# What is 20 cups to quarts?

Converts cups (cup) to quarts (qt) and back, with the exact unit definitions.

- Page: https://www.acalculator.org/convert/20-cups-to-quarts
- JSON spec: https://www.acalculator.org/convert/20-cups-to-quarts.json
- Version: 169cd7e2d4dc

## Default answer

Example with the default inputs (Cups (cup) 20): 20 cups = 5 qt.

## Inputs

| Key | Label | Description |
| --- | --- | --- |
| value | Cups (cup) | The amount in cups to convert. |
| result | Quarts (qt) | The same amount in quarts. |

## Outputs

| Key | Label | Description |
| --- | --- | --- |
| value | Cups (cup) | The amount in cups to convert. |
| result | Quarts (qt) | The amount in quarts. |

## Method

qt = cup × 0.25 (the same as cup ÷ 4)

## Assumptions

- 1 cup = 0.25 quarts, 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.
- Exact on the typed decimals: at most 6 decimal places (6 significant digits below 0.0001), rounded half up; an answer of 1 billion or more shows at most 15 significant digits.

## Worked examples

1. value = 1 gives result = 0.25. Source: Exact unit definitions in NIST SP 811 (2008), Appendix B.8.
2. value = 6 gives result = 1.5. Source: Exact unit definitions in NIST SP 811 (2008), Appendix B.8.
3. result = 1.5 gives value = 6. Source: Exact unit definitions in NIST SP 811 (2008), Appendix B.8.

## FAQ

### What is 20 cups in quarts?

20 cups is 5 qt. The formula is qt = cup × 0.25 (the same as cup ÷ 4).

### How many quarts are in a cup?

1 cup is 0.25 quarts, from the exact unit definitions (NIST SP 811).

### How do I convert cups to quarts?

Multiply by 0.25: qt = cup × 0.25 (the same as cup ÷ 4). For example, 20 cups × 0.25 = 5 qt.

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

Multiply by 4, or type the quarts into the second box and the converter works it out. 1 quart is 4 cups.

## Sources

- NIST SP 811 (2008), Guide for the Use of the International System of Units, Appendix B.8: Factors for Units Listed Alphabetically (bold factors are exact), retrieved 2026-10-18. https://www.nist.gov/pml/special-publication-811/nist-guide-si-appendix-b-conversion-factors/nist-guide-si-appendix-b8