US gallons to Imperial gallons
1 US gallon = 0.83267 imperial gallons · 1 gal (UK) = 1.2009 gal (US)
1 US gallon = 0.83267 imperial gallons
How it’s calculated
gal (UK) = gal (US) × 0.8326741846
- Multiply the value in US gallons by 0.8326741846.
- To go back, divide by 0.8326741846 (or multiply by 1.200949926).
- 1 gal (US) = 0.8326741846 gal (UK) · 1 gal (UK) = 1.200949926 gal (US)
Show worked solutionFactor, unit cancellation and rounding, step by step
Find the conversion factor
By definition 1 gal (US) = 0.003785411784 m³ and 1 gal (UK) = 0.00454609 m³, so 1 gal (UK) = 1.20094992550485 gal (US). Source: NIST SP 811 / Handbook 44.
Multiply by the factor written as a fraction
Put gal (US) in the denominator so it cancels, leaving gal (UK).
Calculate (unrounded)
Round the answer
Rounded to 5 significant figures.
Answer: 0.83267 gal (UK)
1 gal (US) in other units
Batch convert gal (US) → gal (UK)
- 1 gal (US) = 0.83267 gal (UK)
- 5 gal (US) = 4.1634 gal (UK)
- 10 gal (US) = 8.3267 gal (UK)
- 25 gal (US) = 20.817 gal (UK)
Quick examples
- 1 US gallon = 0.83267 imperial gallons
- 5 US gallons = 4.1634 imperial gallons
- 10 US gallons = 8.3267 imperial gallons
- 25 US gallons = 20.817 imperial gallons
- 100 US gallons = 83.267 imperial gallons
About these units
US gallon (gal (US))
US customary
Exactly 231 in³ = 3.785 411 784 L.
1 gal (US) = 0.003785411784 m³
Source: NIST SP 811 / Handbook 44
Imperial gallon (gal (UK))
British imperial
Exactly 4.546 09 L. About 20% larger than the US gallon.
1 gal (UK) = 0.00454609 m³
Source: NIST SP 811 / Handbook 44
US gallons to imperial gallons conversion table
| US gallons (gal (US)) | Imperial gallons (gal (UK)) |
|---|---|
| 0.1 gal (US) | 0.083267 gal (UK) |
| 0.5 gal (US) | 0.41634 gal (UK) |
| 1 gal (US) | 0.83267 gal (UK) |
| 2 gal (US) | 1.6653 gal (UK) |
| 3 gal (US) | 2.498 gal (UK) |
| 4 gal (US) | 3.3307 gal (UK) |
| 5 gal (US) | 4.1634 gal (UK) |
| 6 gal (US) | 4.996 gal (UK) |
| 7 gal (US) | 5.8287 gal (UK) |
| 8 gal (US) | 6.6614 gal (UK) |
| 9 gal (US) | 7.4941 gal (UK) |
| 10 gal (US) | 8.3267 gal (UK) |
| 15 gal (US) | 12.49 gal (UK) |
| 20 gal (US) | 16.653 gal (UK) |
| 25 gal (US) | 20.817 gal (UK) |
| 30 gal (US) | 24.98 gal (UK) |
| 40 gal (US) | 33.307 gal (UK) |
| 50 gal (US) | 41.634 gal (UK) |
| 75 gal (US) | 62.451 gal (UK) |
| 100 gal (US) | 83.267 gal (UK) |
| 250 gal (US) | 208.17 gal (UK) |
| 500 gal (US) | 416.34 gal (UK) |
| 1,000 gal (US) | 832.67 gal (UK) |
Related conversions
Frequently asked questions
How do I convert US gallons to imperial gallons?
Use gal (UK) = gal (US) × 0.8326741846. Multiply the value in US gallons by 0.8326741846.
How many imperial gallons are in 1 US gallon?
1 US gallon (gal (US)) equals 0.83267 imperial gallons (gal (UK)); more precisely 0.8326741846.
How many US gallons are in 1 imperial gallon?
1 imperial gallon (gal (UK)) equals 1.2009 US gallons (gal (US)); more precisely 1.200949926.
What is 10 gal (US) in gal (UK)?
10 US gallons = 8.3267 imperial gallons.
Is the US gallon a US or a UK unit?
This converter uses the US customary US gallon. Exactly 231 in³ = 3.785 411 784 L. US and UK units with the same name can differ, so check which one your source uses.
Is the imperial gallon a US or a UK unit?
This converter uses the British imperial imperial gallon. Exactly 4.546 09 L. About 20% larger than the US gallon. US and UK units with the same name can differ, so check which one your source uses.
What is a US gallon?
Exactly 231 in³ = 3.785 411 784 L.
Formula: gal (UK) = gal (US) × 0.8326741846. Factors last reviewed 2026-10-27.