Convert between volume units
US gallon = 3.785 liters. UK (Imperial) gallon = 4.546 liters. The UK gallon is about 20% larger. This affects fuel economy comparisons—UK mpg figures appear higher than US mpg for the same vehicle.
1 liter = 1000 cubic centimeters (cc or cm³). 1 milliliter = 1 cc exactly. Engine displacement is often listed in cc (e.g., 2000cc = 2 liters). This relationship makes metric volume calculations easy.
A fluid ounce measures volume, not weight. US fl oz = 29.57 mL. UK fl oz = 28.41 mL. Confusingly, a fluid ounce of water weighs approximately one avoirdupois ounce, but this varies with density.
Using US cups: 1 liter ≈ 4.227 cups. Using metric cups (250 mL): 1 liter = exactly 4 cups. Always check which cup measurement your recipe uses—US, UK, and metric cups differ.
At 4°C, 1 liter of water weighs exactly 1 kilogram. 1 mL = 1 gram. This convenient relationship was intentionally designed into the metric system. Other liquids vary based on density.
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