Volume Converter
Convert between liters, milliliters, gallons, cups, fluid ounces, and other volume units.
About this tool
Volume conversion is the kitchen and fuel station problem: recipes in cups and tablespoons, bottles in milliliters, fuel in liters or gallons. This converter handles the full ladder of US customary units alongside metric, using the exact definition of the US gallon as 3.785411784 liters.
Note that these are US measures. The UK imperial pint and gallon are about 20 percent larger, and a metric cup used in some countries is 250 ml rather than the US 236.6 ml. For cooking, small rounding rarely matters; for fuel economy or chemistry it does.
Frequently asked questions
How many milliliters in a US cup?
Exactly 236.5882365 ml. Recipe writers usually round to 237 ml or, in metric countries, substitute a 250 ml cup.
Is a US gallon the same as a UK gallon?
No. The US gallon is about 3.785 liters while the imperial gallon is about 4.546 liters, roughly 20 percent more.