Convert Imperial gallons to US gallons
1 imp gal = 1.20095 gal. Change the amount below, or read the formula and the reference table further down.
1 Imperial gallon equals
US gallons
1 imp gal = 1.20095 gal
The formula
Imperial gallons and US gallons both measure volume from the same zero, so a single multiplier does the job.
gal = imp gal × 1.20094993
Going the other way? Convert US gallons to Imperial gallons.
Imperial gallons to US gallons table
Common values, rounded for reading.
| Imperial gallons (imp gal) | US gallons (gal) |
|---|---|
| 1 | 1.2009 |
| 2 | 2.4019 |
| 3 | 3.6028 |
| 4 | 4.8038 |
| 5 | 6.0047 |
| 6 | 7.2057 |
| 7 | 8.4066 |
| 8 | 9.6076 |
| 9 | 10.8085 |
| 10 | 12.0095 |
| 15 | 18.0142 |
| 20 | 24.019 |
| 25 | 30.0237 |
| 30 | 36.0285 |
| 40 | 48.038 |
| 50 | 60.0475 |
| 75 | 90.0712 |
| 100 | 120.09 |
| 250 | 300.24 |
| 500 | 600.47 |
| 1,000 | 1,200.95 |
Questions people ask
- How many US gallons are in a Imperial gallon?
- One Imperial gallon equals 1.20094993 US gallons.
- How do I convert Imperial gallons to US gallons by hand?
- Multiply the number of Imperial gallons by 1.20094993. For a rough check, 1.2 is close enough for most everyday use.
- What is 1 Imperial gallon in US gallons?
- 1 Imperial gallon is 1.20095 US gallons.
Calcuit generates this page from a unit table, so the factors here match every other page on the site.