Volume Converter
Convert between litres, gallons, pints and cups, keeping US and imperial measures apart.
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1 L
0.2641721 gal (US)
US gallon
In every unit
| Unit | Symbol | Value |
|---|---|---|
| Litre | L | 1 |
| Millilitre | mL | 1,000 |
| Cubic metre | m³ | 0.001 |
| Cubic centimetre | cm³ | 1,000 |
| Cubic foot | ft³ | 0.03531467 |
| Cubic inch | in³ | 61.02374 |
| US gallon | gal (US) | 0.2641721 |
| US quart | qt (US) | 1.056688 |
| US pint | pt (US) | 2.113376 |
| US cup | cup (US) | 4.226753 |
| US fluid ounce | fl oz (US) | 33.81402 |
| Imperial gallon | gal (UK) | 0.2199692 |
| Imperial pint | pt (UK) | 1.759754 |
| Imperial fluid ounce | fl oz (UK) | 35.19508 |
The family where the same word means two different things. A US gallon and an imperial gallon differ by twenty per cent, and so do their pints; their fluid ounces differ by four per cent, and the other way round. Both sets are listed separately here rather than blurred into one.
How it works
Every unit is defined as a number of litres and conversions go through the litre. A US gallon is 3.785411784 litres exactly; an imperial gallon is 4.54609 litres exactly.
The sub-units follow their own gallon: a US pint is an eighth of a US gallon and a UK pint an eighth of an imperial one, so a US pint is 473 ml and a UK pint 568 ml. The US cup here is the customary 236.588 ml, not the 240 ml used on nutrition labels.
Examples
| Case | Input | Result |
|---|---|---|
| A US gallon | 1 gal (US) | 3.785412 L |
| An imperial gallon, which is the larger of the two | 1 gal (UK) | 4.54609 L |
| A cubic foot | 1 ft³ | 28.31685 L |
Frequently asked questions
Which gallon does a recipe mean?
An American recipe means the US gallon and its pints and cups; a British one means the imperial gallon and its pints, though British recipes usually use millilitres. If the recipe is in cups it is almost certainly American.
Is a fluid ounce a weight?
No, it is a volume, and the two only coincide for water by rough coincidence. A fluid ounce of flour and a fluid ounce of honey weigh very different amounts, which is why baking by weight is more reliable than baking by volume.
Why are there two cup sizes?
The US customary cup is 236.5882365 ml, a sixteenth of a US gallon. US nutrition labelling uses a legal cup of 240 ml instead. This converter uses the customary one, which is what recipes mean.
Good to know
- Every factor used here is an exact definition rather than a rounded measurement, so the only error in a result is the one that comes from displaying it with a finite number of digits.