity label.
Czech DIČ (VAT) Validator
Validate a Czech VAT identification number (DIČ) for entities and natural persons.
Czech PSČ Postal Code Validator
Validate a Czech 5-digit PSČ and map its prefix to a postal region
Czech Rodné číslo Validator
Validate a Czech national birth number (rodné číslo) and decode its date and sex.
Denmark CVR Validator
Validate Danish company registration numbers (CVR)
Denmark Postnummer Validator
Validate a Danish 4-digit postnummer and map it to its region
Denmark VAT Number Validator
Validate Danish momsregistreringsnummer (DK prefix + 8-digit CVR)
Ethiopia TIN Validator
Validate Ethiopian Revenue and Customs Authority (ERCA) TIN format
Finland VAT Number Validator
Validate Finnish arvonlisaveronumero (FI prefix + 8-digit Y-tunnus)
Finland Y-tunnus Validator
Validate Finnish business ID (Y-tunnus) with modulus check
France Postal Code Validator
Validate a French 5-digit code postal and map it to its département
France SIREN Validator
Validate a 9-digit French SIREN company number with the Luhn algorithm
France SIRET Validator
Validate a 14-digit French SIRET establishment code with the Luhn algorithm
France VAT Number Validator
Validate a French numéro de TVA: FR prefix, 2-digit key and SIREN
Germany PLZ Postal Code Validator
Validate German 5-digit Postleitzahlen and map them to a federal state
Germany VAT Number Validator
Validate a German USt-IdNr (DE + 9 digits) with the MOD-11,10 check
Ghana TIN Validator
Validate Ghanaian GRA Tax Identification Numbers (Ghana Card PIN format).
Greece AFM Tax Number Validator
Validate a Greek taxpayer number (ΑΦΜ) with the modulus-11 check
Greece VAT Number Validator
Validate a Greek EL VAT number (EL + 9-digit AFM)
BCP 47 Language Tag Lookup & Validator
Validate and look up BCP 47 language tags for the HTML lang attribute
Hungary TAJ Number Validator
Validate a Hungarian social security (TAJ) number with the weighted mod-10 check.
Hungary VAT Number Validator
Validate a Hungarian ÁFA / ANUM VAT number (HU + 8 digits).
India GSTIN Validator
Validate Indian GST Identification Numbers with check digit
India IFSC Code Validator
Validate Indian Financial System Codes (IFSC) for NEFT, RTGS and IMPS bank routing.
India Mobile Number Validator
Validate Indian 10-digit mobile numbers and detect the access provider
Indonesia NIK Validator
Validate the 16-digit Indonesian national ID (NIK) and decode its fields.
Ireland VAT Number Validator
Validate Irish VAT numbers in all four known formats with the mod-23 check letter.
Israel ID Number (ת.ז.) Validator
Validate a 9-digit Israeli identity number (Teudat Zehut) with the Luhn check digit.
Israel VAT Number Validator
Validate an Israeli VAT / company number (עוסק מורשה) with the official check-digit rule.
Italy Partita IVA Validator
Validate Italian VAT numbers with the official Luhn-variant check
Italy CAP Postal Code Validator
Validate Italian CAP codes and map them to a postal area
Japan Corporate Number Validator
Validate Japanese 13-digit corporate number (法人番号)
Japan My Number Validator
Validate Japanese individual number (My Number) check digit
Japan Phone Number Validator
Validate Japanese fixed-line, mobile (keitai) and IP phone numbers
Kenya KRA PIN Validator
Validate a Kenya Revenue Authority PIN — letter, 9 digits, letter format.
Keyboard Shortcut Conflict Checker (WCAG 2.5.4)
List your app's keyboard shortcuts and flag conflicts with AT and browser defaults
Landmark Region Completeness Checker
Paste HTML and verify your page has the required ARIA landmark regions
Markdown Accessibility Checker
Paste Markdown and flag empty alt text, skipped headings, and bare URLs
Mexico Phone Number Validator
Validate Mexican 10-digit numbers: 2 or 3-digit LADA plus local
Mexico Postal Code Validator
Validate Mexican 5-digit códigos postales by state prefix
Mexico RFC Validator
Validate Mexican RFC for individuals and companies
Netherlands KvK Number Validator
Validate Dutch Chamber of Commerce numbers with the 11-proef
Netherlands Postal Code Validator
Validate a Dutch postcode in the 4-digit + 2-letter NNNN AA format.
Netherlands VAT Number Validator
Validate a Dutch BTW-nummer: NL + 9 digits + B + 2-digit suffix.
Nigeria TIN Validator
Validate Nigerian Tax Identification Numbers (FIRS/JTB format).
Norway MVA (VAT) Number Validator
Validate Norwegian momsregistreringsnummer (9-digit org number + MVA)
Norway Organisasjonsnummer Validator
Validate Norwegian 9-digit company numbers with weighted modulus-11
Norway Postnummer Validator
Validate a Norwegian 4-digit postnummer and map it to its region
Open Graph Tag Privacy Auditor
Paste HTML head tags and flag OG or Twitter card data that may over-expose content
OWASP Top 10 Self-Audit Checklist
Walk through all 10 OWASP 2021 categories with per-item pass and fail tracking
Pakistan NTN Validator
Validate Pakistani National Tax Numbers issued by FBR — format and check digit
Password Manager Readiness Checker
Paste a login form and check if it is correctly structured for password manager autofill.
Password Policy Compliance Tester
Define a password policy and test candidate passwords against every rule
Peru RUC Validator
Validate a Peruvian tax registration code (RUC) with the SUNAT mod-11 check digit.
Philippines SSS Number Validator
Validate Philippine Social Security System numbers (format + Luhn check)
Poland NIP Validator
Validate a Polish tax identification number (NIP) with the weighted mod-11 check digit.
Poland Postal Code Validator
Validate a Polish NN-NNN kod pocztowy and map it to a voivodeship
Poland REGON Validator
Validate a Polish statistical business number (REGON, 9 or 14 digits).
Portugal IBAN Validator
Validate a Portuguese IBAN (PT50 + 21 chars) with MOD-97
robots.txt Privacy Auditor
Paste a robots.txt and check AI crawler rules and accidental path exposure
Romania CIF/CUI Validator
Validate Romanian company tax codes (CIF/CUI) with the official ANAF check digit.
Russia Postal Code Validator
Validate a Russian 6-digit индекс and map it to a federal subject
Russia SNILS Validator
Validate an 11-digit Russian pension insurance number (СНИЛС) with its checksum.
Saudi National ID Validator
Validate Saudi national identity numbers with the Luhn check digit
Saudi Arabia VAT Number Validator
Validate Saudi ZATCA VAT registration numbers (15 digits)
Screen Reader Announcement Simulator
Paste HTML and preview what JAWS or NVDA would announce per element
Session Timeout UX & Security Calculator
Calculate the optimal session timeout for a given risk level and user context.
Singapore NRIC/FIN Validator
Validate Singapore NRIC (S/T) and FIN (F/G/M) with the official weighted check
Singapore UEN Validator
Validate Singapore Unique Entity Numbers (Business, Company and Others).
Sitemap Privacy Auditor
Paste a sitemap.xml and flag URLs that expose user IDs, tokens, or internal paths
Slovakia Rodné číslo Validator
Validate a Slovak national ID (rodné číslo) — shared rules with the Czech birth number.
South Africa ID Number Validator
Validate a South African 13-digit ID number with the Luhn check digit.
South Africa VAT Number Validator
Validate a South African VAT vendor number — 10 digits starting with 4 plus Luhn.
South Korea Business Registration Number Validator
Validate Korean 10-digit business registration numbers (BRN)
Spain NIF/NIE Validator
Validate a Spanish NIF or NIE with the official modulo-23 letter table
Spain VAT Number Validator
Validate Spanish IVA numbers (ESX format) in full
Sri Lanka NIC Validator
Validate Sri Lankan old 9-char and new 12-digit NIC formats
Subdomain Naming Security Checker
Paste a list of your subdomains and flag ones that hint at sensitive internal services.
Sweden Organisationsnummer Validator
Validate a Swedish company registration number with the Luhn check.
Sweden Postnummer Validator
Validate Swedish 5-digit postal codes and map them to regions
Sweden VAT Number Validator
Validate a Swedish momsregistreringsnummer (SE + 12 digits).
Switzerland PLZ Validator
Validate a Swiss 4-digit Postleitzahl and map it to its canton zone
Switzerland UID Validator
Validate Swiss company identification number (UID / CHE)
Text Spacing Override Tester (WCAG 1.4.12)
Preview copy with WCAG 1.4.12 maximum text-spacing overrides applied
Thailand National ID Validator
Validate a Thai 13-digit national ID with the official mod-11 check digit.
Thailand Tax ID Validator
Validate Thai Revenue Department taxpayer IDs (13-digit check digit)
Turkey T.C. Kimlik No Validator
Validate an 11-digit Turkish national identity number (TCKN) with the official two-check-digit rule.
Turkey Vergi Kimlik No Validator
Validate a 10-digit Turkish taxpayer number (VKN) with the official check-digit algorithm.
UAE Tax Registration Number Validator
Validate UAE Federal Tax Authority TRN numbers (15 digits)
UK National Insurance Number Validator
Validate UK NINO format including the official reserved-prefix rules.
UK Sort Code Validator
Validate UK bank sort codes and identify the issuing bank.
UK UTR (Tax Reference) Validator
Validate UK Unique Taxpayer Reference numbers with the HMRC check digit.
Ukraine IPN (РНОКПП) Validator
Validate a 10-digit Ukrainian individual tax number (РНОКПП / ІПН) with its check digit.
US EIN Validator
Validate US Employer Identification Numbers by IRS prefix rules.
US ITIN Validator
Validate IRS Individual Taxpayer Identification Numbers.
US ABA Routing Number Validator
Validate US bank routing numbers with the ABA checksum
US Social Security Number Validator
Validate US SSN format and detect known-invalid patterns.
vCard Validator
Check VCF files for RFC 6350 compliance and highlight missing fields
Vietnam Citizen ID (CCCD) Validator
Validate Vietnamese 12-digit Citizen Identification Card numbers
Vietnam MST (Tax Code) Validator
Validate Vietnamese tax codes for enterprises and branches
Modal Dialog ARIA Pattern Checker
Paste a modal dialog HTML snippet and verify the required ARIA attributes
WCAG 2.2 New Criteria Checker
Paste HTML and check for the 6 new success criteria added in WCAG 2.2
WCAG Mobile Accessibility Checklist
Step through 40 mobile-specific WCAG and MWBP checks with pass/fail tracking.
HTML Parsing & ID Uniqueness Checker (WCAG 4.1.1)
Paste HTML and find duplicate IDs and nesting problems that break ARIA references
WCAG 2.1 Success Criteria Search
Search WCAG 2.1 A and AA success criteria by keyword or number
Albania NUIS Validator
Validate Albanian business tax numbers (NUIS / NIPT) — letter + 8 digits + letter.
Algeria NIF Validator
Validate the 15-digit Algerian fiscal identification number (NIF).
Armenia HVHH (Tax Code) Validator
Validate Armenian HVHH taxpayer numbers used by the State Revenue Committee.
Armenia Social Security Number Validator
Validate the format of an Armenian 10-digit social ID (ՀԾՀ / SSN)
Australia ABN/ACN Cross-Reference Tool
Derive the ACN from an ABN and verify both checksums for Australian companies
Australia Number Plate Format Validator
Validate Australian state-specific plate formats (8 state/territory rules)
Azerbaijan PIN Validator
Validate the format of an Azerbaijani FIN (7-character personal ID)
Belarus UNP Validator
Validate a 9-character Belarusian UNP taxpayer number (modulo-11).
BIC/SWIFT Code Validator
Validate an 8 or 11-character SWIFT BIC against ISO 9362 structure rules
BIP39 Mnemonic Checksum Validator
Validate a 12/24-word BIP39 seed phrase checksum entirely client-side
BIP44/49/84 Derivation Path Explainer
Decode or build a BIP44/49/84/86 HD wallet derivation path for any coin
EVM Transaction Calldata Decoder
Decode Ethereum transaction calldata into function name and parameters
Bolivia NIT Validator
Validate Bolivian NIT (Número de Identificación Tributaria)
Bosnia and Herzegovina JIB Validator
Validate the Bosnian company tax number (JIB) with the ISO 7064 MOD 11,10 check.
Brazil Vehicle Plate Validator
Validate Brazilian Mercosul (ABC1D23) and old (ABC-1234) plate formats and convert between them.
Bitcoin Address Format Validator
Validate BTC addresses: P2PKH (1...), P2SH (3...), Bech32 (bc1...) and Bech32m
Content Security Policy (CSP) Header Strength Checker
Evaluate a CSP header string for security level and common misconfigurations
Cyprus TIC Validator
Validate a Cypriot Tax Identification Code with its mod-26 check letter
Denmark CVR Number Validator (Business)
Validate Danish CVR company registration for Nemhandel e-invoicing.
Ecuador RUC Validator
Validate Ecuadorian RUC for natural persons, companies, and public entities
EIP-55 Checksum Address Validator
Validate and checksumify Ethereum addresses per EIP-55
ENS Namehash Calculator
Compute the ENS namehash (EIP-137) for any .eth domain client-side
Ethereum Address Format Validator
Check ETH address format, EIP-55 checksum, and ENS name format validity
EU VAT Number Multi-Country Validator
Paste any EU VAT number and automatically detect country + validate
France Vehicle Plate (SIV) Validator
Validate French 2009 SIV plates in the AA-123-AA national format.
Georgia (Country) Personal Number Validator
Validate the format of a Georgian 11-digit personal number
Georgia (Country) VAT Payer Number Validator
Validate the Georgian taxpayer identification number (TIN) from the Revenue Service.
Germany Kfz-Kennzeichen Validator
Validate German vehicle plates and identify the issuing Zulassungsbezirk district.
Germany Kündigungsfristen Calculator
Calculate German statutory notice periods under BGB §622 by length of service.
Austria IBAN Validator
Validate Austrian IBANs (AT + 18 chars) with bank and account breakdown
Bahrain IBAN Validator
Validate Bahraini IBANs (BH, 22 characters) with a 4-letter bank code and MOD-97 checksum.
Belgium IBAN Validator
Validate Belgian IBANs (BE + 16 chars) with the national mod-97 check
IBAN to BIC Lookup Tool
Derive the BIC/SWIFT code from any valid IBAN using a bundled multi-country bank registry.
Croatia IBAN Validator
Validate Croatian IBANs (HR + 19 digits) with MOD-97 and ISO 7064 MOD 11,10 bank and account checks.
Cyprus IBAN Validator
Validate Cypriot IBANs (CY, 28 characters) with a 3-digit bank code and 5-digit branch code.
Czech IBAN Validator
Validate Czech IBANs (CZ + 22 digits) with MOD-97 and the bank's modulo-11 account checks.
Denmark IBAN Validator
Validate Danish IBANs (DK + 16 chars) with registration number split
Finland IBAN Validator
Validate Finnish IBANs (FI, 18 characters) with a 3-digit bank group and MOD-97 checksum.
France IBAN Validator
Validate French IBANs (FR + 27 chars) with MOD-97 and Clé RIB check
Germany IBAN Validator
Validate German IBANs (DE + 22 chars) with MOD-97 and BBAN check
Greece IBAN Validator
Validate Greek IBANs (GR + 25 chars) with bank and branch codes
Hungary IBAN Validator
Validate Hungarian IBANs (HU + 26 digits) with MOD-97 and two national modulo-10 check digits.
Ireland IBAN Validator
Validate Irish IBANs (IE + 20 chars) with BIC, sort code and account split
Israel IBAN Validator
Validate Israeli IBANs (IL + 21 digits) with bank and branch codes and the MOD-97 checksum.
Italy IBAN Validator
Validate Italian IBANs (IT + 27 chars) including the CIN letter
Jordan IBAN Validator
Validate Jordanian IBANs (JO, 30 characters) with a 4-letter bank code and MOD-97 checksum.
Kuwait IBAN Validator
Validate Kuwaiti IBANs (KW, 30 characters) with a 4-letter bank code and MOD-97 checksum.
Luxembourg IBAN Validator
Validate Luxembourg IBANs (LU, 20 characters) with a 3-digit bank code and MOD-97 checksum.
Malta IBAN Validator
Validate Maltese IBANs (MT, 31 characters) with a 4-letter bank code and 5-digit sort code.
IBAN Multi-Country Validator
Validate any IBAN from 79 SWIFT-registered countries in one tool
Netherlands IBAN Validator
Validate Dutch IBANs (NL + 18 chars) with 4-letter bank code
Norway IBAN Validator
Validate Norwegian IBANs (NO + 13 chars) with the national MOD-11 check
Poland IBAN Validator
Validate Polish IBANs (PL + 26 chars) with NRB routing and account split
Portugal IBAN Validator
Validate Portuguese IBANs (PT50 + 21 chars) with bank, branch and NIB split
Romania IBAN Validator
Validate Romanian IBANs (RO + 22 chars) with a 4-letter bank code and MOD-97 checksum.
Saudi Arabia IBAN Validator
Validate Saudi IBANs (SA + 22 chars) with a 2-digit bank code and the MOD-97 checksum.
Spain IBAN Validator
Validate Spanish IBANs (ES + 24 chars) with CCC check digits
Sweden IBAN Validator
Validate Swedish IBANs (SE + 22 chars) with clearing code and account split
Switzerland IBAN Validator
Validate Swiss IBANs (CH + 21 chars) with the 5-digit IID and account
Turkey IBAN Validator
Validate Turkish IBANs (TR + 24 chars) with a 5-digit bank code, reserve digit, and MOD-97.
UAE IBAN Validator
Validate UAE IBANs (AE + 21 digits) with a 3-digit bank code and the MOD-97 checksum.
UK IBAN Validator
Validate British IBANs (GB + 22 chars) with sort code and account
India Vehicle Registration Validator
Validate Indian plates by state and series in the SS 00 LL 0000 format.
Iran National ID (Kod Melli) Validator
Validate an Iranian national identity code with the modulo-11 check.
Iraq National ID Validator
Validate the 12-digit Iraqi national identification number format.
Kazakhstan BIN/IIN Validator
Validate a 12-digit Kazakh BIN or IIN and decode its structure.
Latvia Personas Kods Validator
Validate Latvian personal codes — old DDMMYY checksum and new 32-series
Liechtenstein UID Validator
Validate Liechtenstein company UID numbers using the shared Swiss CHE algorithm
Malta VAT Number Validator
Validate Maltese VAT numbers with the official modulo-37 checksum
Mexico License Plate Format Validator
Validate Mexican vehicle plates across the 3+3, Mexico City 3+4, and 2023 federal formats.
Moldova IDNO Validator
Validate the Moldovan company fiscal code (IDNO) with its 7-3-1 check digit.
Morocco ICE Validator
Validate a 15-digit Moroccan ICE (Identifiant Commun de l'Entreprise).
New Zealand NZBN Validator
Validate 13-digit New Zealand Business Numbers with the GS1 mod-10 check
North Macedonia EMBS Validator
Validate the Macedonian company registration number (ЕМБС) with a modulo-11 check.
Paraguay RUC Validator
Validate Paraguayan RUC with the SET check-digit rule
Poland VAT Number Validator
Validate Polish NIP-based VAT numbers (PL + 10-digit NIP) with the modulo-11 check.
Slovakia DIČ (VAT) Validator
Validate a Slovak DIČ / IČ DPH number with the official mod-11 rule
Slovenia DDV-ID Validator
Validate Slovenian VAT numbers (SI + 8 digits) with the modulo-11 check digit.
South Africa Postal Code Validator
Validate South African 4-digit postal codes by province range
Sweden F-skatt Number Validator
Validate the personnummer or organisationsnummer behind a Swedish F-skatt approval
Tunisia CIN Validator
Validate the 8-digit Tunisian national identity card (CIN) number.
Turkey Postal Code Validator
Validate Turkish 5-digit posta kodu and map them to provinces
UK Companies House Number Validator
Validate UK company registration numbers across all jurisdictions and entity types
UK Vehicle Registration Plate Validator
Validate UK number plates across suffix, prefix, and current styles, and decode region and year.
Ukraine EDRPOU Validator
Validate an 8-digit Ukrainian EDRPOU with the modulo-11 control digit.
Ukraine Postal Code Validator
Validate Ukrainian 5-digit postal codes and map them to oblasts
Uruguay RUT Validator
Validate Uruguayan RUT (Registro Único Tributario) with DGI modulus
US ABA Routing Number Validator (Bank Identified)
Validate a 9-digit ABA routing number and identify the institution
Venezuela RIF Validator
Validate Venezuelan RIF tax registration numbers (V/E/J/G/C prefix)
VIN Check Digit Validator
Verify a 17-character VIN check digit (position 9) using the NHTSA algorithm
Tax & Payroll
All
Argentina Ganancias Income Tax Calculator
Calculate Argentine Ganancias for employees with the Art. 94 scale
Australia Income Tax Calculator
Calculate Australian PAYG income tax with the Medicare levy
Austria Income Tax Calculator
Calculate Austrian Einkommensteuer across seven progressive brackets
Belgium Income Tax Calculator
Estimate Belgian personenbelasting plus the regional/municipal surcharge.
Brazil Income Tax Calculator
Calculate Brazilian IRPF income tax bands for individuals
British Columbia Income Tax Calculator
Calculate BC provincial income tax across 7 brackets
Canada Federal Income Tax Calculator
Calculate Canadian federal income tax across all brackets
Ontario Provincial Income Tax Calculator
Calculate Ontario surtax, basic personal credit, and provincial rates
Quebec Income Tax Calculator
Calculate Quebec provincial income tax with QPP instead of CPP
Chile Impuesto Único Calculator
Calculate Chilean IUSC second-category employment income tax
China Individual Income Tax Calculator
Calculate Chinese IIT with 7-bracket progressive rates and special deductions
Denmark Income Tax Calculator
Calculate Danish bundskat + topskat + AM-bidrag
Finland Income Tax Calculator
Calculate Finnish state income tax + municipal + YEL for self-employed
France Income Tax Calculator
Estimate French impôt sur le revenu with the quotient familial system
Germany Income Tax Calculator
Calculate German Einkommensteuer, Soli, and Kirchensteuer
Ghana PAYE Income Tax Calculator
Calculate Ghanaian PAYE with the GRA chargeable income bands.
India Income Tax Calculator
Calculate Indian income tax under old and new regimes
Indonesia PPh 21 Calculator
Calculate Indonesian PPh 21 income tax with PTKP and progressive brackets.
Ireland Income Tax Calculator
Estimate Irish PAYE, USC, and PRSI to see your take-home pay for 2025.
Italy IRPEF Income Tax Calculator
Estimate Italian IRPEF using the four national tax bands
Japan Income Tax Calculator
Estimate Japanese national income tax with deductions and the 2.1% surtax
Kenya PAYE Income Tax Calculator
Calculate Kenyan PAYE with current KRA bands and personal relief.
Malaysia Income Tax Calculator
Calculate Malaysian resident income tax with LHDN's 13 progressive brackets.
Mexico ISR Income Tax Calculator
Calculate Mexican ISR annual income tax by bracket
Netherlands Income Tax Calculator
Estimate Dutch inkomstenbelasting across box 1, box 2 and box 3.
New Zealand Income Tax Calculator
Calculate NZ PAYE, ACC earner levy, and student-loan repayments
Nigeria PAYE Calculator
Calculate Nigerian PAYE using the PITA Consolidated Relief Allowance.
Norway Income Tax Calculator
Calculate Norwegian trinnskatt + flat tax on personal income
Poland PIT Income Tax Calculator
Estimate Polish PIT-36 / PIT-37 income tax with the two-band scale and tax-free amount.
Portugal IRS Income Tax Calculator
Calculate Portuguese IRS with nine brackets and family splitting
Singapore Income Tax Calculator
Calculate Singapore resident income tax with IRAS's 11-bracket progressive rates.
South Africa Income Tax Calculator
Estimate SARS PAYE with age rebates, medical credits, and the UIF cap.
South Korea Income Tax Calculator
Calculate Korean earned-income tax with 8 brackets and the earned-income deduction
Spain IRPF Income Tax Calculator
Estimate Spanish IRPF using the national progressive brackets
Sweden Income Tax Calculator
Calculate Swedish kommunalskatt + statlig skatt on employment income
Switzerland Income Tax Estimator
Estimate Swiss federal direct tax plus cantonal rates by canton
Thailand Personal Income Tax Calculator
Calculate Thai PIT with 8 progressive brackets and the employment deduction
Turkey Gelir Vergisi Calculator
Estimate Turkish progressive income tax across the five GVK brackets (15–40%).
UK Income Tax & NI Calculator
Calculate UK PAYE income tax and National Insurance on your salary.
Scotland Income Tax Calculator
Calculate Scottish PAYE using Scotland's six unique income-tax bands.
California State Income Tax Calculator
Calculate CA state income tax including SDI and the 1% mental-health surcharge.
US Federal Income Tax Calculator
Estimate US federal income tax for single and married filers.
Illinois State Income Tax Calculator
Calculate Illinois flat-rate 4.95% state income tax
New York State Income Tax Calculator
Calculate NY state plus NYC city income tax combined.
Ohio State Income Tax Calculator
Calculate Ohio graduated income tax with municipal add-on
Pennsylvania State Income Tax Calculator
Calculate PA flat 3.07% income tax + local EIT
Australia Customs Duty Calculator
Calculate Australian customs duty and GST for imports above AU$1,000
Australia NSW Payroll Tax Calculator
Calculate NSW employer payroll tax on wages above the threshold
Australia NSW Stamp Duty Calculator
Calculate NSW stamp duty (transfer duty) on residential property
Australia VIC Stamp Duty Calculator
Calculate Victorian stamp duty with principal-place-of-residence concession
Australia VIC Payroll Tax Calculator
Calculate Victorian employer payroll tax rate and threshold
Brazil ICMS/PIS/COFINS Rate Calculator
Estimate Brazilian indirect taxes (ICMS, PIS, COFINS) on a price
Brazil Simples Nacional Tax Calculator
Calculate the Simples Nacional effective rate and DAS for micro and small enterprises
Alberta Provincial Income Tax Calculator
Calculate Alberta's 10% base provincial income tax
Canada GST/HST/PST Calculator by Province
Calculate Canadian GST, HST, PST and QST by province in both directions.
Czech Republic Income Tax Calculator
Calculate Czech daň z příjmů with 15 percent rate and 23 percent surcharge
EU Digital Services OSS Threshold Checker
Check if your cross-border EU digital B2C sales require OSS VAT registration
EU Import VAT Calculator
Calculate EU import VAT and customs duty for cross-border parcels
EU VAT Rate Lookup
Look up standard, reduced, and super-reduced VAT rates for all EU27
France Crédit d'Impôt Recherche (CIR) Calculator
Calculate the French R&D tax credit at 30% up to €100M and 5% above
France Droits de Succession Calculator
Calculate French inheritance tax by heir relationship and share
France Franchise en Base de TVA Threshold Checker
Check if your French micro-business stays below the TVA franchise limits
France Plus-Value Immobilière Calculator
Calculate French capital gain tax on property with tenure abatement
Germany Erbschaftsteuer Calculator
Calculate German inheritance tax by Steuerklasse and allowance
Germany Grunderwerbsteuer Calculator
Calculate German real estate transfer tax by Bundesland (3.5%–6.5%)
Germany Kleinunternehmer Threshold Checker
Check if you qualify for the German §19 UStG small-business VAT exemption
Global VAT/GST Rate Reference
Look up VAT/GST standard rates for 160+ countries
Hong Kong Property Rates Calculator
Calculate HK government rates at 5% of rateable value, with quarterly splits.
Hong Kong Salaries Tax Calculator
Calculate HK salaries tax under progressive or standard rate
Hungary SZJA Income Tax Calculator
Calculate Hungarian flat 15% personal income tax (SZJA) and take-home pay.
India Basic Customs Duty Calculator
Calculate Indian BCD, IGST, and social-welfare surcharge on imports
India Form 16 Tax Reconciliation Calculator
Verify TDS deducted on Form 16 against your actual tax liability
India GST Rate Calculator (CGST + SGST / IGST)
Calculate Indian GST and split it into CGST + SGST or IGST by supply type.
India TDS Calculator
Calculate TDS deduction rates for salary, rent, contractor and professional fees.
Luxembourg Income Tax Calculator
Calculate Luxembourg impôt sur le revenu with tax class 1, 1a or 2
Mexico RESICO Tax Calculator
Calculate Mexican RESICO-PF simplified trust-regime ISR for self-employed
Netherlands Mortgage Interest Deduction Calculator
Calculate Dutch hypotheekrenteaftrek with the annual phase-down cap.
NZ GST Registration Threshold Checker
Check if your NZ business must register for GST (NZ$60,000 turnover)
Russia NDFL Calculator
Calculate Russian personal income tax (NDFL) at the flat 13% / 15% rates.
Scotland LBTT Calculator
Calculate Scottish Land and Buildings Transaction Tax (LBTT)
Spain Plusvalía Municipal Calculator
Calculate Spanish local capital-gains tax on urban land (IIVTNU)
UK Capital Gains Tax Calculator
Estimate UK CGT on property and other assets after the allowance
UK Dividend Tax Calculator
Work out UK tax on dividends above the 500 GBP allowance
UK Import VAT Calculator
Calculate UK import VAT (20%) and customs duty for parcels above £135
UK Inheritance Tax Calculator
Calculate UK IHT with nil-rate band, RNRB, and the seven-year rule
UK P60 Income Reconciliation Calculator
Reconcile P60 gross pay and tax paid against HMRC PAYE rules
UK R&D SME Tax Relief Calculator
Calculate the merged-scheme RDEC credit and ERIS intensive relief for SMEs
UK Stamp Duty Land Tax (SDLT) Calculator
Calculate SDLT for England/NI property purchases including surcharges
UK VAT Registration Threshold Checker
Check if your UK business must register for VAT (£90,000 threshold)
Arizona State Income Tax Calculator
Calculate Arizona flat 2.5% income tax — one of the lowest in the US
Colorado State Income Tax Calculator
Calculate Colorado flat 4.4% income tax with the TABOR surplus refund
Connecticut State Income Tax Calculator
Calculate CT income tax with 7 brackets up to 6.99%
US Federal Estate Tax Calculator
Calculate US federal estate tax after the $13.99M exemption (2025)
Georgia State Income Tax Calculator
Calculate GA flat 5.49% income tax after the 2024 rate cut
Hawaii State Income Tax Calculator
Calculate Hawaii income tax with 12 brackets up to 11%
Idaho State Income Tax Calculator
Calculate Idaho flat 5.8% income tax rate (2024 simplified)
Maryland State Income Tax Calculator
Calculate MD state tax plus the county piggyback tax combined
Massachusetts Income Tax Calculator
Calculate MA flat 5% state income tax plus the 4% surtax over $1M
Michigan State Income Tax Calculator
Calculate Michigan 4.25% flat income tax plus city income taxes
Minnesota State Income Tax Calculator
Calculate Minnesota income tax with 4 progressive brackets
New Jersey State Income Tax Calculator
Calculate NJ graduated income tax with up to 8 brackets
North Carolina State Income Tax Calculator
Calculate NC flat 4.5% income tax with the 2024 reduced rate
Oregon State Income Tax Calculator
Calculate Oregon income tax with up to 9.9% top rate and Metro tax
US QBI Deduction Calculator (Section 199A)
Calculate the 20% qualified business income deduction for pass-through entities
US Sales Tax Nexus Checker
Check economic nexus thresholds for all 50 US states
Utah State Income Tax Calculator
Calculate Utah flat 4.65% income tax with credit-reduction mechanism
Virginia State Income Tax Calculator
Calculate Virginia graduated income tax up to 5.75% across 4 brackets
Wisconsin State Income Tax Calculator
Calculate Wisconsin income tax across 4 brackets
Wales LTT Calculator
Calculate Welsh Land Transaction Tax (LTT) with 2024 higher-rate bands
Albuquerque Combined Sales Tax Calculator
Compute exact Albuquerque city, county, and state gross receipts tax on any amount.
Albuquerque Hotel & Occupancy Tax Calculator
See your true Albuquerque hotel bill after 15.1875% occupancy taxes
Albuquerque Property Tax Estimator
Estimate your annual Albuquerque property tax at the local 0.73% rate
Atlanta Combined Sales Tax Calculator
Compute exact Atlanta city+county+state sales tax on any purchase amount.
Atlanta Hotel & Occupancy Tax Calculator
See your true Atlanta hotel bill after 16% occupancy taxes.
Atlanta Property Tax Estimator
Estimate your annual Atlanta property tax at the local 1.01% rate.
Austin Combined Sales Tax Calculator
Compute exact Austin city+county+state sales tax on any purchase amount.
Austin Hotel & Occupancy Tax Calculator
See your true Austin hotel bill after 15% occupancy taxes
Austin Property Tax Estimator
Estimate your annual Austin property tax at the local 1.97% rate.
Baltimore City Income Tax Calculator
Calculate your Baltimore local income tax on top of MD state and federal obligations
Baltimore Combined Sales Tax Calculator
Compute exact Baltimore city+county+state sales tax on any purchase amount.
Baltimore Hotel & Occupancy Tax Calculator
See your true Baltimore hotel bill after 15.5% occupancy taxes
Baltimore Property Tax Estimator
Estimate your annual Baltimore property tax at the local 1.55% rate.
Boston Combined Sales Tax Calculator
Compute Boston sales tax at the flat 6.25% Massachusetts rate
Boston Hotel & Occupancy Tax Calculator
See your true Boston hotel bill after 14.95% occupancy taxes
Boston Property Tax Estimator
Estimate annual Boston property tax at the local residential rate
Chicago Combined Sales Tax Calculator
Compute exact Chicago city, county, and Illinois state sales tax on any purchase
Chicago Hotel & Occupancy Tax Calculator
See your true Chicago hotel bill after the combined 17.4% occupancy tax.
Chicago Property Tax Estimator
Estimate annual Chicago property tax at the local effective rate
Denver Combined Sales Tax Calculator
Compute exact Denver city+county+state sales tax on any purchase amount.
Denver Hotel & Occupancy Tax Calculator
See your true Denver hotel bill after the 14.75% lodging tax stack
Denver Property Tax Estimator
Estimate annual Denver property tax from market value and assessment rate
Detroit City Income Tax Calculator
Calculate Detroit local income tax on top of Michigan and federal
Detroit Combined Sales Tax Calculator — Michigan 6% Rate
Compute exact Detroit sales tax on any purchase using Michigan's flat 6% rate with grocery and prescription exemptions.
Detroit Hotel & Occupancy Tax Calculator
See your true Detroit hotel bill after ~12% occupancy taxes
Detroit Property Tax Estimator
Estimate your annual Detroit property tax from assessed value and millage
Houston Combined Sales Tax Calculator
Compute exact Houston city + county + state sales tax on any purchase.
Houston Hotel & Occupancy Tax Calculator
See your true Houston hotel bill after 17% occupancy taxes
Houston Property Tax Estimator
Estimate annual Houston property tax at the local ~2.23% effective rate.
Las Vegas Combined Sales Tax Calculator
Compute exact Las Vegas city+county+state sales tax on any purchase
Las Vegas Hotel & Occupancy Tax Calculator — 13.38% Strip Rate
See your true Las Vegas hotel bill after 13.38% occupancy tax plus nightly resort fees.
Las Vegas Property Tax Estimator — Nevada 35% Assessment + 3% Cap
Estimate your annual Las Vegas property tax using Nevada's 35% assessment ratio and abatement cap.
Los Angeles Combined Sales Tax Calculator — 10.25% Rate
Compute exact Los Angeles city + county + state sales tax on any purchase amount.
Los Angeles Hotel & Occupancy Tax Calculator — 15.5%
See your true Los Angeles hotel bill after 15.5% occupancy taxes.
Los Angeles Property Tax Estimator — 0.73% Effective Rate
Estimate your annual Los Angeles property tax at the local 0.73% rate.
Louisville City Income Tax Calculator
Calculate your Louisville local income tax on top of KY state and federal obligations.
Louisville Combined Sales Tax Calculator
Compute exact Louisville sales tax on any purchase amount.
Louisville Hotel & Occupancy Tax Calculator
See your true Louisville hotel bill after 16.35% occupancy taxes.
Louisville Property Tax Estimator
Estimate your annual Louisville property tax at the local 0.91% rate.
Mesa Combined Sales Tax Calculator
Compute exact Mesa city+county+state sales tax on any purchase amount.
Miami Combined Sales Tax Calculator
Compute exact Miami city, county, and state sales tax on any purchase
Miami Hotel & Occupancy Tax Calculator
See your true Miami hotel bill after 14% occupancy taxes.
Miami Property Tax Estimator
Estimate your annual Miami property tax at the local 1.02% rate.
Milwaukee Combined Sales Tax Calculator
Compute exact Milwaukee city+county+state sales tax on any purchase amount
Milwaukee Hotel & Occupancy Tax Calculator
See your true Milwaukee hotel bill after roughly 17.5% in occupancy taxes.
Milwaukee Property Tax Estimator
Estimate your annual Milwaukee property tax at the local 2.17% effective rate.
Minneapolis Combined Sales Tax Calculator
Compute exact Minneapolis city+county+state sales tax on any purchase amount.
Minneapolis Hotel & Occupancy Tax Calculator
See your true Minneapolis hotel bill after layered occupancy taxes
Minneapolis Property Tax Estimator
Estimate your annual Minneapolis property tax at the local 1.12% rate.
Nashville Combined Sales Tax Calculator
Compute exact Nashville city + county + state sales tax on any amount
Nashville Hotel & Occupancy Tax Calculator
See your true Nashville hotel bill after occupancy taxes and fees.
Nashville Property Tax Estimator
Estimate annual Nashville property tax from your home's value.
New York City City Income Tax Calculator
Calculate your New York City local income tax on top of state and federal.
New York City Combined Sales Tax Calculator
Compute exact New York City city+county+state sales tax on any purchase
New York City Hotel & Occupancy Tax Calculator
See your true New York City hotel bill after 14.75% occupancy taxes.
New York City Property Tax Estimator
Estimate your annual New York City property tax at the local rate.
Philadelphia City Income Tax Calculator
Calculate the Philadelphia Wage Tax layered on top of PA state and federal.
Philadelphia Combined Sales Tax Calculator
Compute exact Philadelphia city+county+state sales tax on any purchase amount
Philadelphia Hotel & Occupancy Tax Calculator
See your true Philadelphia hotel bill after 16.25% occupancy taxes.
Philadelphia Property Tax Estimator
Estimate your annual Philadelphia property tax at the local 1.3998% rate.
Phoenix Combined Sales Tax Calculator
Compute exact Phoenix city+county+state sales tax on any purchase amount
Phoenix Hotel & Occupancy Tax Calculator
See your true Phoenix hotel bill after 12.57% occupancy taxes
Phoenix Property Tax Estimator
Estimate your annual Phoenix property tax at the local 0.66% rate
Portland Combined Sales Tax Calculator
Portland charges no general sales tax — see your exact final price
Portland Hotel & Occupancy Tax Calculator
See your true Portland hotel bill after 15.3% occupancy taxes
Portland Property Tax Estimator
Estimate annual Portland property tax from your assessed value
San Antonio Combined Sales Tax Calculator
Compute exact San Antonio city + county + state sales tax on any purchase.
San Antonio Hotel & Occupancy Tax Calculator
See your true San Antonio hotel bill after 16.75% occupancy taxes.
San Antonio Property Tax Estimator
Estimate your annual San Antonio property tax at the local 2.35% rate.
San Diego Combined Sales Tax Calculator
Compute exact San Diego city+county+state sales tax on any purchase amount.
San Diego Hotel & Occupancy Tax Calculator
See your true San Diego hotel bill after 12.5% occupancy tax
San Diego Property Tax Estimator
Estimate annual San Diego property tax at the local 0.74% rate
San Francisco Combined Sales Tax Calculator
Compute exact San Francisco city, county, and state sales tax on any amount
San Francisco Hotel & Occupancy Tax Calculator
See your real San Francisco hotel bill after the 14% transient occupancy tax
San Francisco Property Tax Estimator
Estimate your annual San Francisco property tax at the local effective rate
San Jose Combined Sales Tax Calculator
Compute exact San Jose state plus local sales tax on any amount
San Jose Hotel & Occupancy Tax Calculator
See your true San Jose hotel bill after the 10% transient occupancy tax
San Jose Property Tax Estimator
Estimate annual San Jose property tax at the local 0.73% rate
Seattle Combined Sales Tax Calculator
Compute exact Seattle city, county, and state sales tax on any purchase
Seattle Hotel & Occupancy Tax Calculator
See your true Seattle hotel bill after 15.6% occupancy taxes.
Seattle Property Tax Estimator
Estimate your annual Seattle property tax at the local 0.93% rate.
Tucson Property Tax Estimator
Estimate your annual Tucson property tax at the local effective rate.