Imperial gallon to US gallon Converter
Type a value — the answer appears instantly. 1 gal (UK) = 1.20095 gal.
Reviewed by the OmniCalc teamMethod verified 2026-07-01
1.20095 US gallons
= 4.54609 L= 4,546.09 ml
equals 1.20095 US gallonsFormula: gal = gal (UK) × 1.2009499
Imperial gallon to US gallon formula
gal = gal (UK) × 1.2009499
Convert 5 imperial gallons to US gallons
- Start with 5 imperial gallons.
- Multiply by the conversion factor: 5 × 1.20095 = 6.00475.
- So 5 gal (UK) = 6.00475 gal.
Imperial gallon to US gallon conversion table
| Imperial gallons (gal (UK)) | US gallons (gal) |
|---|---|
| 0.01 gal (UK) | 0.0120095 gal |
| 0.1 gal (UK) | 0.120095 gal |
| 0.25 gal (UK) | 0.300237 gal |
| 0.5 gal (UK) | 0.600475 gal |
| 1 gal (UK) | 1.20095 gal |
| 2 gal (UK) | 2.4019 gal |
| 3 gal (UK) | 3.60285 gal |
| 4 gal (UK) | 4.8038 gal |
| 5 gal (UK) | 6.00475 gal |
| 6 gal (UK) | 7.2057 gal |
| 7 gal (UK) | 8.40665 gal |
| 8 gal (UK) | 9.6076 gal |
| 9 gal (UK) | 10.8085 gal |
| 10 gal (UK) | 12.0095 gal |
| 15 gal (UK) | 18.0142 gal |
| 20 gal (UK) | 24.019 gal |
| 25 gal (UK) | 30.0237 gal |
| 30 gal (UK) | 36.0285 gal |
| 40 gal (UK) | 48.038 gal |
| 50 gal (UK) | 60.0475 gal |
| 75 gal (UK) | 90.0712 gal |
| 100 gal (UK) | 120.095 gal |
| 250 gal (UK) | 300.237 gal |
| 500 gal (UK) | 600.475 gal |
| 1,000 gal (UK) | 1,200.95 gal |
| 5,000 gal (UK) | 6,004.75 gal |
| 10,000 gal (UK) | 12,009.5 gal |
Unit definitions
What is a imperial gallon?
The imperial (UK) gallon is defined as exactly 4.54609 litres. It is used for fuel economy and liquid volumes in the United Kingdom and some Commonwealth countries. It is larger than the US gallon.
What is a US gallon?
The US gallon is defined as exactly 231 cubic inches, or 3.785411784 litres. It is the standard unit for fuel, milk, and large liquid quantities in the United States. It is about 20% smaller than the imperial gallon.
Frequently asked questions
How many US gallons are in one imperial gallon?
One imperial gallon equals 1.20095 US gallons (1 gal (UK) = 1.20095 gal).
How do I convert imperial gallons to US gallons?
Multiply the value in imperial gallons by 1.20095. For example, 10 gal (UK) × 1.20095 = 12.0095 gal.
Which is bigger — a imperial gallon or a US gallon?
A imperial gallon is bigger: one imperial gallon contains 1.20095 US gallons.
Is this imperial gallon to US gallon converter free?
Yes — the converter is free, works offline once loaded, and computes instantly in your browser without sending your numbers to a server.
Conversion factors follow international definitions (SI / NIST). Last verified 2026-07-01.