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gal (UK)
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What is a uk gallon?

The British imperial gallon — 20% larger than the US gallon

Definition

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.

Common uses

  • UK fuel economy in miles per gallon (UK mpg)
  • Older British industrial and brewing contexts
  • Commonwealth countries that retain imperial measures

🌍 Real-world scale

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.

Convert from UK gallons

14 conversions
UK Gallon to Liter1 gal (UK) = 4.54609 LUK Gallon to Milliliter1 gal (UK) = 4,546.09 mlUK Gallon to Cubic Meter1 gal (UK) = 0.004546 m³UK Gallon to US Gallon1 gal (UK) = 1.20095 gal (US)UK Gallon to Fluid Ounce1 gal (UK) = 153.722 fl ozUK Gallon to Cup1 gal (UK) = 18.942 cupUK Gallon to Pint1 gal (UK) = 9.6076 ptUK Gallon to Quart1 gal (UK) = 4.8038 qtUK Gallon to Tablespoon1 gal (UK) = 307.168 tbspUK Gallon to Teaspoon1 gal (UK) = 922.33 tspUK Gallon to Barrel1 gal (UK) = 0.02859 bblUK Gallon to Cubic Inch1 gal (UK) = 277.419 in³UK Gallon to Cubic Foot1 gal (UK) = 0.1605 ft³UK Gallon to Cubic Yard1 gal (UK) = 0.005946 yd³

Convert to UK gallons

14 conversions
Liter to UK Gallon1 L = 0.22 gal (UK)Milliliter to UK Gallon1 ml = 0.00022 gal (UK)Cubic Meter to UK Gallon1 m³ = 219.969 gal (UK)US Gallon to UK Gallon1 gal (US) = 0.8327 gal (UK)Fluid Ounce to UK Gallon1 fl oz = 0.006505 gal (UK)Cup to UK Gallon1 cup = 0.05279 gal (UK)Pint to UK Gallon1 pt = 0.1041 gal (UK)Quart to UK Gallon1 qt = 0.2082 gal (UK)Tablespoon to UK Gallon1 tbsp = 0.003256 gal (UK)Teaspoon to UK Gallon1 tsp = 0.001084 gal (UK)Barrel to UK Gallon1 bbl = 34.9723 gal (UK)Cubic Inch to UK Gallon1 in³ = 0.003605 gal (UK)Cubic Foot to UK Gallon1 ft³ = 6.22884 gal (UK)Cubic Yard to UK Gallon1 yd³ = 168.179 gal (UK)

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).

Common mistakes

  • 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.

FAQ about the uk gallon

What is a uk gallon?
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.
Where is the uk gallon used?
The uk gallon is commonly used for: UK fuel economy in miles per gallon (UK mpg); Older British industrial and brewing contexts; Commonwealth countries that retain imperial measures.
What is an example of a uk gallon in real life?
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.
What category does the uk gallon belong to?
The uk gallon is a unit of volume, part of the 15-unit volume category on UnitConv.
How accurate are uk gallon conversions?
All conversion factors follow NIST and BIPM international standards to 8 significant figures — the highest practical accuracy.
Explore all 15 volume units and their conversions.🧪 Volume hub →