Imperial gallons to US gallons
US gallons = imperial gallons × 1.20095
Reverse: US gallons to imperial gallons
How to convert imperial gallons to US gallons
One imperial gallon is 1.20095 US gallons, so multiply the number of imperial gallons by 1.20095. For example, 20 imperial gallons is 20 × 1.20095 = 24.018999 US gallons. To go back, divide by the same number, or multiply by 0.83267418.
Quick estimate
Multiplying by about 1.2 gets within 0.1% of the exact answer, which is enough to check that a result makes sense.
Where it comes up
Volume conversions come up in recipes, fuel economy, drink and bottle sizes, garden and pool water, and engine sizes.
| imperial gallons | US gallons |
|---|---|
| 1 impgal | 1.20095 gal |
| 2 impgal | 2.4019 gal |
| 3 impgal | 3.60285 gal |
| 4 impgal | 4.8038 gal |
| 5 impgal | 6.00475 gal |
| 6 impgal | 7.2057 gal |
| 7 impgal | 8.406649 gal |
| 8 impgal | 9.607599 gal |
| 9 impgal | 10.808549 gal |
| 10 impgal | 12.009499 gal |
| 11 impgal | 13.210449 gal |
| 12 impgal | 14.411399 gal |
| 13 impgal | 15.612349 gal |
| 14 impgal | 16.813299 gal |
| 15 impgal | 18.014249 gal |
| 16 impgal | 19.215199 gal |
| 17 impgal | 20.416149 gal |
| 18 impgal | 21.617099 gal |
| 19 impgal | 22.818049 gal |
| 20 impgal | 24.018999 gal |
| 25 impgal | 30.023748 gal |
| 30 impgal | 36.028498 gal |
| 40 impgal | 48.037997 gal |
| 50 impgal | 60.047496 gal |
| 60 impgal | 72.056996 gal |
| 70 impgal | 84.066495 gal |
| 75 impgal | 90.071244 gal |
| 80 impgal | 96.075994 gal |
| 90 impgal | 108.085493 gal |
| 100 impgal | 120.094993 gal |
| 120 impgal | 144.113991 gal |
| 150 impgal | 180.142489 gal |
| 200 impgal | 240.189985 gal |
| 250 impgal | 300.237481 gal |
| 300 impgal | 360.284978 gal |
| 400 impgal | 480.37997 gal |
| 500 impgal | 600.474963 gal |
| 750 impgal | 900.712444 gal |
| 1,000 impgal | 1,200.95 gal |
| 1,500 impgal | 1,801.42 gal |
| 2,000 impgal | 2,401.9 gal |
| 5,000 impgal | 6,004.75 gal |
| 10,000 impgal | 12,009.5 gal |
Questions
How many US gallons are in a imperial gallon?
1.20095 US gallons.
How do I convert imperial gallons to US gallons in a spreadsheet?
Put the value in A1 and type =A1*1.20095, then fill the formula down the column.
Are the values in the table exact?
They are calculated from the exact definitions of the units and rounded only for display. Open any row for the full working.