# How do I convert cups to ml?

Converts cups (cup) to milliliters (mL) and back, with the exact unit definitions.

- Page: https://www.acalculator.org/convert/cups-to-ml
- JSON spec: https://www.acalculator.org/convert/cups-to-ml.json
- Version: 97f07079d6ca

## Default answer

Example with the default inputs (Cups (cup) 1): 1 cup = 236.588237 mL.

## Inputs

| Key | Label | Description |
| --- | --- | --- |
| value | Cups (cup) | The amount in cups to convert. |
| result | Milliliters (mL) | The same amount in milliliters. |

## Outputs

| Key | Label | Description |
| --- | --- | --- |
| value | Cups (cup) | The amount in cups to convert. |
| result | Milliliters (mL) | The amount in milliliters. |

## Method

mL = cup × 236.5882365

## Assumptions

- 1 cup = 236.5882365 milliliters, from the exact definitions in NIST SP 811.
- Cups, ounces, tablespoons, teaspoons, pints, quarts, and gallons are US customary units: 1 US cup is 8 US fluid ounces.
- The answer shows at most 6 decimal places; the calculation keeps full precision.

## Worked examples

1. value = 1 gives result = 236.588237. Source: Exact unit definitions in NIST SP 811 (2008), Appendix B.8.
2. value = 2 gives result = 473.176473. Source: Exact unit definitions in NIST SP 811 (2008), Appendix B.8.
3. result = 473.176473 gives value = 2. Source: Exact unit definitions in NIST SP 811 (2008), Appendix B.8.

## FAQ

### How many milliliters are in a cup?

1 cup is 236.588237 milliliters, from the exact unit definitions (NIST SP 811).

### How do I convert cups to ml?

Multiply by 236.588237: mL = cup × 236.5882365. For example, 1 cup × 236.588237 = 236.588237 mL.

### How do I convert ml back to cups?

Multiply by 0.004227, or type the milliliters into the second box and the converter works it out. 1 milliliter is 0.004227 cups.

## Sources

- NIST SP 811 (2008), Guide for the Use of the International System of Units, Appendix B.8. https://www.nist.gov/pml/special-publication-811