Volume Converter
Convert between litres, millilitres, gallons, cups, fluid ounces, cubic metres, and more.
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How to use this calculator
- 1
Type the volume value in the "From" field.
- 2
Choose the unit you are converting from (e.g. litres).
- 3
Choose the unit you want as the result (e.g. US gallons).
- 4
The answer updates instantly. Swap the units with the ⇄ button to reverse.
Frequently asked questions
How different are the US and UK gallons?
A US gallon is exactly 3.785411784 L and an imperial (UK) gallon is exactly 4.54609 L. One imperial gallon is 1.200949926 US gallons, so it is about 20 percent bigger. That is why a 30 mpg car is rated differently in the US and UK; check the fuel converter for that case.
How many millilitres are in a cup, tablespoon or teaspoon?
The converter uses US customary measures: 1 cup is 236.5882365 mL, 1 tablespoon is 14.78676478 mL and 1 teaspoon is 4.928921594 mL. A cup is 16 tablespoons or 48 teaspoons, and a tablespoon is 3 teaspoons. Metric recipes often use a 250 mL cup, which is 1.056688209 US cups.
Is the fluid ounce the same in the US and UK?
No. The US fluid ounce in this tool is 29.5735295625 mL, and 128 of them make one US gallon. The imperial fluid ounce is about 28.41 mL. Only the US ounce is offered here, so a UK recipe in imperial ounces and pints needs a manual adjustment.
What is the pint in the list?
It is the US liquid pint, 16 US fluid ounces or 0.473176473 L, with two pints to a quart and eight to a gallon. The imperial pint is larger, one eighth of an imperial gallon, about 568.26 mL, and is not a separate entry.
How do cubic metres, litres and cubic centimetres relate?
A litre is exactly 1,000 cm³ and a millilitre is exactly 1 cm³. A cubic metre holds 1,000 L. So 3 m³ is 3,000 L, and 250 mL is 250 cm³. These metric steps are exact multiples of ten.
Does it cover dry measures like bushels or dry pints?
No. The US gallon, quart, pint and cup here are liquid units. Dry quarts and pints are slightly different volumes, and bushels are absent. Use the exact figures only when measuring liquids or when the unit is genuinely the liquid one.
How big is a cubic foot or cubic inch in litres?
One cubic foot is 28.31684659 L, equal to 1,728 in³ and 7.480519481 US gallons. One cubic inch is 16.387064 mL. A US gallon is defined as exactly 231 in³, which is the link between the customary and metric sides.
Volume units: litres, US gallons, imperial gallons and kitchen measures
The US gallon is 231 cubic inches
A US liquid gallon is defined as 231 cubic inches, which equals exactly 3.785411784 litres. The imperial gallon is 4.54609 L, and one imperial gallon is 1.200949926 US gallons. The quart, pint, cup, fluid ounce, tablespoon and teaspoon in the list are US customary and nest in exact ratios: 1 gal = 4 qt = 8 pt = 16 cups = 128 fl oz = 256 tbsp = 768 tsp. The converter uses these full figures. The litre and millilitre sit on the metric side, with 1 L = 1,000 mL = 1,000 cm³ and 1 m³ = 1,000 L, so those steps are always exact powers of ten.
Reference values taken from the converter
Each row begins with one unit and shows litres, millilitres and both gallons, copied from the tool’s output.
| From | Litres | Millilitres | US gallons | UK gallons |
|---|---|---|---|---|
| 1 US gal | 3.785411784 | 3,785.411784 | 1 | 0.83267418 |
| 1 UK gal | 4.54609 | 4,546.09 | 1.200949926 | 1 |
| 1 L | 1 | 1,000 | 0.26417205 | 0.21996925 |
| 1 US qt | 0.94635295 | 946.352946 | 0.25 | 0.20816855 |
| 1 US cup | 0.23658824 | 236.5882365 | 0.0625 | 0.052042137 |
| 1 ft³ | 28.31684659 | 28,316.846592 | 7.480519481 | 6.228835459 |
Worked examples: tanks, jugs and spoons
A 20 US gallon tank holds 75.70823568 L, which is 16.65348369 imperial gallons, so quoting a tank in the wrong gallon is a 20 percent error. A 250 mL measure is 1.056688209 US cups, or 8.453505675 fl oz. Three tablespoons are 44.36029434 mL, 1.5 fl oz and 9 teaspoons. A 50 L container is 13.20860262 US gallons. For container sizing, 1 US gallon is 231 in³ and 1 ft³ is 7.480519481 gallons, so a 2 ft³ box is not 15 gallons but a little less.
Cooking, fuel and the gallon you mean
Recipes from the US use cups and spoons, recipes from most other countries use millilitres, and some countries round a cup to 250 mL rather than 236.5882365 mL. For fuel, the gallon is the unit to confirm: US pumps price per US gallon, while older UK documents use imperial gallons. When in doubt, convert both and see which answer matches the number printed on the label.
What is not covered
Dry volume measures and the imperial pint, fluid ounce, cup and spoon are not separate entries. All smaller US units are liquid measures. Displayed results carry about ten significant digits, which is more precision than any measuring jug offers, so round to your container’s scale markings.
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Results are estimates for informational purposes only and do not constitute professional financial, medical, legal, or technical advice. Read full disclaimer →