Convert Imperial gallons to US gallons
1 imperial gallon = 1.2009 US gallons · gal = imp gal × 1.200949926
When you need this conversion
This conversion goes from imperial gallons, the UK volume unit about 20 percent larger than a US gallon, to US gallons, the fuel and liquid volume unit in the US. Both measure the same physical quantity, so the conversion is exact — the difference is which unit your source, tool, or region happens to use.
Imperial gallons to US gallons conversion table
| Imperial gallons (imp gal) | US gallons (gal) |
|---|---|
| 1 imp gal | 1.2009 gal |
| 2 imp gal | 2.4019 gal |
| 3 imp gal | 3.6028 gal |
| 5 imp gal | 6.0047 gal |
| 10 imp gal | 12.0095 gal |
| 15 imp gal | 18.0142 gal |
| 20 imp gal | 24.019 gal |
| 25 imp gal | 30.0237 gal |
| 50 imp gal | 60.0475 gal |
| 75 imp gal | 90.0712 gal |
| 100 imp gal | 120.09 gal |
| 250 imp gal | 300.24 gal |
| 500 imp gal | 600.47 gal |
| 1,000 imp gal | 1,200.95 gal |
The formula
gal = imp gal × 1.200949926Because both units measure volume, the conversion is a single multiplication by a fixed factor. That factor never changes, so the result is exact.
Convert the other way
US gallons to imperial gallons →Related volume conversions
- Liters to US gallons
- Milliliters to US cups
- Milliliters to US fluid ounces
- Liters to cubic meters
- Cubic meters to liters
- Cubic meters to cubic feet
- Cubic feet to cubic meters
- US gallons to liters
- US cups to milliliters
- US fluid ounces to milliliters
- Milliliters to US gallons
- Cubic meters to US gallons
Frequently asked questions
- How many US gallons are in a imperial gallon?
- There are 1.2009 US gallons in 1 imperial gallon. The formula is gal = imp gal × 1.200949926.
- How do you convert imperial gallons to US gallons?
- Use the formula gal = imp gal × 1.200949926. For example, 10 imperial gallons equals 12.0095 US gallons.
- Is the imperial gallons to US gallons conversion exact?
- Yes. Imperial gallons and US gallons are both units of volume, related by an exact defined factor. Displayed results are rounded for readability.
- What is imp gal short for?
- imp gal is the standard symbol for imperial gallon. gal is the symbol for US gallon.