How to convert US gallons to imperial gallons
gal (UK) = gal × 0.8326741846Multiply the value in US gallons by 0.8326741846. To go the other way, multiply by 1.200949926 (or divide by 0.8326741846).
An US gallon is smaller than an imperial gallon: it takes 1.200949926 US gallons to make one imperial gallon.
Worked examples
- 1 US gallon1 gal × 0.8326741846 = 0.8326741846 gal (UK)
- 5 US gallons5 gal × 0.8326741846 = 4.163370923 gal (UK)
- 10 US gallons10 gal × 0.8326741846 = 8.326741846 gal (UK)
- 20 US gallons20 gal × 0.8326741846 = 16.65348369 gal (UK)
- 100 US gallons100 gal × 0.8326741846 = 83.26741846 gal (UK)
US gallons to imperial gallons conversion table
Values are calculated by the conversion engine and rounded to 8 significant figures.
| US gallons (gal) | Imperial gallons (gal (UK)) |
|---|---|
| 0.1 gal | 0.083267418 gal (UK) |
| 0.25 gal | 0.20816855 gal (UK) |
| 0.5 gal | 0.41633709 gal (UK) |
| 1 gal | 0.83267418 gal (UK) |
| 2 gal | 1.6653484 gal (UK) |
| 3 gal | 2.4980226 gal (UK) |
| 4 gal | 3.3306967 gal (UK) |
| 5 gal | 4.1633709 gal (UK) |
| 6 gal | 4.9960451 gal (UK) |
| 7 gal | 5.8287193 gal (UK) |
| 8 gal | 6.6613935 gal (UK) |
| 9 gal | 7.4940677 gal (UK) |
| 10 gal | 8.3267418 gal (UK) |
| US gallons (gal) | Imperial gallons (gal (UK)) |
|---|---|
| 12 gal | 9.9920902 gal (UK) |
| 15 gal | 12.490113 gal (UK) |
| 20 gal | 16.653484 gal (UK) |
| 25 gal | 20.816855 gal (UK) |
| 30 gal | 24.980226 gal (UK) |
| 40 gal | 33.306967 gal (UK) |
| 50 gal | 41.633709 gal (UK) |
| 75 gal | 62.450564 gal (UK) |
| 100 gal | 83.267418 gal (UK) |
| 250 gal | 208.16855 gal (UK) |
| 500 gal | 416.33709 gal (UK) |
| 1,000 gal | 832.67418 gal (UK) |
About the units
US gallon (gal)
Defined as 231 cubic inches, exactly 3.785411784 L. US fuel, milk and paint are sold by the gallon. Four quarts or 128 US fluid ounces. One US gallon equals 0.003785411784 cubic meters (m³).
Imperial gallon (gal (UK))
Exactly 4.54609 L, about 1.2 US gallons. Used in the UK for fuel economy (mpg) figures. One imperial gallon equals 0.00454609 cubic meters (m³).
Frequently asked questions
How many imperial gallons are in one US gallon?
There are 0.8326741846 imperial gallons in one US gallon, and this value is exact by definition.
How do I convert US gallons to imperial gallons?
Multiply the number of US gallons by 0.8326741846. For example, 10 gal × 0.8326741846 = 8.326741846 gal (UK).
How many US gallons are in one imperial gallon?
One imperial gallon equals 1.200949926 US gallons. That is the reverse factor, 1 ÷ 0.8326741846.
What is 10 US gallons in imperial gallons?
10 gal = 8.326741846 gal (UK).
Is this gal to gal (UK) converter accurate?
Yes. Both units are defined exactly in terms of SI units, so the conversion factor is exact; results are shown to 12 significant figures by default and you can change precision in the converter. Calculations run in your browser using the same tested engine that generated this page.