---
title: "20 fl oz to gal = 0.15625 gal"
description: "20 US fluid ounces is 0.15625 US gallons. The arithmetic, a table of nearby values, and a converter for any other number."
url: https://atoneplace.net/convert/20-fl-oz-to-gallons/
site: "At One Place"
---

# 20 fl oz to gal

**20 US fluid ounces in US gallons: 20 fl oz = 0.15625 gal**

gal = fl oz × 0.0078125

20 US fluid ounces is 0.15625 US gallons. To get there, multiply by 0.0078125.

## Values either side

*US fluid ounces near 20, converted to US gallons.*

| US fluid ounces | US gallons |
| --- | --- |
| 16 fl oz | 0.125 |
| 17 fl oz | 0.13281 |
| 18 fl oz | 0.14063 |
| 19 fl oz | 0.14844 |
| 20 fl oz ← | 0.15625 |
| 21 fl oz | 0.16406 |
| 22 fl oz | 0.17188 |
| 23 fl oz | 0.17969 |
| 24 fl oz | 0.1875 |

## How the conversion works

The relationship is gal = fl oz × 0.0078125. Both units measure volume, so the conversion is a fixed factor that never changes. The figure is exact rather than approximate: since the international yard and pound agreement of 1959, an inch is defined as exactly 25.4 millimetres and a pound as exactly 0.45359237 kilograms, and every other imperial and US customary unit here is derived from those two.

> US gallon: US liquid gallon. The imperial gallon is about 20% larger.

## Common questions

### What is 20 fl oz in US gallons?

20 fl oz is 0.15625 gal.

### How do you convert US fluid ounces to US gallons?

Multiply by 0.0078125.

## Related pages

- [US fluid ounces to US gallons](https://atoneplace.net/convert/fl-oz-to-gallons/)
- [20 gal to fl oz](https://atoneplace.net/convert/20-gallons-to-fl-oz/)
- [16 fl oz to gal](https://atoneplace.net/convert/16-fl-oz-to-gallons/)
- [17 fl oz to gal](https://atoneplace.net/convert/17-fl-oz-to-gallons/)
- [18 fl oz to gal](https://atoneplace.net/convert/18-fl-oz-to-gallons/)
- [19 fl oz to gal](https://atoneplace.net/convert/19-fl-oz-to-gallons/)
- [21 fl oz to gal](https://atoneplace.net/convert/21-fl-oz-to-gallons/)
- [22 fl oz to gal](https://atoneplace.net/convert/22-fl-oz-to-gallons/)
- [23 fl oz to gal](https://atoneplace.net/convert/23-fl-oz-to-gallons/)
- [24 fl oz to gal](https://atoneplace.net/convert/24-fl-oz-to-gallons/)

## Sources

- Guide for the Use of the International System of Units (SP 811) — NIST (https://www.nist.gov/pml/special-publication-811) [Public domain (US Government)]
- The International System of Units (SI Brochure) — Bureau International des Poids et Mesures (https://www.bipm.org/en/publications/si-brochure)
- Calculated on this page — At One Place (/about/)