Convert gallons to liters: 1 US gallon = 3.785 L, 1 imperial gallon = 4.546 L. Includes ml, m³ and cups — free with a reference table.
Volume measures the three-dimensional space occupied by a substance, and it's one of the quantities where the difference between measurement systems causes the most practical everyday confusion — especially in the kitchen. The litre, the metric system's central unit for liquids, was originally defined as the volume of one kilogram of pure water at 4°C (the temperature at which water reaches its maximum density), though today it's defined more precisely in terms of the cubic metre. The American volume system is notoriously more complex: there are "cups," "fluid ounces," "pints," "quarts," and "gallons," each with a non-intuitive relationship to the others, and on top of that the US gallon differs from the British imperial gallon — a real source of error in recipes, industrial formulas, and even fuel consumption calculations between countries. This converter handles that complexity by calculating exact conversions between metric and imperial/American volume, including the most commonly used cooking units. This is particularly relevant for anyone following recipes from other countries, calculating dosages of chemicals or liquid medications, or working in fields like chemical engineering and industrial processes, where volume is directly tied to flow rate calculations, reservoir capacity, and mixture proportions. A volume conversion error in professional contexts can mean anything from a recipe that doesn't turn out right to an entire industrial production batch falling out of specification.
1 liter is exactly equivalent to 1000 milliliters.
A US gallon equals about 3.785 liters.
1 cubic meter holds 1000 liters.
Generally, there are 16 tablespoons in 1 standard US cup.
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1 liter = 1,000 milliliters.
1 US gallon ≈ 3.78541 liters.
In US cooking measures, 1 cup ≈ 240 ml (some tables use 236.6 ml).
1 m³ = 1,000 liters.
Only if you know the liquid density. For pure water, 1 liter ≈ 1 kg; other liquids differ.