---
title: "0.5 qt to gal = 0.125 gal"
description: "0.5 US quarts is 0.125 US gallons. The arithmetic, a table of nearby values, and a converter for any other number."
url: https://atoneplace.net/convert/0-5-quarts-to-gallons/
site: "At One Place"
---

# 0.5 qt to gal

**0.5 US quarts in US gallons: 0.5 qt = 0.125 gal**

gal = qt × 1/4

0.5 US quarts is 0.125 US gallons. To get there, multiply by 0.25.

## Values either side

*US quarts near 0.5, converted to US gallons.*

| US quarts | US gallons |
| --- | --- |
| 0.5 qt ← | 0.125 |
| 1 qt | 0.25 |
| 1.5 qt | 0.375 |
| 2 qt | 0.5 |
| 2.5 qt | 0.625 |

## How the conversion works

The relationship is gal = qt × 1/4. 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 0.5 qt in US gallons?

0.5 qt is 0.125 gal.

### How do you convert US quarts to US gallons?

Multiply by 0.25.

## Related pages

- [US quarts to US gallons](https://atoneplace.net/convert/quarts-to-gallons/)
- [0.5 gal to qt](https://atoneplace.net/convert/0-5-gallons-to-quarts/)
- [1 qt to gal](https://atoneplace.net/convert/1-quarts-to-gallons/)
- [1.5 qt to gal](https://atoneplace.net/convert/1-5-quarts-to-gallons/)
- [2 qt to gal](https://atoneplace.net/convert/2-quarts-to-gallons/)
- [2.5 qt to gal](https://atoneplace.net/convert/2-5-quarts-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/)