General Unit Converter
Enter a value and pick the unit to convert from and the unit to convert to.
This result is an estimate only. Double-check important figures before relying on them.
How it is calculated
- Each value is converted to a base unit (metre, kilogram, litre, square metre, metre per second or second), then to the unit you choose
- Temperature uses formulas: °F = °C × 9/5 + 32 and K = °C + 273.15
For cooking cups and spoons, use the cooking measurement converter.
Worked example
1 kilometre to miles:
- 1 km × 1,000 m ÷ 1,609.344 m = 0.6213712 mi
Why your number may differ
Results are rounded to 7 significant digits. Gallons, pints and cups differ between the US and UK, so check which you need.
Frequently asked questions
Which units can it convert?
Length, weight, volume, area, speed, time and temperature, from metric to US and imperial units.
Why can't I convert km to kg?
They measure different things. Pick a unit from the same group on both sides.
Which gallon and cup does it use?
US ones: a US gallon is 3.785 litres and a US cup is 236.6 ml. For a metric cooking cup, use the cooking measurement converter.