Type a value into any field and instantly see it converted across liters, milliliters, US & UK gallons, US cups, fluid ounces, cubic meters and cubic feet.
Runs entirely in your browser — nothing you enter is uploaded or stored.
Liters, mL, US & UK gallons, cups, fl oz, m³ and ft³ all update together.
Handles the imperial gallon separately, since it differs from the US gallon by about 20%.
No accounts, no uploads — every calculation stays on your device.
Enter a volume in whichever unit you already have, and the rest fill in automatically.
Volume units split into metric (liters, milliliters, cubic meters) and US or UK customary units (gallons, cups, fluid ounces, cubic feet). The trickiest part is that the US gallon and UK imperial gallon are genuinely different volumes, so a recipe, fuel tank spec or fluid capacity listed in "gallons" can mean two different amounts depending on the country of origin.
This converter routes every value through liters as its base unit, using exact definitions: 1 US gallon = 3.785411784 L, 1 UK gallon = 4.54609 L, 1 US cup = 236.5882365 mL, and 1 cubic foot = 28.316846592 L. Because these are exact defined conversions, results carry no rounding error beyond floating-point display.
A UK gallon (4.54609 L) is about 20% larger than a US gallon (3.785411784 L) — always check which one a source means.
One US cup is exactly 8 US fluid ounces (236.5882365 mL), the standard used in American recipes.
Used for shipping, construction and appliance capacities; 1 cubic foot equals exactly 28.316846592 liters.
For teaspoons and tablespoons, use the dedicated cooking measurement converter, since those units are volume-only by design.
Common questions about converting between liters, gallons, cups and cubic units.
One US gallon equals exactly 3.785411784 liters. This is different from the UK imperial gallon.
A UK (imperial) gallon equals exactly 4.54609 liters, about 20% more than a US gallon (3.785411784 liters). Always check which gallon a recipe or spec sheet means.
One US customary cup equals exactly 236.5882365 milliliters, which is different from the metric cup (250 mL) used in Australia and some other countries.
One US customary cup equals exactly 8 US fluid ounces, since both are defined from the same 236.5882365 mL cup measurement.
Yes for volume-based units like cups, fluid ounces and milliliters. For teaspoons and tablespoons specifically, use the dedicated cooking measurement converter.