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Cups to millilitres, for cooking a US recipe with a metric measuring jug or scale. The cup is the least standardised unit in the kitchen — at least three different sizes are in active use — so knowing which one a recipe means matters more than the arithmetic does.
Frequently asked questions
How many ml is one cup?
236.588 ml for a US customary cup, which is what this converter uses and what almost all American recipes mean. A metric cup (Australia, New Zealand, and most modern UK recipes) is 250 ml, and a US *legal* cup used on nutrition labels is also 240 ml. The gap between 236.6 and 250 is about 6% — negligible in a soup, not negligible in a bake.
Can I use cups to measure flour accurately?
Not really, and this is why serious baking recipes give grams. A cup of flour weighs anywhere from 120 g to 150 g depending on whether it was scooped, spooned or sifted — a 25% swing on the main structural ingredient. Convert to volume if you must, but weigh if you can.