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US cups to Millilitres Converter

Enter a value in us cups to convert it to millilitres, litres.

How it is calculated

This is a single multiplication by a fixed factor: mL = cups × 236.5882365 and L = cups × 0.2365882365. The factor is the US customary cup, defined as 8 US fluid ounces, which is about 236.59 mL. Millilitres are shown with two decimals and litres with four.

Any number is accepted, including decimals such as 0.25 or 1.5 and even negative values, which simply give a negative volume. Nothing is rounded before the multiplication, only the displayed result. The factor is for liquid volume: it converts the capacity of a cup, not a weight of flour or sugar, which would need the ingredient's density. Other cups differ: the US nutrition-label cup is 240 mL and the metric cup is 250 mL, so a recipe from another country may need a different factor.

Worked example

A recipe asks for 1.5 US cups of milk and your jug is marked in millilitres. Multiply 1.5 × 236.5882365 = 354.882. The tool rounds this to 354.88 mL, and in litres that is 1.5 × 0.2365882365 = 0.3549 L. In practice you would pour roughly 355 mL. Had you used a 250 mL metric cup by mistake, you would measure 375 mL, about 20 mL too much.

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Common mistakes

  • Using this factor for a metric or Australian cup (250 mL) or the 240 mL nutrition-label cup. The three differ by a few millilitres per cup, which adds up in large quantities.
  • Confusing a US cup with an imperial UK cup or with a tea cup. Only the US customary cup is converted here.
  • Treating the result as weight. Millilitres measure volume, so 354.88 mL of flour does not weigh 354.88 g.
  • Measuring a dry ingredient by pouring it into a liquid jug. Dry measures are packed differently, so weigh dry goods with a scale where the recipe gives weights.
  • Rounding 236.59 to 240 mentally. Over four cups, that adds about 14 mL; for baking, use the exact figure.

About this calculator

The US customary cup used in recipes equals exactly 236.588 mL (8 US fluid ounces); note this differs slightly from the rounded “US legal cup” of 240 mL used on US nutrition labels, and more noticeably from the metric cup (250 mL) used in Australia and some other countries.

Home cooks and bakers working from American recipes need this conversion constantly when using metric measuring jugs or scales, since a cup-based recipe scaled or followed with the wrong cup definition can throw off baking ratios enough to affect texture.

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Comments (1)

  • Editorial team

    Cups are not the same everywhere, and the factor here is only the US one. Older British and some other recipes use a cup of about 284 mL, half an imperial pint, which is about 20 percent larger. If a recipe feels oddly large or small after converting, check where and when it was written. Which country or era is your recipe from?

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