Volume Converter

Convert volume between millilitres, litres, cubic metres, US and UK fluid ounces, cups, pints, quarts, gallons, and cubic inches and feet, with all units shown at once.

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Volume

Convert volume between metric, US, and UK units

Enter a volume and choose a unit — millilitres, litres, cubic metres, US cups, pints, quarts, gallons, UK pints and gallons, fluid ounces, and cubic inches and feet are all shown at once.

Value From unit

Metric

Millilitres 1,000 ml

Litres 1 L

Cubic metres 0.001 m³

Cubic centimetres 1,000 cm³

US Customary

US fluid ounces 33.814 fl oz (US)

US cups 4.2268 cup

US pints 2.1134 pt (US)

US quarts 1.0567 qt (US)

US gallons 0.2642 gal (US)

UK Imperial

UK fluid ounces 35.1951 fl oz (UK)

UK pints 1.7598 pt (UK)

UK gallons 0.22 gal (UK)

Cubic

Cubic inches 61.0237 in³

Cubic feet 0.0353 ft³

Quick reference

1 US gal = 3.785 L = 0.833 UK gal
1 UK gal = 4.546 L = 1.201 US gal
1 US pint = 473 ml (≠ UK pint)
1 UK pint = 568 ml
1 US cup = 237 ml
1 fl oz (US) ≈ 29.6 ml; (UK) ≈ 28.4 ml

Volume

Volume conversion: litres, gallons, cups, pints, and cubic units explained

A volume converter translates any liquid or dry volume into all common units at once. This tool covers metric units (ml, L, m³), US customary units (fl oz, cups, pints, quarts, gallons), UK imperial units (fl oz, pints, gallons), and cubic units (in³, ft³).

Why US and UK volume units differ

The US and UK both use names like pint and gallon but with different values. A US pint is 473 ml; a UK (imperial) pint is 568 ml — about 20% larger. A US gallon is 3.785 L; a UK gallon is 4.546 L. A US fluid ounce is approximately 29.57 ml; a UK fluid ounce is 28.41 ml. These differences matter when cooking from recipes, filling fuel tanks, or comparing product volumes across markets.

The metric system is unambiguous: 1 litre = 1,000 millilitres = 1 cubic decimetre = 0.001 cubic metres. No variant exists. When precision matters, always specify metric.

US customary volume relationships

The US system has a straightforward nested structure: 1 US gallon = 4 US quarts = 8 US pints = 16 US cups = 128 US fluid ounces. Each step is a factor of 2 or 4. 1 US fluid ounce = 2 US tablespoons = 6 US teaspoons (not covered in this converter, which focuses on larger units). 1 US gallon = 3.785411784 L exactly.

For cooking, the US cup is the common reference. 1 US cup = 8 US fl oz = 236.588 ml. Half a cup is 118 ml. US recipe measurements in cups translate directly to ml using this converter.

Cubic units and liquid volume

1 cubic centimetre (cm³) = 1 millilitre. This equivalence is exact and important: it means a 1 cm × 1 cm × 1 cm box holds 1 ml. 1 litre = 1,000 cm³ = 1 cubic decimetre. 1 m³ = 1,000 litres. These relationships are fundamental to understanding liquid displacement, tank volumes, and fluid mechanics.

Cubic inches and cubic feet are the US/UK counterparts. 1 cubic inch = 16.387 ml. 1 cubic foot = 1,728 cubic inches = 28.317 L. For tank and pool volume calculations, entering the cubic metres or cubic feet makes it easy to cross-reference with litre or gallon capacities.

Practical uses: cooking, fuel, and beverages

Cooking: US recipes use cups, tablespoons, and fluid ounces; UK and Australian recipes use ml and litres. Fuel: cars are filled in litres (most of the world) or gallons (US and UK — but different gallon sizes). Beverages: beer and cider are sold in pints in UK pubs (568 ml) but US pints in American bars (473 ml). Knowing the difference prevents ordering the wrong amount.

For product comparison across countries, enter the listed volume in either unit and see both. For cooking, enter the US cup or fl oz amount and see the ml equivalent.

Frequently asked questions

How many ml in a pint — US or UK?

A US pint = 473.18 ml. A UK (imperial) pint = 568.26 ml. The UK pint is about 20% larger. Make sure you know which pint your recipe or order uses.

How many litres in a US gallon vs a UK gallon?

A US gallon = 3.785 L. A UK (imperial) gallon = 4.546 L. The UK gallon is about 20% larger, the same ratio as for pints because both systems use the same nested structure (8 pints = 1 gallon).

Is a cubic centimetre the same as a millilitre?

Yes, exactly. 1 cm³ = 1 ml by definition. This is because the litre was originally defined as the volume of a 10 cm × 10 cm × 10 cm cube = 1,000 cm³ = 1,000 ml. So 1 cm³ = 1 ml, and 1 m³ = 1,000 L.

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