Unit converter

Metric to imperial and back: length, weight, volume, area, speed and temperature, including UK pints, stones and recipe spoons.

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Everything is converted through a base unit (metres, kilograms, litres, square metres, metres per second), using exact definitions: an inch is 25.4 mm, a pound is 0.45359237 kg, a UK pint is 568.26125 ml. UK and US measures differ: a UK pint is 20 fl oz and a US pint is 16, so the units are labelled.

Temperature uses formulas rather than ratios. Gas marks are a set of oven settings rather than a continuous scale, so the converter gives the nearest standard mark (for example 180°C is gas mark 4).

How many pounds in a stone?

14 pounds. One stone is about 6.35 kg.

What's 180°C in Fahrenheit and gas mark?

356°F, gas mark 4. Fan ovens usually run about 20°C lower.

Are UK and US pints the same?

No. A UK pint is 568 ml and a US pint is 473 ml.

How accurate is it?

Conversions use the exact definitions and are rounded for display to 6 decimal places.

Everything happens in your browser. Nothing you type or add is uploaded to us or anyone else, and the tool works with no account.

Free to use. Results are for convenience: check anything important before you rely on it.