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Volume

Convert US gallons to UK gallons

1 gal (US)=0.8327gal (UK)

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

0.83267

Conversion formula

Forward
UK gallons = US gallons × 0.8327
Reverse
US gallons = UK gallons × 1.20095

Example: 10 gal (US) × 0.8327 = 8.32674 gal (UK).

About both units

From

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 →
To

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 to UK Gallon conversion table

Common US gallons to UK gallons values for quick reference.

US Gallon (gal (US))UK Gallon (gal (UK))
1 gal (US)0.8327 gal (UK)
2 gal (US)1.66535 gal (UK)
5 gal (US)4.16337 gal (UK)
10 gal (US)8.32674 gal (UK)
20 gal (US)16.6535 gal (UK)
50 gal (US)41.6337 gal (UK)
100 gal (US)83.2674 gal (UK)
200 gal (US)166.535 gal (UK)
500 gal (US)416.337 gal (UK)
1,000 gal (US)832.674 gal (UK)

Tips & common mistakes

Quick tips

  • 1 US gallon = 3.785 L = 128 US fluid ounces = 4 quarts.
  • Converting mpg (US) to L/100 km: 235.215 / mpg = L/100 km.
  • The US gallon is based on the old English Queen Anne wine gallon (1707).

Avoid these

  • Using UK gallons on a US fuel-economy figure — 30 mpg (US) = 36 mpg (UK).
  • Confusing US gallon (3.79 L) with UK gallon (4.55 L) — 20% difference.
  • Using "gallon" without qualifier in cross-Atlantic commerce.

Frequently asked questions

How many UK gallons in a us gallon?
One us gallon equals 0.8327 UK gallons.
How do I convert US gallons to UK gallons?
Multiply the us gallon value by 0.8327 to get the equivalent in UK gallons.
What is 100 US gallons in UK gallons?
100 US gallons equals 83.2674 UK gallons.
Is a us gallon bigger than a uk gallon?
No. 1 us gallon equals 0.8327 UK gallons, so one us gallon is smaller.
How to convert US gallons to UK gallons without a calculator?
Multiply by 0.83 for a quick estimate; use a calculator for precise results.

Related volume conversions

📊 See full comparison matrix →

More from US Gallon

gal (US) → L
1 = 3.78541 L
gal (US) → ml
1 = 3,785.41 ml
gal (US) → m³
1 = 0.003785 m³
gal (US) → fl oz
1 = 128 fl oz
gal (US) → cup
1 = 15.7725 cup
gal (US) → pt
1 = 8 pt
gal (US) → qt
1 = 4 qt
gal (US) → tbsp
1 = 255.771 tbsp

More to UK Gallon

L → gal (UK)
1 = 0.22 gal (UK)
ml → gal (UK)
1 = 0.00022 gal (UK)
m³ → gal (UK)
1 = 219.969 gal (UK)
fl oz → gal (UK)
1 = 0.006505 gal (UK)
cup → gal (UK)
1 = 0.05279 gal (UK)
pt → gal (UK)
1 = 0.1041 gal (UK)
qt → gal (UK)
1 = 0.2082 gal (UK)
tbsp → gal (UK)
1 = 0.003256 gal (UK)

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