Unit Converter
AvailableConvert length, weight, volume, area, speed and temperature between common units.
Use the calculator
The numbers below are examples. Replace them with yours. Everything is worked out in your browser.
About this calculator
Convert between common units of length, weight, volume, area, speed and temperature. Conversions use the exact international definitions, such as 1 inch = 2.54 centimetres and 1 pound = 0.45359237 kilograms.
How it works
- Pick a category, enter a value and choose the units to convert from and to.
- Everything except temperature is converted through a base unit: metre, kilogram, litre, square metre or metre per second.
- Temperature is converted through kelvin, and values below absolute zero are rejected.
Common questions
Are US and UK gallons different?
Yes. A US gallon is 3.785411784 litres and a UK gallon is 4.54609 litres, so both are listed.
How precise is the result?
It is rounded to six decimal places, which is more than enough for everyday use.
Estimates only. Check important numbers before you rely on them.
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