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Volume Converter
Convert liters, milliliters, gallons, quarts, cups and cubic meters instantly — no button to press.
Why do US recipes use cups and gallons instead of liters?
The liter is the standard metric unit of volume almost everywhere in the world, used for everything from bottled drinks to fuel to lab measurements. The US instead standardized on customary units — the gallon, quart and cup — for cooking, groceries and fuel. A US gallon (3.785411784 liters) is smaller than a UK imperial gallon, which is a common source of confusion when reading a recipe or a fuel-economy figure from a different country.
This is exactly the gap this converter is built to close: type a value in any of the 6 units above — liter, milliliter, US gallon, US quart, US cup or cubic meter — and get an instant, accurate result plus the full conversion table, whether you're scaling a recipe, converting a container's capacity, or checking a spec sheet.
Frequently asked questions
How many liters is one US gallon?
One US gallon equals 3.785411784 liters. Multiply gallons by 3.785411784 to get liters.
How many cups is one US quart?
One US quart equals 4 US cups, since one US quart equals 0.946352946 liters and one US cup equals 0.2365882365 liters.
Is a US gallon the same as a UK (imperial) gallon?
No. A US gallon (3.785 liters) is smaller than a UK imperial gallon (4.546 liters) — about 17% smaller — so recipes and fuel-economy figures don't convert 1-to-1 between the two.
How many liters is one cubic meter?
One cubic meter equals exactly 1000 liters, since a liter is defined as one-thousandth of a cubic meter.