🧪 Volume Converter

Enter a value and pick its unit — every other unit updates instantly below. US customary (liquid) units are used for cups, pints, quarts and gallons.

Value

Unit

The US customary ladder

Every cup, pint, quart and gallon here is US liquid measure, converted through litres:

1 US gallon = 3.785411784 L = 4 quarts = 8 pints = 128 fl oz
1 US quart  = 0.946352946 L = 2 pints  = 32 fl oz
1 US pint   = 0.473176473 L = 2 cups   = 16 fl oz
1 US cup    = 0.2365882365 L = 8 fl oz
1 m³        = 1,000 L

Each step doubles or quadruples the one before it, so the whole system comes back to the fluid ounce of 29.5735 mL. Going the other way, 1 litre is 0.264172 US gallons and 33.814 US fluid ounces.

US against imperial

Unit	US liquid	Imperial (UK)	Imperial is
Gallon	3.7854 L	4.5461 L	20.1% bigger
Quart	946.4 mL	1,136.5 mL	20.1% bigger
Pint	473.2 mL	568.3 mL	20.1% bigger
Fluid ounce	29.574 mL	28.413 mL	3.9% smaller

The fluid ounce is the odd one out: the imperial one is slightly smaller, but an imperial pint holds 20 of them against the US pint's 16, which is where the 20% gap in the larger units comes from.

This converter uses US liquid units throughout. US dry measure is a separate system - a dry pint is 550.6 mL and a dry quart 1.101 L - and it is what berries and grain are sold in. If a recipe or a produce label says dry pint, these figures do not apply.

Frequently asked questions

Is a US gallon the same as an imperial gallon?

No. A US gallon is 3.785 litres and an imperial gallon is 4.546 litres, so the imperial one is 20.1% bigger. This tool converts US gallons; for an imperial figure, multiply litres by 0.219969 instead.

How many litres are in a gallon?

3.785 litres for a US gallon, 4.546 for an imperial gallon. A 15 US gallon fuel tank is 56.8 litres, while 15 imperial gallons would be 68.2 litres.

How many ounces are in a pint?

16 US fluid ounces, which is 473 mL. A British pint is 20 imperial fluid ounces, or 568 mL, so a pint of beer in London is about 20% larger than one in New York.