Volume Unit Conversion Guide
Volume is the amount of three-dimensional space a substance occupies. The metric litre is the standard for most everyday volume measurements, while the US uses fluid ounces, cups, pints, quarts, and gallons. UK imperial measures use the same names but with slightly different values. Cooking, chemistry, and engineering each have preferred units.
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Formula
Volume Converter
Convert volume between litres, millilitres, gallons, cups, and fluid ounces.
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Worked Example
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FAQs
What is the difference between US and UK gallons?
A US gallon is 3.785 litres. A UK imperial gallon is 4.546 litres — about 20% larger. The same applies to pints and fluid ounces: a US pint is 473 mL while a UK pint is 568 mL. This difference matters when following international recipes or fuel efficiency ratings.
How do cooking volume measurements relate to weight?
For water, 1 mL = 1 g. For other ingredients, the relationship depends on density. 1 cup of flour weighs about 120–130 g, while 1 cup of butter weighs about 227 g. This is why professional recipes often specify weight rather than volume — it is more precise and accounts for variation in how ingredients are packed.
What is the volume of a standard wine bottle?
A standard wine bottle holds 750 mL = 0.75 litres. A magnum is 1.5 L (two bottles). A jeroboam is 3 L (four bottles). Standard wine glass servings are typically 150 mL (5 fl oz), so a 750 mL bottle contains five standard glasses.