How to convert units
Pick a category (length, weight, temperature, area, volume, or speed), choose the units you're converting from and to, and type a value. The result appears instantly. Use the swap button to flip the two units around. Everything runs in your browser — accurate and instant.
What you can convert
- Length — millimetres, centimetres, metres, kilometres, inches, feet, yards, miles
- Weight — milligrams, grams, kilograms, tonnes, ounces, pounds, stone
- Temperature — Celsius, Fahrenheit, Kelvin
- Area — square metres, hectares, acres, square feet, square miles
- Volume — millilitres, litres, gallons, pints, cups, fluid ounces
- Speed — m/s, km/h, mph, knots
Accurate and instant
The converter uses standard conversion factors and exact temperature formulas. Need other calculations? Try the percentage calculator or age calculator.