Converters
Volume Converter
Convert liters, milliliters, gallons, cups, and cubic meters.
Free to use — no sign-up or login.
A US gallon is 3.785411784 liters and displays as 3.78541 L. An imperial gallon is 4.54609 L. The two gallons are both in the list because they are not the same size.
Fuel figures in mpg use the fuel economy converter, which also asks which gallon you mean.
US cups, pints, and quarts
The cup, pint, quart, and fluid ounce in the list are US measures. One US cup is 0.0002365882365 m³. An imperial cup is not offered.
Cubic meters and liters
One liter is 0.001 m³, and one milliliter matches one cubic centimeter. Cubic feet use 0.028316846592 m³.
Worked example: one gallon
From US gallons to liters, 1 displays as 3.78541 L. From imperial gallons to liters, 1 displays as 4.54609 L.
\[ 1\,\mathrm{US\,gal}=3.785411784\,\mathrm{L} \]
Frequently asked questions
Why are there two gallons?
The US gallon is 3.78541 L and the imperial gallon is 4.54609 L.
Which cup is in the list?
The US cup. An imperial cup is not a choice.
Is a milliliter a cubic centimeter?
Yes. Both are 0.000001 m³.
Can this page convert flour cups to grams?
No. It converts volume, not the density of an ingredient.
Where do I convert mpg?
On the fuel economy page, which separates US and UK gallons.
References
Assumptions and limitations
Volume only. No ingredient densities, and the cup is the US cup. Results keep six significant digits.