Volume Converters: Liters to Gallons, ml to Cups

Volume is where regional definitions cause the most confusion. A US gallon is 3.785 L while a UK (imperial) gallon is 4.546 L; a US legal cup is 240 ml while a US customary cup is 236.6 ml. Our converters state which definition they use so your recipe or fuel calculation lands on the right number.

Use these tools for converting recipes between metric and US measurements, comparing fuel prices per litre and per gallon, or sizing containers. For ingredient-specific cup-to-gram conversions (flour, sugar, butter), see the Cooking & Baking converter, which accounts for ingredient density.

All volume converters

Pick a tool to see the calculator, formula, worked example, and FAQs.

Volume Liters → Gallons Liters to US and UK gallons. Volume Gallons → Liters US gallons to liters. Volume ml → Cups Milliliters to US cups. Volume Cups → ml US cups to milliliters.

Sources & methodology

Formulas and conversion factors in this section follow:

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