---
title: "US gallons to Imperial gallons — gal to imp gal converter"
description: "1 US gallon = 0.83267 imperial gallons. Convert US gallons to imperial gallons with a full conversion table, the exact formula, and a calculator for any value."
url: https://atoneplace.net/convert/gallons-to-imperial-gallons/
site: "At One Place"
---

# US gallons to imperial gallons

**1 US gallon in imperial gallons: 1 gal = 0.83267 imp gal**

imp gal = gal × 0.8326741846

To convert US gallons to imperial gallons, multiply by 0.8326741846. The table below gives the values people look up most often, and the converter works for any number.

## US gallons to imperial gallons table

*Common US gallon values converted to imperial gallons.*

| US gallons | Imperial gallons |
| --- | --- |
| 1 gal | 0.83267 |
| 2 gal | 1.665348 |
| 3 gal | 2.498023 |
| 4 gal | 3.330697 |
| 5 gal | 4.163371 |
| 10 gal | 8.326742 |
| 15 gal | 12.49011 |
| 20 gal | 16.65348 |
| 25 gal | 20.81685 |
| 30 gal | 24.98023 |
| 40 gal | 33.30697 |
| 50 gal | 41.63371 |
| 75 gal | 62.45056 |
| 100 gal | 83.26742 |
| 250 gal | 208.1685 |
| 500 gal | 416.3371 |
| 1,000 gal | 832.6742 |

## How the conversion works

The relationship is imp gal = gal × 0.8326741846. 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.

> Imperial gallon: UK gallon.

## Common questions

### How many imperial gallons are in one US gallon?

One US gallon equals 0.83267 imperial gallons. imp gal = gal × 0.8326741846.

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

Use imp gal = gal × 0.8326741846. So 10 gal is 8.326742 imp gal.

### How many US gallons are in one imperial gallon?

One imperial gallon equals 1.20095 US gallons, which is the reverse of the conversion above.

### Is there more than one kind of US gallon?

US liquid gallon. The imperial gallon is about 20% larger. UK gallon.

## Related pages

- [Imperial gallons to US gallons](https://atoneplace.net/convert/imperial-gallons-to-gallons/)
- [US gallons to Liters](https://atoneplace.net/convert/gallons-to-liters/)
- [US gallons to Milliliters](https://atoneplace.net/convert/gallons-to-ml/)
- [US gallons to Cubic meters](https://atoneplace.net/convert/gallons-to-cubic-meters/)
- [US gallons to US quarts](https://atoneplace.net/convert/gallons-to-quarts/)
- [US gallons to US pints](https://atoneplace.net/convert/gallons-to-pints/)
- [US gallons to US cups](https://atoneplace.net/convert/gallons-to-cups/)
- [US gallons to US fluid ounces](https://atoneplace.net/convert/gallons-to-fl-oz/)
- [US gallons to Tablespoons](https://atoneplace.net/convert/gallons-to-tablespoons/)
- [US gallons to Teaspoons](https://atoneplace.net/convert/gallons-to-teaspoons/)

## 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/)