Convert UK Gallons to US Gallons
Convert UK Gallons to US Gallons instantly. 1 UK Gallon (gal (UK)) equals 1.2009 US Gallons (gal (US)).
UK Gallons to US Gallons conversion table
| UK Gallons (gal (UK)) | US Gallons (gal (US)) |
|---|---|
| 1 gal (UK) | 1.2009 gal (US) |
| 2 gal (UK) | 2.4019 gal (US) |
| 3 gal (UK) | 3.6028 gal (US) |
| 5 gal (UK) | 6.0047 gal (US) |
| 10 gal (UK) | 12.0095 gal (US) |
| 20 gal (UK) | 24.019 gal (US) |
| 50 gal (UK) | 60.0475 gal (US) |
| 100 gal (UK) | 120.095 gal (US) |
| 500 gal (UK) | 600.475 gal (US) |
| 1,000 gal (UK) | 1,200.95 gal (US) |
1 UK Gallon = 1.2009 US Gallons · multiply UK Gallons by 1.2009
About converting UK Gallons to US Gallons
UK Gallons (gal (UK)) and US Gallons (gal (US)) are both units of volume, so converting between them is a single multiplication: multiply your UK Gallons figure by 1.2009. Ten UK Gallons comes to 12.0095 US Gallons, and a hundred works out at 120.095 US Gallons.
Rule of thumb: going from UK Gallons to US Gallons multiplies, so the figure always grows — one UK Gallon is already 1.2009 US Gallons. If your answer came out smaller, you have the conversion the wrong way round.
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.
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.
To put both in perspective: the UK gallon began as the volume of ten pounds of water, while a typical American milk jug holds one US gallon.
The converter above updates as you type, and the table lists common values for quick reference. Need the opposite direction? Use the US Gallons to UK Gallons converter, or browse all Volume converters.
Frequently asked questions
How many US Gallons are in one UK Gallon?
There are 1.2009 US Gallons in one UK Gallon.
How do I convert UK Gallons to US Gallons?
Multiply the number of UK Gallons by 1.2009. For example, 10 UK Gallons = 12.0095 US Gallons.
What is 100 UK Gallons in US Gallons?
100 UK Gallons is equal to 120.095 US Gallons.
How do I convert US Gallons to UK Gallons?
Multiply the US Gallons value by 0.8327 (or divide by 1.2009).
Is this UK Gallons to US Gallons conversion exact?
The definition is exact — UK Gallons and US 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 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.
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.