# Milliliters to US cups converter

> Convert milliliters to US cups (ml to cups) with the exact factor, a conversion chart and worked steps.

Interactive version: https://www.calcopenly.com/conversion/ml-to-cups
Subject: Unit converters

Milliliter markings appear on measuring jugs and small containers. Read the volume scale, not a mass label, and identify the destination's cup or fluid-ounce convention. Kitchen measures are often approximate, so the vessel's graduations may limit the useful precision.

One millilitre is about 0.0042267528 US cups, so 250 mL is 1.056688 cup. To convert ml to cups, multiply by 0.0042267528; to convert back, multiply by 236.5882365.

The litre is exactly one cubic decimetre, so 1 L is 1,000 mL and 1 mL is 1 cm³. The factor has no exact decimal form, so results are computed with 50 significant digits and rounded only for display.

## Inputs

- **Milliliters (mL)**

## Results

- US cups (cup) — main result
- Conversion
- 1 cup in milliliters (mL)

## Formula

$$
\text{US cups} = \text{milliliters} \times 0.00422675283773
$$

## Worked examples

### 250 mL to cup

- Milliliters (mL): 250 mL
- **US cups: 1.0566882094 cup**
- Checked against: Exact-fraction computation from the legal unit definitions (scripts/gen-pairs.py, Python fractions)

### 150 mL to cup

- Milliliters (mL): 150 mL
- **US cups: 0.6340129257 cup**
- Checked against: Exact-fraction computation from the legal unit definitions (scripts/gen-pairs.py, Python fractions)

### 750 mL to cup

- Milliliters (mL): 750 mL
- **US cups: 3.1700646283 cup**
- Checked against: Exact-fraction computation from the legal unit definitions (scripts/gen-pairs.py, Python fractions)

## Questions

### When would I convert ml to cups?

Milliliter markings appear on measuring jugs and small containers. Read the volume scale, not a mass label, and identify the destination's cup or fluid-ounce convention. Kitchen measures are often approximate, so the vessel's graduations may limit the useful precision.

### How many US cups are in a millilitre?

One millilitre is about 0.0042267528 US cups. The litre is exactly one cubic decimetre, so 1 L is 1,000 mL and 1 mL is 1 cm³.

### How do you convert ml to cups?

Multiply the number of milliliters by 0.0042267528. For example, 250 mL × 0.0042267528 = 1.056688 cup. To go the other way, divide by 0.0042267528.

### How can I estimate ml to cups without a calculator?

Multiply by 0.0042. That is 0.6% low of the exact factor 0.0042267528, so 250 mL comes out as 1.05 cup instead of 1.0567.

### Is a cup 240 mL or 236.6 mL?

Both are in use. The US customary cup in recipes is 236.588 mL. US nutrition labels use a rounded "legal cup" of 240 mL (21 CFR 101.9), and the metric cup used in Australia, New Zealand and Canada is 250 mL.

### How accurate is the milliliters to US cups converter?

Accuracy depends on your inputs and the method's assumptions. Decimal arithmetic uses 50 significant digits, but estimates, numerical methods and source data can be less precise; the displayed rounding does not remove those limits. It is checked against 3 worked examples whose answers come from independent sources; for example, “250 mL to cup” is checked against Exact-fraction computation from the legal unit definitions (scripts/gen-pairs.py, Python fractions).

### Where does the method come from?

NIST SP 811 (2008), Guide for the Use of the International System of Units, Appendix B; NIST Handbook 44, Appendix C: General tables of units of measurement; BIPM, The International System of Units (SI Brochure), 9th edition.

## Sources

- [NIST SP 811 (2008), Guide for the Use of the International System of Units, Appendix B](https://www.nist.gov/pml/special-publication-811)
- [NIST Handbook 44, Appendix C: General tables of units of measurement](https://www.nist.gov/pml/weights-and-measures/publications/nist-handbooks/handbook-44)
- [BIPM, The International System of Units (SI Brochure), 9th edition](https://www.bipm.org/en/publications/si-brochure)