Metric and US liquid volume

One liter equals exactly 1,000 milliliters. The US liquid gallon equals 3.785411784 liters and contains four quarts, eight pints, or 128 US fluid ounces.

Cooking measures

This tool uses a US cup of 236.5882365 milliliters, a tablespoon of three US teaspoons, and a teaspoon of one-sixth US fluid ounce. Recipe conventions and measuring tools may round these values.

US and imperial units differ

An imperial gallon, pint, and fluid ounce are not the same sizes as their US namesakes. Choose a converter that explicitly supports imperial units when following a UK or imperial specification.

A conversion you can check by hand

Suppose a recipe calls for 2.5 US cups. Because one US cup is 236.5882365 mL, multiply 2.5 by that factor to get about 591.47 mL. Converting the displayed milliliters back to cups should return 2.5 apart from rounding. This two-way check is useful when a copied value looks too large or too small. Keep all digits during the calculation and round only the amount you can actually measure; a kitchen jug marked every 50 mL does not justify a result reported to hundredths of a milliliter.

Choose the unit from the source

Read the original label before entering a value. “fl oz” on a US nutrition label, a metric bottle marked mL, and an imperial recipe are different sources, even when their unit names look familiar. For medication, laboratory work, trade, or regulated packaging, use the required instrument and governing definition rather than a general calculator. The conversion factors used here can be compared with the NIST Guide to the SI conversion table.

Volume-to-weight conversion depends on ingredient density and cannot be determined from volume alone. This tool converts volume only.