Convert US Gallons to UK Gallons
Convert US Gallons to UK Gallons instantly. 1 US Gallon (gal (US)) equals 0.8327 UK Gallons (gal (UK)).
US Gallons to UK Gallons conversion table
| US Gallons (gal (US)) | UK Gallons (gal (UK)) |
|---|---|
| 1 gal (US) | 0.8327 gal (UK) |
| 2 gal (US) | 1.6653 gal (UK) |
| 3 gal (US) | 2.498 gal (UK) |
| 5 gal (US) | 4.1634 gal (UK) |
| 10 gal (US) | 8.3267 gal (UK) |
| 20 gal (US) | 16.6535 gal (UK) |
| 50 gal (US) | 41.6337 gal (UK) |
| 100 gal (US) | 83.2674 gal (UK) |
| 500 gal (US) | 416.3371 gal (UK) |
| 1,000 gal (US) | 832.6742 gal (UK) |
1 US Gallon = 0.8327 UK Gallons · multiply US Gallons by 0.8327
About converting US Gallons to UK Gallons
US Gallons (gal (US)) and UK Gallons (gal (UK)) are both units of volume, so converting between them is a single multiplication: multiply your US Gallons figure by 0.8327. Ten US Gallons comes to 8.3267 UK Gallons, and a hundred works out at 83.2674 UK Gallons.
Rule of thumb: going from US Gallons to UK Gallons divides, so the figure always shrinks — it takes about 1.2009 US Gallons to make a single UK Gallon. If your answer came out bigger, you have the conversion the wrong way round.
What is an US Gallon?
The US gallon is defined as exactly 231 cubic inches, a figure inherited unchanged from the old English wine gallon. When Britain overhauled its measures in 1824 and adopted a new imperial gallon, the United States simply kept the wine gallon it already had — and that single decision is the root of the entire US-versus-imperial mess that still catches people out today. The US gallon is roughly a fifth smaller than the imperial one, which means American and British fuel-economy figures are not comparable even though both are quoted in miles per gallon.
What is an UK Gallon?
The imperial gallon is defined as exactly 4.54609 liters, but it started as something far more tangible: the volume occupied by ten pounds of water. Britain adopted it in the 1824 reform that swept away a tangle of older gallons — wine, ale and corn measures each had their own — and much of the Commonwealth followed. It is noticeably larger than the US gallon that America retained, so a British car advertised at 50 miles per gallon is genuinely more frugal than an American one quoting the same number. It survives today mainly in fuel-economy figures, since UK forecourts sell petrol by the liter.
To put both in perspective: a typical American milk jug holds one US gallon, while the UK gallon began as the volume of ten pounds of water.
The converter above updates as you type, and the table lists common values for quick reference. Need the opposite direction? Use the UK Gallons to US Gallons converter, or browse all Volume converters.
Frequently asked questions
How many UK Gallons are in one US Gallon?
There are 0.8327 UK Gallons in one US Gallon.
How do I convert US Gallons to UK Gallons?
Multiply the number of US Gallons by 0.8327. For example, 10 US Gallons = 8.3267 UK Gallons.
What is 100 US Gallons in UK Gallons?
100 US Gallons is equal to 83.2674 UK Gallons.
How do I convert UK Gallons to US Gallons?
Multiply the UK Gallons value by 1.2009 (or divide by 0.8327).
Is this US Gallons to UK Gallons conversion exact?
The definition is exact — US Gallons and UK Gallons are both fixed against the same base by international agreement — but the decimal shown here is rounded for readability, because the true ratio does not terminate. For engineering or scientific work, carry more decimal places than this page displays.
What is an US Gallon?
The US gallon is defined as exactly 231 cubic inches, a figure inherited unchanged from the old English wine gallon. When Britain overhauled its measures in 1824 and adopted a new imperial gallon, the United States simply kept the wine gallon it already had — and that single decision is the root of the entire US-versus-imperial mess that still catches people out today. The US gallon is roughly a fifth smaller than the imperial one, which means American and British fuel-economy figures are not comparable even though both are quoted in miles per gallon.
What is an UK Gallon?
The imperial gallon is defined as exactly 4.54609 liters, but it started as something far more tangible: the volume occupied by ten pounds of water. Britain adopted it in the 1824 reform that swept away a tangle of older gallons — wine, ale and corn measures each had their own — and much of the Commonwealth followed. It is noticeably larger than the US gallon that America retained, so a British car advertised at 50 miles per gallon is genuinely more frugal than an American one quoting the same number. It survives today mainly in fuel-economy figures, since UK forecourts sell petrol by the liter.