Volume Converter

1. 1Type a value into any box — every other unit updates as you type.
2. 2Use the swap button to flip the two headline units.
3. 3Copy any result with the button beside it.
4. 4Adjust the decimal places if you need more or less precision.

All volumes convert through the litre, which is exactly 0.001 cubic metres. The cubic units — cubic centimetres, metres, inches and feet — follow from the cubed length factors.

The important thing here is that US and imperial units of the same name are different sizes, and mixing them up is a genuine source of ruined recipes and mis-fuelled vehicles. A US gallon is 3.785 litres; an imperial gallon is 4.546 — about 20% larger. A US pint is 473 ml against an imperial 568 ml. Both sets are listed separately and labelled, so you always know which one you are using.

Conversion works by taking your value to a single base unit and then out again, so every pair of units is consistent with every other. Values are calculated at full double precision and only rounded for display, which means round-tripping a number through two conversions returns what you started with.

• Check where a recipe comes from: American recipes use US cups and gallons, British ones imperial pints and gallons.
• Weigh dry ingredients such as flour when you can; a cup of flour can vary a lot depending on how it is packed.
• A metric teaspoon is 5 ml and a metric tablespoon 15 ml.
• Keep US and imperial units apart; a UK pint is about 20% larger than a US pint.

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