From inches to centimetres, litres to gallons.
Everyday conversions, without the mental maths.
Choose a category, then enter your amount.
Use a dot for decimals, for example 2.5.
Rounded to 12 significant digits for display. Calculations use unrounded values.
The same units, at a few handy amounts.
US liquid and Imperial gallons, pints and fluid ounces are separate units. One Imperial pint is 568.26125 mL; one US liquid pint is 473.176473 mL. Ounces of mass are kept separate from fluid ounces.
Celsius, Fahrenheit and Kelvin use their own formulas. Values below absolute zero are not accepted.
Conversions run in your browser. No account, uploads or saved history. Refreshing starts again.
Volume definitions: UK Weights and Measures Act, Schedule 1 (opens in a new tab). Choose the measurement system stated by your source; a fluid ounce measures volume, not mass.