Gallon (UK) to Gallon (US) Converter
Convert Gallon (UK) (gal (UK)) to Gallon (US) (gal) instantly. 1 gal (UK) = 1.20095 gal.
Volume Converter
40 units available
1 gal (UK) = 1.20095 gal
Formula:
gal = gal (UK) × 1.2009499255With your value: 1 gal (UK) = 1.20094993 gal
How big is that?
Everyday references on a logarithmic scale, all expressed in gallon (uk) so you can sanity-check the result.
Other Gallon (UK) to Gallon (US) conversions
Gallon (UK) to Gallon (US) Conversion Table
| Gallon (UK) (gal (UK)) | Gallon (US) (gal) |
|---|---|
| 0.5 | 0.600475 |
| 1 | 1.20095 |
| 2 | 2.4019 |
| 5 | 6.00475 |
| 10 | 12.009499 |
| 15 | 18.014249 |
| 20 | 24.018999 |
| 25 | 30.023748 |
| 50 | 60.047496 |
| 100 | 120.094993 |
| 250 | 300.237481 |
| 500 | 600.474963 |
| 1000 | 1,200.949926 |
Gallon (US) to Gallon (UK) Conversion Table
| Gallon (US) (gal) | Gallon (UK) (gal (UK)) |
|---|---|
| 0.5 | 0.416337 |
| 1 | 0.832674 |
| 2 | 1.665348 |
| 5 | 4.163371 |
| 10 | 8.326742 |
| 15 | 12.490113 |
| 20 | 16.653484 |
| 25 | 20.816855 |
| 50 | 41.633709 |
| 100 | 83.267418 |
| 250 | 208.168546 |
| 500 | 416.337092 |
| 1000 | 832.674185 |
Where these values come from
Every factor on this page is traced to the document that defines it. See the full provenance dataset or our methodology.
Gallon (UK) (gal (UK))
Volume
The imperial gallon is exactly 4.546 09 L (Weights and Measures Act 1985).
National Institute of Standards and Technology (US) · Reviewed 2026-07-01
Gallon (US) (gal)
Volume
The US liquid gallon is exactly 231 cubic inches = 3.785 411 784 L.
National Institute of Standards and Technology (US) · Reviewed 2026-07-01
How to Convert Gallon (UK) to Gallon (US)
To convert from Gallon (UK) (gal (UK)) to Gallon (US) (gal), multiply the value by 1.2009499255.
Formula: gal = gal (UK) × 1.2009499255
Reverse: gal (UK) = gal × 0.8326741846
Step-by-Step Example
- Start with your value in Gallon (UK). For example: 5 gal (UK)
- Multiply by the conversion factor: 5 x 1.2009499255
- The result is: 6.00475 gal
About Gallon (UK)
The imperial gallon equals exactly 4.54609 litres, about 20% larger than the US gallon — a frequent source of fuel-economy confusion.
Common uses: UK fuel figures, brewing, older recipes.
About Gallon (US)
The US gallon equals approximately 3.785 liters and is the standard unit for fuel and large liquid volumes in the United States.
Fun Fact: The US gallon is about 20% smaller than the imperial (UK) gallon.
Common uses: fuel (US), beverages, swimming pools.
Frequently Asked Questions
How many Gallon (US) are in 1 Gallon (UK)?
There are exactly 1.2009499255 Gallon (US) in 1 Gallon (UK). This means the conversion factor from Gallon (UK) to Gallon (US) is 1.2009499255.
What is the formula to convert Gallon (UK) to Gallon (US)?
The formula to convert Gallon (UK) to Gallon (US) is: gal = gal (UK) × 1.2009499255. For example, to convert 10 Gallon (UK) to Gallon (US), you would multiply 10 by 1.2009499255.
What is a Gallon (UK)?
The imperial gallon equals exactly 4.54609 litres, about 20% larger than the US gallon — a frequent source of fuel-economy confusion.
What is a Gallon (US)?
The US gallon equals approximately 3.785 liters and is the standard unit for fuel and large liquid volumes in the United States.
What are the common uses of Gallon (UK)?
The Gallon (UK) is commonly used in UK fuel figures, brewing, older recipes.
Related Volume Conversions
Cite this page
UnitConvertLab. (2026). Gallon (UK) to Gallon (US) converter. UnitConvertLab. Retrieved from https://unitconvertlab.com/convert/gallon_uk-to-gallon_us