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US Gallons to UK Gallons (gal to imp gal) Converter

1 US gallon (gal) = 0.832674 UK gallons (imp gal). To convert US gallons to UK gallons, multiply by 0.832674: 15 gal × 0.832674 = 12.4901 imp gal. Also searched as US gallon to imperial gallon, US vs UK gallon.

1 gal = 0.8326741846 imp gal
Convert the other way: UK Gallons to US Gallons

Quick facts

How to convert US gallons to UK gallons

  1. Take the value in US gallons.
  2. Multiply it by 0.832674 (the number of UK gallons in one US gallon).
  3. Round the result to the precision you need.
imp gal = gal × 0.832674

Worked example (a car fuel tank): 15 gal × 0.832674 = 12.4901 imp gal.

To convert UK gallons back to US gallons, multiply by 1.20095, or divide by 0.832674.

Source: NIST Handbook 44, Appendix C, and NIST SP 811 (US customary volume units).

US Gallons to UK Gallons conversion table

US Gallons to UK Gallons conversion table
US Gallons [gal]UK Gallons [imp gal]
0.01 gal0.0083267418 imp gal
0.1 gal0.0832674185 imp gal
1 gal0.8326741846 imp gal
2 gal1.6653483693 imp gal
3 gal2.4980225539 imp gal
5 gal4.1633709231 imp gal
10 gal8.3267418463 imp gal
20 gal16.6534836926 imp gal
50 gal41.6337092314 imp gal
100 gal83.2674184629 imp gal
1000 gal832.674184629 imp gal

gal to imp gal chart from 1 to 100

UK Gallons to US Gallons conversion table

UK Gallons to US Gallons conversion table
UK Gallons [imp gal]US Gallons [gal]
0.01 imp gal0.0120094993 gal
0.1 imp gal0.1200949926 gal
1 imp gal1.2009499255 gal
2 imp gal2.401899851 gal
3 imp gal3.6028497765 gal
5 imp gal6.0047496275 gal
10 imp gal12.009499255 gal
20 imp gal24.0189985101 gal
50 imp gal60.0474962752 gal
100 imp gal120.0949925505 gal
1000 imp gal1200.9499255049 gal

US Gallons vs UK Gallons

US GallonUK Gallon
Symbolgalimp gal
Equals1 gal = 0.832674 imp gal1 imp gal = 1.20095 gal

What is a US gallon?

A US customary unit equal to 4 quarts. Used in the US for fuel, milk, and paint.

What is a UK gallon?

The imperial gallon, defined as exactly 4.54609 litres (UK Weights and Measures Act 1985); about 20% larger than the US gallon. Used in the UK and Canada for fuel economy (miles per gallon), garden and aquarium volumes, and older fuel prices.

Frequently asked questions

How many UK gallons are in a US gallon?

There are 0.832674 UK gallons in 1 US gallon (1 gal = 0.8326741846 imp gal).

How many US gallons are in a UK gallon?

There are 1.20095 US gallons in 1 UK gallon (1 imp gal = 1.2009499255 gal).

How do I convert US gallons to UK gallons?

Multiply the number of US gallons by 0.832674. For example, 10 gal × 0.832674 = 8.32674 imp gal. To convert back, multiply by 1.20095.

What is 10 gal in UK gallons?

10 gal = 8.32674 imp gal.

What is 100 gal in UK gallons?

100 gal = 83.2674 imp gal.

Is the conversion exact?

Yes. The factor comes from the official definitions of both units (NIST Handbook 44, Appendix C, and NIST SP 811 (US customary volume units)). Results are shown to up to 10 decimal places; round them to suit your purpose.

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Reviewed by

Dr. Muhammad Amjad Khadim PhD Mathematics

Dr. Muhammad Amjad Khadim holds a PhD in Mathematics. He writes and reviews the guides on pakmath.com and checks every formula, conversion factor and worked example against published standards and official guidance before it goes live. Spotted an error? Tell us and it will be corrected.

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First published 28 October 2026 · Last reviewed 5 November 2026