More Calculators
706 free more calculators tools in the Calculators & Converters collection — every one runs in your browser with no signup and no uploads. Page 5 of 8.
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.
Phantom Power Cable Resistance Drop Calculator
Estimate phantom power voltage drop across XLR cable resistance
Phenytoin Dose Adjustment for Hypoalbuminaemia
Correct a phenytoin level for low albumin or renal failure.
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
Pipe Bevel & Saddle Layout Calculator
Generate the wrap-around cut template for pipe saddle and branch joints
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 Population & Row-Spacing Tool
Calculate plant population per acre from row spacing and in-row seed spacing
Plant Watering Interval Calculator
Calculate how often to water based on plant type, pot, and climate
Plasmid Insert Size Estimator
Predict gel band sizes from a restriction digest of a recombinant plasmid
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.
Plywood Sheet Optimizer
Lay out cut parts on the minimum number of sheets to cut cost and waste
Pet Pool / Paddling Pool Chemistry Calculator
Calculate chlorine and pH adjustment doses for a small pool
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
Postgraduate Entry Requirement Checker
Check if your undergraduate grade meets typical postgrad entry bars.
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
Powerlifting Attempt Selector
Choose your opening, second, and third attempts from your max
Powerlifting Competition Total Predictor
Predict your competition-day total from gym maxes.
IPF GL Points Calculator
Calculate IPF GL points for any powerlifting total.
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
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
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
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
RC Aircraft Wing Loading Calculator
Calculate wing loading and a stall-speed estimate for RC planes
REACH / RoHS Substance Checker
Check if your product is restricted under REACH or RoHS substance rules.
Rebar Spacing & Lap Splice Calculator
Find bar spacing and required lap-splice length per ACI 318
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
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
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
Reorder Point Calculator
Find the on-hand level that should trigger a replenishment order
Residential Optional Load Calculation (NEC 220.82)
Fast residential service sizing using the NEC 220.82 optional calculation method
Residential Mechanical Ventilation Calculator (ASHRAE 62.2)
Calculate whole-house ventilation CFM per ASHRAE 62.2 and IECC 2021
Resin Exposure Time Calculator
Get starting base and normal layer exposure times for SLA/MSLA resin
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
Reverb Room Size to Pre-Delay Calculator
Derive natural pre-delay from simulated room size and listener position
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
RMD Calculator
Calculate your 2026 IRS Required Minimum Distribution
Room Mode (Standing Wave) Calculator
Find axial, tangential, and oblique room modes for acoustic treatment.
Rowing 2K Time Predictor
Predict your 2K erg time from a longer rowing piece
Rowing Split-to-Watts Calculator
Convert any rowing split time to watts instantly.
RPM / SFM Calculator
Convert between spindle RPM and surface feet per minute for any cutter diameter
Safety Stock Calculator
Set buffer inventory from demand variability, lead time, and service level
SAT Reading & Writing Score Estimator
Estimate your SAT Reading and Writing score from correct answers
SAT Superscore Calculator
Calculate your SAT superscore across multiple test dates
SAT to ACT Score Conversion Calculator
Convert your SAT score to the equivalent ACT composite.
SCC Transfer Impact Assessment Tool
Assess third-country transfer risk for GDPR Standard Contractual Clauses
Custom School Grading Scale Builder
Build and test a custom grading scale for any institution.
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
Garden Seed Spacing & Row Calculator
Calculate how many plants fit in your garden bed by spacing
Self-Employment Tax Calculator (2026)
Calculate your 2026 SE tax on 1099 and freelance income
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
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 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
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 Import Duty & Customs Calculator
Estimate landed cost including Singapore import duties, VAT, and customs fees.
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
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
Soccer Expected Points from xG Calculator
Convert a match's xG totals to expected points for both teams
Soccer League Table Simulator
Simulate a league table from match results.
Soccer Offside Line Visual Aid
Understand offside decisions with a visual line tool
Soccer League Points Projection
Project a team's final points tally from their current form.
Soccer Possession Impact Calculator
Estimate the points impact of possession over a season
Soccer Expected Goals (xG) Calculator
Estimate the xG value of a shot based on position and type.
Social Security Benefit Estimator
Estimate your monthly Social Security retirement benefit
Hyponatraemia Correction Rate Calculator
Safe sodium correction speed to avoid osmotic demyelination.