US gallons (gal) to UK gallons (imp gal) Conversion
US gallons
The US liquid gallon is a unit of volume equal to exactly 3.785411784 litres, used primarily in the United States for fuel sales, beverage containers, and agricultural applications. It is divided into 4 quarts, 8 pints, or 128 fluid ounces. The US gallon is approximately 16.7% smaller than the imperial (UK) gallon — a difference with significant implications in fuel economy comparisons and recipe conversions.
UK gallons
The UK imperial gallon is a unit of volume equal to exactly 4.54609 litres, defined by the UK Weights and Measures Act 1985. It is approximately 20% larger than the US liquid gallon. The imperial gallon is still used in the United Kingdom, Ireland, and several Commonwealth countries for fuel sales, and in aviation for fuel loading in older aircraft. Four imperial quarts, eight imperial pints, or 160 imperial fluid ounces make one imperial gallon.
| US gallons (gal) | UK gallons (imp gal) |
|---|---|
| 0.1 gal | 0.0833 imp gal |
| 1 gal | 0.8327 imp gal |
| 2 gal | 1.6653 imp gal |
| 3 gal | 2.498 imp gal |
| 5 gal | 4.1634 imp gal |
| 10 gal | 8.3267 imp gal |
| 20 gal | 16.6535 imp gal |
| 30 gal | 24.9802 imp gal |
| 50 gal | 41.6337 imp gal |
| 100 gal | 83.2674 imp gal |
| 1000 gal | 832.6742 imp gal |
Frequently Asked Questions (FAQ)
How many UK gallons are in 1 US gallons?
1 US gallons (gal) is exactly 0.832674 UK gallons (imp gal).
How do I convert US gallons to UK gallons?
Multiply the value in US gallons by 0.832674 to get the result in UK gallons. Or use the converter above — type any number and see the result instantly.