Where do these numbers come from?
- NISTSP 811 exact unit definitions (1 in = 25.4 mm, 1 lb = 453.59237 g)current edition
- NISTHandbook 44, weights and measurescurrent edition
- King Arthur BakingIngredient Weight Chart (kitchen tools)retrieved Oct 23, 2026
Checked Oct 23, 2026. 1 US cup is exactly 236.5882365 mL (NIST SP 811), so 250 mL = 1.057 cups.
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What CupRuler does
CupRuler converts kitchen and everyday measurements accurately: grams to cups for more than 250 ingredients, oven temperatures including fan and gas marks, metric and US units, and recipe and pan scaling. Weight-to-volume figures come from the King Arthur Baking ingredient weight chart, and unit conversions use exact legal definitions (1 inch = 2.54 cm, 1 pound = 453.59237 g, 1 US cup = 236.588 mL).
Why weighing beats cups
A cup of flour can weigh anywhere from about 120 g to 150 g depending on how it is filled, which is enough to change a cake. Weighing removes that guesswork. If you only have cups, spoon the flour into the cup and level it, which is the method the King Arthur figures assume.
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