Converting volume and capacity
Volume conversions run through the liter as a base. Each unit has a fixed size (a US gallon is 3.785 L, a UK gallon is 4.546 L), so the value is expressed in liters and divided by the target unit. Note that US and imperial (UK) gallons differ, which is a common source of error.
Cooking and fuel in one tool
Recipes jump between cups, tablespoons and milliliters, while fuel and containers use gallons and liters. Converting between US customary cooking units and metric here keeps quantities right without a separate chart.
US vs. UK measures
US cups, pints and gallons are smaller than their UK counterparts. This tool uses US customary units for cups, quarts, pints and fluid ounces, and offers both US and UK gallons explicitly so you can pick the right one.
Frequently asked questions
How many milliliters in a cup?
A US cup is about 236.6 mL. UK and metric cups differ, so check which standard your recipe uses.
US gallon or UK gallon?
A US gallon is about 3.785 liters; a UK gallon is about 4.546 liters. Pick the matching option.
How many millilitres in a litre?
1,000 mL. A litre equals 1,000 cm³.
How many litres in a gallon?
A US gallon is 3.785 L; a UK (imperial) gallon is 4.546 L.
How much is a cup in millilitres?
A US cup is about 237 mL; a metric cup is 250 mL.