Volume converter

Convert litres, gallons, cups and more, US and UK

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How it works

To convert a volume, multiply it by the size of the first unit in litres, then divide by the size of the second. A US gallon is exactly 3.785411784 litres, and a UK gallon is exactly 4.54609 litres, so always check which one you mean.

result = value × litres in first unit ÷ litres in second unit

US and UK units share names but not sizes. We label each one, so a US pint is never mixed up with a UK pint.

Worked example. To change 10 litres to US gallons: 10 ÷ 3.785411784 ≈ 2.64 gallons.

Examples

From	To
1 Gallons (US)	≈ 3.79 Litres
1 Gallons (UK)	≈ 4.55 Litres
1 Litres	≈ 0.26 Gallons (US)
1 Cups (US)	≈ 236.59 Millilitres
1 Fluid ounces (US)	≈ 29.57 Millilitres
1 Tablespoons (US)	≈ 14.79 Millilitres

What this tool doesn’t cover

Cups here are US cups. Many other countries use a 250 ml metric cup.
Results show up to two decimal places.

Questions

How many litres are in a gallon?

A US gallon is about 3.785 litres. A UK gallon is about 4.546 litres.

How many millilitres are in a cup?

A US cup is about 237 ml. A metric cup is 250 ml.

Why are US and UK pints different?

They come from different gallons. A US pint is about 473 ml, and a UK pint is about 568 ml.

How many cups are in a litre?

A litre is about 4.23 US cups, or 4 metric cups of 250 ml.

How many ml are in a tablespoon?

A US tablespoon is about 14.8 ml, and a metric tablespoon is 15 ml. In Australia, a tablespoon is 20 ml.

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Sources: NIST Office of Weights and Measures (opens in a new tab), BIPM: SI units (opens in a new tab)