Volume and cooking converter
Cups, spoons, fluid ounces, pints and gallons in US, imperial and metric sizes
Type an amount and pick two units. The example turns 1 US cup into milliliters.
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The same amount in every unit
Why sizes differ
Many kitchen and drink measures share a name but not a size. A US gallon is 3.785411784 liters (231 cubic inches, NIST Handbook 44). An imperial gallon, used in the UK, is 4.54609 liters (UK Weights and Measures Act 1985). Fluid ounces and pints follow their own gallon, so a UK pint holds 568 mL and a US pint 473 mL. Every size is listed on its own here, and a note appears when you pick one that has a twin.
Cups and spoons
A US cup is 8 US fluid ounces, 236.6 mL. US nutrition labels round it to 240 mL, as the FDA labeling rule allows. Australia, New Zealand and Canada cook with a 250 mL metric cup. Teaspoons are 5 mL nearly everywhere. Tablespoons are 15 mL, except in Australia, where a tablespoon holds 20 mL. The metric cup and spoons are kitchen conventions, not legal units.
Cups are volume, not weight
This page converts volume to volume. A cup of flour and a cup of sugar weigh different amounts, so cups cannot be turned into grams without knowing the ingredient. For drinks, see mL to oz.
Rounding
The answer is worked out from the exact definition, then shown to 4 decimal places (6 significant figures for numbers below 1). It says "exactly" only when nothing was rounded.