# Liters to US cups (L to cup)

> Convert liters to US cups: 1 L = 4.22675 cup. Exact conversion factor, formula, 22-row table and worked examples, with JSON API and MCP access.

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

## Formula

- `1 L = 4.22675 cup`
- `US cups = liters × 4.226752838`
- Reverse: `liters = US cups × 0.2365882365`

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 L = 21.1338 cup
- 12.5 L = 52.8344 cup
- 100 L = 422.675 cup

## Conversion table

| Liters (L) | US cups (cup) |
| --- | --- |
| 1 | 4.22675 |
| 2 | 8.45351 |
| 3 | 12.6803 |
| 4 | 16.907 |
| 5 | 21.1338 |
| 6 | 25.3605 |
| 7 | 29.5873 |
| 8 | 33.814 |
| 9 | 38.0408 |
| 10 | 42.2675 |
| 15 | 63.4013 |
| 20 | 84.5351 |
| 25 | 105.669 |
| 30 | 126.803 |
| 40 | 169.07 |
| 50 | 211.338 |
| 75 | 317.006 |
| 100 | 422.675 |
| 200 | 845.351 |
| 250 | 1056.69 |
| 500 | 2113.38 |
| 1000 | 4226.75 |

## API

- `GET https://tttkmbb.com/api/v1/convert?value=5&from_unit=L&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":"L","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 liter?**

1 L = 4.22675 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 liters to US cups?**

Multiply the value in liters by 4.226752838: US cups = liters × 4.226752838. For example, 5 L = 21.1338 cup.

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

Multiply by the inverse factor 0.2365882365 (liters = US cups × 0.2365882365), or use the US cups-to-liters page.

## Related conversions

- [US cups to liters](https://tttkmbb.com/conversion/cups-to-liters.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 cups to Milliliters](https://tttkmbb.com/conversion/cups-to-ml.md)
- [Milliliters to US cups](https://tttkmbb.com/conversion/ml-to-cups.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)