Date & Time
81 free date & time tools in the Calculators & Converters collection — every one runs in your browser with no signup and no uploads.
Age Calculator
Your exact age in years, months and days — plus next-birthday countdown.
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
Boxing Reach Advantage Calculator
Calculate the reach advantage and guard implication between two boxers
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.
Demurrage & Detention Calculator
Calculate container demurrage and detention from free-time and daily rates
Dog Age in Human Years Calculator
Calculate your dog's equivalent human age by breed size
Duct Leakage Test Calculator
Calculate duct leakage from blower-door test results per ACCA Manual D and IECC 2021.
Frost Date Planting Schedule Calculator
Count back from last frost date to find indoor seed-starting dates
Golf Par-3 Iron Yardage Guide
Select the right iron for par-3 distances adjusted for conditions.
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
HVAC Tonnage Calculator
Convert a BTU/h cooling load to tons of refrigeration and size equipment to the nearest half-ton
Leverage Liquidation Price Calculator
Calculate liquidation price for long/short futures with cross or isolated margin
Lorcana Willpower & Lore Race Calculator
Track lore progress and calculate damage for Disney Lorcana
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
Resin Casting Shrinkage & Mold Size Calculator
Account for resin shrinkage when designing or ordering molds
Sample Freeze-Thaw Cycle Tracker
Log and limit freeze-thaw cycles for biological sample integrity
3D Print Shrinkage & Tolerance Calculator
Compensate for material shrinkage when designing tight-tolerance parts
DEX Slippage Calculator
Calculate expected slippage and minimum received on DEX token swaps
Garden Soil Drainage Percolation Calculator
Rate soil drainage from a simple timed percolation test
Athlete Training Age Calculator
Calculate your training age and appropriate periodisation phase.
Time-Lapse Storage Estimator
Calculate SD card / SSD storage needed for any time-lapse shoot
US Federal Holiday Working Days Counter
Count net working days excluding US federal holidays
Warhammer Age of Sigmar Points Calculator
Tally AoS army list points quickly
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
Square Footage Calculator
Calculate the area of a room in square feet and square metres, with optional cost
Pool Chlorine Dosage Calculator
Exact chlorine to raise free chlorine to target
Age in Days Calculator
Find your exact age in years, months, days — and total days lived.
Birthday Countdown Calculator
Count down the days, hours and minutes to your next birthday.
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.
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.
Time Card Calculator
Add up weekly hours from clock-in and clock-out times, with breaks and overtime.