Everyday calculators and tools
Dates, ages, time, pace and unit conversions. 17 tools.
Dates and time
Age CalculatorExact age in years, months and days from a date of birth, plus the next birthday.Days Between Dates CalculatorNumber of days, weeks, months and years between two dates, with an include-end-date option.Days Until CalculatorCountdown in days to a future date — or days since a past one — from today's date.Date Calculator: Add or Subtract TimeFind the date a set number of years, months, weeks or days before or after a date.Working Days CalculatorCount working days between two dates, or add working days to a date, with your own holidays.Time Duration CalculatorWork out the hours and minutes between two clock times, or add and subtract a duration.Time Zone ConverterConvert a date and time between world time zones, handling daylight saving correctly.Pace CalculatorFind your pace, finish time or distance from the other two, in km or miles, with race times.
Unit converters
Unit ConverterOne converter for length, weight, temperature, area, volume, speed, time, data storage and fuel economy.Length ConverterConvert between kilometres, metres, centimetres, miles, yards, feet, inches and more.Weight ConverterConvert between kilograms, grams, pounds, ounces, stones, tonnes, quintals and carats.Temperature ConverterConvert between Celsius, Fahrenheit, Kelvin and Rankine, with absolute-zero checks.Area ConverterConvert square metres, hectares, acres, square feet, square yards, square miles and more.Volume ConverterConvert litres, millilitres, cubic metres, US and imperial gallons, cups, spoons and more.Speed ConverterConvert between km/h, mph, m/s, knots and feet per second.Fuel Economy ConverterConvert km/L, L/100 km, US mpg and UK mpg.Data Storage ConverterConvert bits, bytes, KB, MB, GB, TB and the binary KiB, MiB, GiB and TiB units.
About these everyday tools
Everyday questions usually come down to two things: how long between two moments, and how big something is in another unit. Date tools here use pure calendar arithmetic, so leap years and month lengths are handled exactly and nothing depends on your time zone. Time-zone conversion is the one exception — it uses your device's time-zone database.
All converters read from one shared table of conversion factors, using the exact legal definitions (an inch is exactly 25.4 mm, a US gallon is exactly 231 cubic inches), so two pages never disagree with each other.