US Gallons to UK Gallons Converter

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Convert US gallons to UK imperial gallons. The UK gallon (4.54609 L) is about 20 % larger than the US gallon (3.785 L), so 1 US gal ≈ 0.8327 UK gal; 5 US gal ≈ 4.16 UK gal; 10 US gal ≈ 8.33 UK gal. Critical when comparing US fuel-economy figures (mpg US) against UK quotes (mpg UK), where the same car will read differently in each system. Browser-local.

Gallon (US)
Gallon (UK)

Gallon (US) → Gallon (UK)

Quick reference table

Gallon (US)Gallon (UK)
1 gal (US)0.8327 gal (UK)
2 gal (US)1.6653 gal (UK)
5 gal (US)4.1634 gal (UK)
10 gal (US)8.3267 gal (UK)
25 gal (US)20.8169 gal (UK)
50 gal (US)41.6337 gal (UK)
100 gal (US)83.2674 gal (UK)

Glossary

US gallon

A US liquid gallon is exactly 231 cubic inches, or 3.785411784 L. It is the everyday US unit for fuel, milk, paint and bulk household liquids. One US gallon contains 4 quarts, 8 pints or 128 US fluid ounces. The UK imperial gallon (≈4.546 L) is about 20 % larger and is a different unit — always check which is meant.

UK (imperial) gallon

A UK imperial gallon is exactly 4.54609 L or 277.4194 cubic inches — about 20 % larger than the US gallon (3.785 L). Used in the United Kingdom and a few Caribbean countries for fuel economy figures (miles per UK gallon) and historical recipes. One UK imperial gallon equals 8 UK pints or 160 UK fluid ounces.

Metric / SI volume

In the metric system, volume is reported in liters (everyday) or cubic meters (industrial), with millilters for fine resolution. The relations are exact powers of ten: 1 m³ = 1,000 L = 1,000,000 ml, and 1 ml = 1 cm³. The metric system is the standard worldwide for science, beverages, fuel in metric countries, and most modern recipes outside the United States.

Imperial / US Customary volume

US customary and UK imperial systems both use gallon, quart, pint and fluid ounce — but with different sizes. The US gallon is 3.785 L (128 US fl oz); the UK imperial gallon is 4.546 L (160 UK fl oz). Cooking units (tsp = 4.93 ml, tbsp = 14.79 ml, cup = 240 ml) follow the US standard in nearly all modern English-language recipes.

Related tools

UK Gallons to US Gallons
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Convert volumes — ml, L, m³, cups, tbsp, fl oz, US/UK gallons and pints