How to Convert Cups to Milliliters
To convert cups to milliliters, multiply the number of US cups by 236.588, because one US cup is about 236.588 milliliters. The formula is ml = cups × 236.588. The converter above does it instantly. In everyday cooking, a cup is usually rounded to 240 ml, which is close enough for most recipes.
The Cups to ML Formula
One US customary cup equals about 236.588 milliliters, commonly rounded to 240 ml in nutrition labeling. To convert cups to milliliters, multiply by 236.588; to convert milliliters back to cups, divide by the same number. Note there are different “cups” in use: the US legal cup is 240 ml, the metric cup is 250 ml, and the old UK cup is about 284 ml. This converter uses the US customary cup, the most common in American recipes.
Worked Examples
1 cup: 1 × 236.588 = 236.59 ml. 0.5 cup: 118.29 ml. 2 cups: 473.18 ml. 0.25 cup: 59.15 ml. A standard 1-cup measure holds about 237 ml, and a 2-cup (1-pint) measure holds about 473 ml. These conversions are everyday tasks when following recipes that mix US and metric units.
Common Cups to ML Values
Quick reference: 1/4 cup ≈ 59 ml, 1/3 cup ≈ 79 ml, 1/2 cup ≈ 118 ml, 3/4 cup ≈ 177 ml, and 1 cup ≈ 237 ml. For a fast kitchen estimate, treat a cup as 240 ml; for accuracy in baking, use the converter above, which gives the precise US value.
Why Convert Cups to ML?
Cups are the standard volume measure in American recipes, while milliliters are used in most of the world and on nutrition labels. Converting cups to milliliters lets you follow a US recipe with a metric measuring jug, scale a recipe precisely, or compare serving sizes across labels. It is especially useful for bakers, who get more consistent results measuring liquids in milliliters than in cups, and for anyone cooking from international recipes.
Cups, Milliliters, and the Kitchen Ladder
Kitchen volume units link together in simple ratios: a cup is 16 tablespoons or 8 fluid ounces, a tablespoon is about 15 ml, and a teaspoon is about 5 ml. In metric terms, a cup is about 237 ml, half a liter is roughly two cups, and a liter is a little over four cups. Knowing these connections lets you substitute measuring tools and scale recipes confidently. The converter also supports liters, fluid ounces, pints, quarts, tablespoons, and teaspoons.
US, Metric, and UK Cups
If a result looks slightly off against a non-US recipe, the type of cup is usually why. The US customary cup is about 237 ml, the US legal cup (used on labels) is 240 ml, the metric cup is 250 ml, and the historic UK cup is about 284 ml. For American recipes — the most common case — the US cup used here is correct. When a recipe is explicitly metric or British, adjust to 250 ml or 284 ml respectively, and the rest of the conversion works the same way.
Quick Tips for Cups to ML
For mental math, round a cup to 240 ml: a half cup is about 120 ml, a quarter cup about 60 ml, and two cups about 480 ml. Scaling a recipe is easier in milliliters because you avoid awkward cup fractions — tripling 3/4 cup is simpler as tripling 177 ml to 531 ml. When precision matters, such as in baking or for medicine, use the exact value from the converter rather than the rounded estimate.
Frequently Asked Questions
How many ml in a cup?
One US cup is about 236.6 ml, often rounded to 240 ml.
How do I convert cups to ml?
Multiply the cups by 236.588 (or 240 for a quick estimate). For example, 2 cups = 473 ml.
Is a cup 250 ml?
A metric cup is 250 ml; a US customary cup is about 237 ml.