Convert liquid and dry volume between metric, US customary and UK imperial units — ideal for cooking, fuel and science.
How to use the Volume Converter
- Enter a value.
- Choose the unit you are converting from.
- See the equivalent in every other unit.
US vs UK (imperial) units
A US gallon is 3.785 litres while a UK imperial gallon is 4.546 litres. US fluid ounces (29.57 ml) are also slightly larger than UK fluid ounces (28.41 ml). Always check which system a recipe uses.
Frequently asked questions
How many ml are in a cup?
A US cup is 236.6 ml; a metric cup is 250 ml.
How many litres are in a gallon?
3.785 litres in a US gallon, 4.546 litres in a UK gallon.
How precise are the conversions?
Conversion factors use the exact internationally defined values (e.g. 1 inch = 2.54 cm exactly). Results are shown to up to 10 significant digits.