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Volume Converter

Type a value and pick the units. The result updates as you type, and the line below shows what one unit is worth in the other.

Result

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Which gallon this uses, and why it matters

This tool uses the US liquid gallon, 3.785411784 litres exactly. The imperial gallon used in the UK is 4.54609 litres — about 20% larger. A recipe or a fuel figure quoted in "gallons" means different things on either side of the Atlantic, and the gap is big enough to ruin both.

The fluid ounce splits the same way: the US one is about 29.57 ml, the imperial one about 28.41 ml. This tool uses the US value, which is the one most often searched for.

Frequently asked questions

How many liters are in a gallon?

A US gallon is 3.785411784 litres, exactly. An imperial gallon, still used in the UK, is 4.54609 litres.

How many milliliters are in a fluid ounce?

The US fluid ounce is 29.5735 ml. The imperial fluid ounce is 28.4131 ml — close enough to confuse, far enough to matter in a recipe.

Is a cubic meter the same as a kiloliter?

Yes. One cubic metre is exactly 1,000 litres, so the two are the same volume under different names.

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