Volume Converter

Written byOleh Soloninupdated 25 September 2026

Value

From

Result

Result0.264172
From unitlitre
To unitUS gallon
Conversion factor0.264172
Inverse factor3.785412
In other units
millilitre: 1,000 cubic metre: 0.001 cubic centimetre: 1,000 cubic foot: 0.035315 cubic inch: 61.0237 imperial gallon: 0.219969 US quart: 1.0567 US pint: 2.1134 US cup: 4.2268 US fluid ounce: 33.814

A gallon is not a gallon

Converts volume between litres, cubic metres, gallons, pints and fluid ounces, and shows the same quantity in the rest of the units at once.

The metric side is easy: a litre is a cubic decimetre, a cubic metre is a thousand litres, and everything is a shift of the decimal point. The trouble starts with the imperial units, where one name covers two different measures.

A US gallon is 3.785 litres and an imperial one is 4.546. The imperial quart and pint are likewise about twenty percent larger than the US ones — but the imperial fluid ounce is about four percent smaller. Which is why both systems are named explicitly in the list.

How to use

Enter a value.
Choose the unit you are converting from: litres, cubic metres, US or UK gallons, pints, cups, fluid ounces, barrels.
Choose the unit you are converting to. Below it you get the factor both ways and the same value in the other units.

US and imperial measures in metric

The US and the UK use the same names for different measures. The imperial gallon is 20 percent bigger than the US gallon, while the imperial fluid ounce is slightly smaller than the US one.

Every row comes from the calculator on this page.
Unit	In metric
1 US gallon	3.785 L
1 imperial gallon	4.546 L
1 US quart	0.946 L
1 US pint	473.18 ml
1 US cup	236.59 ml
1 US fluid ounce	29.57 ml
1 imperial fluid ounce	28.41 ml
1 oil barrel	158.99 L

Metric and cubic units

A litre is a cubic decimetre, so a cubic metre is exactly 1,000 litres. A cubic foot is 28.32 litres and a cubic inch 16.39 cubic centimetres.

Every row comes from the calculator on this page.
Unit	Equals
1 m³	1,000 L
1 cubic foot	28.32 L
1 cubic inch	16.39 cm³
1 litre	0.2642 US gallon
1 litre	0.22 imperial gallons
1 litre	33.81 US fl oz

What this calculator shows

An exact conversion between the pair of units you pick
The conversion factor and its inverse
The same quantity in several other units at once

What to keep in mind

US units are the liquid measures; the US dry pint and quart differ and are not used here.
A US cup is taken as 236.6 millilitres, the customary cup of half a US pint. US nutrition labels use a rounded 240 ml cup instead, which is why both figures turn up on packaging and in recipes.

FAQs

How many litres are in a gallon?

3.785 in a US gallon and 4.546 in an imperial one. If a text does not say which, look at where it comes from: American sources and recipes mean the US gallon.

How many millilitres are in a fluid ounce?

29.57 in a US fluid ounce and 28.41 in an imperial one.

How many millilitres is a US cup?

236.59 — half a US pint. US nutrition labels use a rounded 240 ml cup.

How many litres are in a cubic metre?

Exactly a thousand. A cubic metre is a cube one metre on each side; a litre is a cube one decimetre on each side.

What is a barrel of oil?

158.99 litres, or 42 US gallons. It is used only for oil: beer and dry barrels are different sizes.

How many litres in a cubic foot?

28.32. Cubic feet are how American fridge and freezer capacities are quoted.

Worked example

A litre in gallons

Input: 1 litre into US gallons

Output: 0.264172 gallons

Note: The same litre is about 0.22 imperial gallons — a number some 16.7 percent smaller, because the imperial gallon is 20 percent larger than the US one. That difference is exactly why miles-per-gallon figures from American and British cars cannot be compared directly.

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Volume Converter

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