Convert between litres, millilitres, cubic metres, US and imperial gallons, cups and cubic feet.
Enter the values to see the result here.
Formula
Every volume is stored in litres:
xto=xfrom×ftoffrom
with f in litres: millilitre 0.001, cubic metre 1000, US gallon 3.785411784, imperial gallon 4.54609, US quart 0.946352946, US cup 0.2365882365, US fluid ounce 0.0295735295625, cubic foot 28.316846592. The US gallon holds 4 quarts, 8 pints, 16 cups or 128 fluid ounces.
Worked example
Convert 3 US gallons to litres.
3×3.785411784=11.356 L.
In imperial gallons: 11.356/4.54609=2.498.
The same 3 imperial gallons would be 3×4.54609=13.64 L, a difference of 2.28 L, which is why the gallon type matters.
Common mistakes
Using a UK gallon with US gallon prices or consumption figures.
Treating 1 L as 1 kg for anything but water. Oil, milk and honey have different densities.
Using the US fluid ounce for an imperial recipe: the imperial fluid ounce is 28.41 mL, about 4% less.
Mixing up dry and fluid ounces. This tool converts volumes only.
Frequently asked questions
Why is a US gallon smaller than a UK gallon?
They derive from different historic measures. The US gallon is 231 cubic inches (3.785 L); the imperial gallon was redefined in 1824 as the volume of 10 pounds of water, which is 4.546 L. The UK gallon is about 20% larger.
How do I convert fuel efficiency between mpg and L/100 km?
They are inverse, so use 235.215 ÷ mpg (US) for L/100 km. 30 mpg (US) is 7.84 L/100 km. The fuel cost calculator does this for you.
How many litres are in a cubic metre?
1,000. A cube 10 cm on each side holds 1 L, and a cubic metre holds 10 × 10 × 10 of those cubes.
Are US and UK cups and pints the same?
No. The US cup is 236.6 mL and the US pint 473 mL. The imperial pint is 568 mL. Use the cooking converter for recipes written in metric cups (250 mL).