Millilitres to Cups Converter
Convert millilitres to cups with the cup size made explicit. Select the US customary cup or a recipe-defined 250 mL cup before calculating.
Enter a zero or positive amount. Decimal values are supported. Only the displayed result is rounded.
The US cup factor follows the US customary relationship of 8 US fluid ounces per cup; NIST lists approximately 236.588 mL. The 250 mL option is a user-selected recipe volume, not a claim that all metric recipes use that cup size. See NIST volume conversion factors.
Formula
cups = mL ÷ mL per selected cup
Example: 500 mL is about 2.113 US customary cups, or exactly 2 cups when the recipe defines a cup as 250 mL.
About these units
A “cup” can vary by recipe convention. This tool defines a US customary cup as 236.5882365 mL and offers 250 mL only for recipes that specify that size.
Everyday conversion examples
For a quick estimate, compare the same metric volume under the two cup definitions. Select the cup standard used by your recipe or measuring vessel.
| Millilitres | US customary cups | 250 mL recipe cups |
|---|---|---|
| 125 | 0.528 | 0.5 |
| 250 | 1.057 | 1 |
| 500 | 2.113 | 2 |
| 1,000 | 4.227 | 4 |
Examples are rounded for readability. Use the calculator above for another amount; it keeps the conversion factor until the final display.
Why do the two cup answers differ?
The US customary cup is about 236.588 mL, while the optional recipe-defined cup is 250 mL. A larger cup means fewer cups for the same volume.
Which result should I use?
Choose US customary for a US measuring cup. Choose 250 mL only when the recipe defines a cup that way; otherwise use the measurement printed in the recipe.
Source
Conversion factors are based on customary and metric volume relationships documented by the National Institute of Standards and Technology (NIST), Guide to the SI, Appendix B.9. NIST reports rounded factors; this page displays a rounded result.