Convert UK gallons to US gallons

1 gal (UK)=1.20095gal (US)

Use the converter below to change any UK gallons value into US gallons instantly — with formula, conversion table, and real-world examples.

You have

Equals

1.20095

Conversion formula

Forward

US gallons = UK gallons × 1.20095

Reverse

UK gallons = US gallons × 0.8327

Example: 10 gal (UK) × 1.20095 = 12.0095 gal (US).

About both units

From

UK Gallon

gal (UK)

The UK imperial gallon equals 4.54609 litres exactly. Defined in 1824 as the volume of 10 pounds of water at 62 °F. Still used for fuel economy reporting in the UK and some older industrial contexts. The UK imperial gallon is about 20% larger than the US gallon.

Real-world: UK petrol sold by litre since 1995, but economy is quoted in UK mpg: a diesel car at 60 mpg (UK) uses 4.7 L/100 km.

Read full uk gallon reference →

US Gallon

gal (US)

The US gallon equals 3.785411784 litres exactly. It is the standard fuel and liquid volume unit in the United States. A typical American car holds 14–18 US gallons of fuel. US fuel economy is quoted in miles per US gallon (mpg).

Real-world: US car tank ≈ 15 gallons (57 L). 1 US gallon of milk is a common grocery size (3.79 L). US paint often sold by the gallon.

Read full us gallon reference →

UK Gallon to US Gallon conversion table

Common UK gallons to US gallons values for quick reference.

UK Gallon (gal (UK))	US Gallon (gal (US))
1 gal (UK)	1.20095 gal (US)
2 gal (UK)	2.4019 gal (US)
5 gal (UK)	6.00475 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)
200 gal (UK)	240.19 gal (US)
500 gal (UK)	600.475 gal (US)
1,000 gal (UK)	1,200.95 gal (US)

Tips & common mistakes

Quick tips

1 UK gallon = 4.54609 L exactly = 160 UK fluid ounces.
1 UK gallon ≈ 1.201 US gallons.
UK mpg × 0.832 = US mpg (same car, different unit).

Avoid these

Comparing UK mpg with US mpg directly — UK figures are about 20% higher for the same car.
Using 4.5 L instead of 4.546 L for precise conversion.
Assuming modern UK car ads quote US gallons — they always use UK gallons.

Frequently asked questions

How many US gallons in a uk gallon?

One uk gallon equals 1.20095 US gallons.

How do I convert UK gallons to US gallons?

Multiply the uk gallon value by 1.20095 to get the equivalent in US gallons.

What is 100 UK gallons in US gallons?

100 UK gallons equals 120.095 US gallons.

Is a uk gallon bigger than a us gallon?

Yes. 1 uk gallon equals 1.20095 US gallons, so one uk gallon is larger.

How to convert UK gallons to US gallons without a calculator?

Multiply by 1.2 for a quick estimate; use a calculator for precise results.

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