# What is 15.5 cups to gallons?

Converts cups (cup) to gallons (gal) and back, with the exact unit definitions.

- Page: https://www.acalculator.org/convert/15-point-5-cups-to-gallons
- JSON spec: https://www.acalculator.org/convert/15-point-5-cups-to-gallons.json
- Version: 0d878ef3bf05

## Default answer

Example with the default inputs (Cups (cup) 15.5): 15.5 cups = 0.96875 gal.

## Inputs

| Key | Label | Description |
| --- | --- | --- |
| value | Cups (cup) | The amount in cups to convert. |
| result | Gallons (gal) | The same amount in gallons. |

## Outputs

| Key | Label | Description |
| --- | --- | --- |
| value | Cups (cup) | The amount in cups to convert. |
| result | Gallons (gal) | The amount in gallons. |

## Method

gal = cup × 0.0625 (the same as cup ÷ 16)

## Assumptions

- 1 cup = 0.0625 gallons, 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.

## Worked examples

1. value = 1 gives result = 0.0625. Source: Exact unit definitions in NIST SP 811 (2008), Appendix B.8.
2. value = 16 gives result = 1. Source: Exact unit definitions in NIST SP 811 (2008), Appendix B.8.
3. result = 1 gives value = 16. Source: Exact unit definitions in NIST SP 811 (2008), Appendix B.8.

## FAQ

### What is 15.5 cups in gallons?

15.5 cups is 0.96875 gal. The formula is gal = cup × 0.0625 (the same as cup ÷ 16).

### How many gallons are in a cup?

1 cup is 0.0625 gallons, from the exact unit definitions (NIST SP 811).

### How do I convert cups to gallons?

Multiply by 0.0625: gal = cup × 0.0625 (the same as cup ÷ 16). For example, 15.5 cups × 0.0625 = 0.96875 gal.

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

Multiply by 16, or type the gallons into the second box and the converter works it out. 1 gallon is 16 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