Unit Converter
Convert length, weight, temperature, volume, time, speed, and area between metric, US, and imperial units. Instant, client-side.
A single converter for the everyday units you keep looking up — kilograms to pounds, kilometres to miles, Celsius to Fahrenheit, litres to gallons, and the rest. Pick a category, type a value, see everything else at once.
How to use it
No account, no upload — it all happens on your device.
Quick reference
The conversions people search for most.
- 1 inch = 2.54 centimetres
- 1 foot = 30.48 centimetres
- 1 mile = 1.609 kilometres
- 1 pound = 0.4536 kilograms
- 1 ounce = 28.35 grams
- 0 °C = 32 °F (water freezes)
- 100 °C = 212 °F (water boils at sea level)
- 1 US gallon = 3.785 litres
- 1 acre = 4047 square metres
- 1 knot = 1.852 km/h
A note on units
Temperature is the trickiest category because the conversion is affine, not multiplicative. Celsius and Fahrenheit share no common zero; Kelvin offsets from Celsius by 273.15; Rankine offsets from Fahrenheit by 459.67. We use the exact formulas rather than approximations so 0 °C lands precisely on 32 °F.
For time, "month" is treated as 30 days and "year" as 365 days. Calendar-accurate dates need a different tool — see the Unix Timestamp Converter for those.
US and Imperial gallons are different sizes — the imperial gallon (UK) is roughly 20% larger than the US gallon. Both are available so you don't have to guess which one a recipe or spec sheet means.