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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A metric cup (used in Australia and elsewhere) is 250 mL, slightly more than a US cup (236.6 mL). This converter uses US cups.
| mL | US cups |
|---|---|
| 50 | 0.211 |
| 100 | 0.423 |
| 125 | 0.528 |
| 150 | 0.634 |
| 200 | 0.845 |
| 250 | 1.057 |
| 300 | 1.268 |
| 500 | 2.113 |
| 750 | 3.17 |
| 1000 | 4.227 |
Which cup?
A US customary cup is 236.588 mL. Nutrition labels use a 240 mL "legal" cup. Australia, New Zealand and Canada use a 250 mL metric cup, and the old UK imperial cup is 284 mL. So 500 mL is 2.11 US cups but exactly 2 metric cups.
Liquids vs dry ingredients
mL to cups is a volume conversion and is exact for liquids. For flour, sugar and other dry ingredients, recipes in grams are more reliable; use the grams to cups converter.
Frequently asked questions
Is 250 mL one cup?
About 1.06 US cups; a metric cup is 250 mL.
How many mL is 1 cup?
236.6 mL in the US, 250 mL for a metric cup.
Is 1 mL of water 1 gram?
Very nearly, at room temperature. That is not true for oil, milk or honey.