Unit Converters
Convert between metric units and the units used in the United States and the United Kingdom: kilometres and miles, kilograms and pounds, Celsius and Fahrenheit, litres and gallons, and bytes in decimal and binary units.
Every converter shows the conversion factor, its inverse and your value in every unit at once.
All 8 converters converters
- Length ConverterConvert between metres, kilometres, miles, yards, feet, inches and more
- Weight ConverterConvert between kilograms, grams, pounds, ounces, stone and tons
- Temperature ConverterConvert between Celsius, Fahrenheit, Kelvin and Rankine
- Area ConverterConvert between square metres, hectares, acres, square feet and more
- Volume ConverterConvert between litres, gallons, quarts, cups, fluid ounces and cubic units
- Speed ConverterConvert between km/h, mph, m/s, knots and feet per second
- Time ConverterConvert between seconds, minutes, hours, days, weeks, months and years
- Data Storage ConverterConvert between bits, bytes, KB, MB, GB, TB and the binary KiB, MiB, GiB, TiB
Exact factors, no rounding along the way
The factors are the exact legal definitions, such as 1 inch = 25.4 millimetres and 1 pound = 0.45359237 kilograms, so converting a value to another unit and back gives the starting value exactly. Rounding happens only when the result is displayed, and a leading ≈ tells you when it did.
US and imperial units that share a name but differ in size, such as the gallon and the fluid ounce, are listed separately, as are decimal (GB) and binary (GiB) storage units. Currency conversion is not offered, because exchange rates change all the time and need a live source.