# Milliliters to US cups (mL to cup)

> Convert milliliters to US cups: 1 mL = 0.00422675 cup. Exact conversion factor, formula, 22-row table and worked examples, with JSON API and MCP access.

- Page id: `ml-to-cups` · Quantity: Volume (`volume`, base unit L) · Tool: `convert_units`
- Canonical page: https://tttkmbb.com/conversion/ml-to-cups · This document: https://tttkmbb.com/conversion/ml-to-cups.md · JSON: https://tttkmbb.com/conversion/ml-to-cups.json (add `?value=` for a result)

## Formula

- `1 mL = 0.00422675 cup`
- `US cups = milliliters × 0.004226752838`
- Reverse: `milliliters = US cups × 236.5882365`

The factor follows from the SI definitions of both units (NIST SP 811); values below are rounded to 6 significant figures, the API returns up to 12.

## Worked examples

- 5 mL = 0.0211338 cup
- 12.5 mL = 0.0528344 cup
- 100 mL = 0.422675 cup

## Conversion table

| Milliliters (mL) | US cups (cup) |
| --- | --- |
| 1 | 0.00422675 |
| 2 | 0.00845351 |
| 3 | 0.0126803 |
| 4 | 0.016907 |
| 5 | 0.0211338 |
| 6 | 0.0253605 |
| 7 | 0.0295873 |
| 8 | 0.033814 |
| 9 | 0.0380408 |
| 10 | 0.0422675 |
| 15 | 0.0634013 |
| 20 | 0.0845351 |
| 25 | 0.105669 |
| 30 | 0.126803 |
| 40 | 0.16907 |
| 50 | 0.211338 |
| 75 | 0.317006 |
| 100 | 0.422675 |
| 200 | 0.845351 |
| 250 | 1.05669 |
| 500 | 2.11338 |
| 1000 | 4.22675 |

## API

- `GET https://tttkmbb.com/api/v1/convert?value=5&from_unit=mL&to_unit=cup_us` → unified JSON envelope with `result.values.result`, `formula`, `factor`, `sources`, `freshness`
- MCP: server `https://tttkmbb.com/mcp`, tool `convert_units` with `{"value":5,"from_unit":"mL","to_unit":"cup_us"}`
- All volume units: https://tttkmbb.com/api/v1/units?quantity=volume · full converter: [Volume Converter](https://tttkmbb.com/conversion/volume.md)
- Authentication: none. Freshness: `static` (fixed conversion factors).

## FAQ

**How many US cups are in one milliliter?**

1 mL = 0.00422675 cup. The factor comes from the SI definitions of both units (NIST SP 811 / BIPM), so it is exact or correct to at least 10 significant figures.

**What is the formula to convert milliliters to US cups?**

Multiply the value in milliliters by 0.004226752838: US cups = milliliters × 0.004226752838. For example, 5 mL = 0.0211338 cup.

**How do I convert US cups back to milliliters?**

Multiply by the inverse factor 236.5882365 (milliliters = US cups × 236.5882365), or use the US cups-to-milliliters page.

## Related conversions

- [US cups to milliliters](https://tttkmbb.com/conversion/cups-to-ml.md) (reverse)
- [Liters to US gallons](https://tttkmbb.com/conversion/liters-to-gallons.md)
- [US gallons to Liters](https://tttkmbb.com/conversion/gallons-to-liters.md)
- [Milliliters to US fluid ounces](https://tttkmbb.com/conversion/ml-to-fl-oz.md)
- [US fluid ounces to Milliliters](https://tttkmbb.com/conversion/fl-oz-to-ml.md)
- [Liters to Milliliters](https://tttkmbb.com/conversion/liters-to-ml.md)
- [Milliliters to Liters](https://tttkmbb.com/conversion/ml-to-liters.md)
- [US tablespoons to Milliliters](https://tttkmbb.com/conversion/tablespoons-to-ml.md)
- [Milliliters to US tablespoons](https://tttkmbb.com/conversion/ml-to-tablespoons.md)

## Data Sources

- NIST Special Publication 811 – Guide for the Use of the International System of Units (SI), Appendix B conversion factors — https://www.nist.gov/pml/special-publication-811 (standard, retrieved 2026-09-24)
- BIPM – The International System of Units (SI Brochure, 9th edition) — https://www.bipm.org/en/publications/si-brochure (standard, retrieved 2026-09-24)
- Wikipedia – Conversion of units — https://en.wikipedia.org/wiki/Conversion_of_units (reference, retrieved 2026-09-24)