Cups to Milliliters

US cups and milliliters

The US customary cup is half a US pint: 8 US fluid ounces, exactly 236.5882365 milliliters. American recipes measure flour, sugar, milk and water in cups. US nutrition labels use a rounded legal cup of 240 mL.

The milliliter is one thousandth of a liter, the same volume as one cubic centimeter. Medicine doses, cosmetics, small bottles and metric recipes are measured in milliliters.

Worked example

Convert 2 cup: 2 × 236.5882365 = 473.176473, so 2 US cups is 473.176473 milliliters. Likewise 5 cup = 1,182.941183 mL.

Estimating in your head

Multiply by 240 for a quick figure; it is off by about 1.4%. For 2 cup that gives 480 mL, against 473.176 exactly.

Going the other way

To convert milliliters to US cups, divide by 236.5882365 (or multiply by 0.00422675283773). The swap button between the boxes opens that page.

mL = cup × 236.5882365

1 cup = 0.0002365882365 m³ and 1 mL = 0.000001 m³, both by definition, so the factor is their ratio: 236.5882365 exactly. Results drop binary floating-point noise beyond 15 significant digits and display at the precision you choose (6 significant figures by default). Copy result copies the full value.