Sumwise

US gallons to imperial gallons

imperial gallons = US gallons × 0.83267418

Reverse: imperial gallons to US gallons

How to convert US gallons to imperial gallons

One US gallon is 0.83267418 imperial gallons, so multiply the number of US gallons by 0.83267418. For example, 20 US gallons is 20 × 0.83267418 = 16.653484 imperial gallons. To go back, divide by the same number, or multiply by 1.20095.

Quick estimate

Multiplying by about 0.8 gets within 3.9% 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.

US gallonsimperial gallons
1 gal0.83267418 impgal
2 gal1.665348 impgal
3 gal2.498023 impgal
4 gal3.330697 impgal
5 gal4.163371 impgal
6 gal4.996045 impgal
7 gal5.828719 impgal
8 gal6.661393 impgal
9 gal7.494068 impgal
10 gal8.326742 impgal
11 gal9.159416 impgal
12 gal9.99209 impgal
13 gal10.824764 impgal
14 gal11.657439 impgal
15 gal12.490113 impgal
16 gal13.322787 impgal
17 gal14.155461 impgal
18 gal14.988135 impgal
19 gal15.82081 impgal
20 gal16.653484 impgal
25 gal20.816855 impgal
30 gal24.980226 impgal
40 gal33.306967 impgal
50 gal41.633709 impgal
60 gal49.960451 impgal
70 gal58.287193 impgal
75 gal62.450564 impgal
80 gal66.613935 impgal
90 gal74.940677 impgal
100 gal83.267418 impgal
120 gal99.920902 impgal
150 gal124.901128 impgal
200 gal166.534837 impgal
250 gal208.168546 impgal
300 gal249.802255 impgal
400 gal333.069674 impgal
500 gal416.337092 impgal
750 gal624.505638 impgal
1,000 gal832.674185 impgal
1,500 gal1,249.01 impgal
2,000 gal1,665.35 impgal
5,000 gal4,163.37 impgal
10,000 gal8,326.74 impgal

Questions

How many imperial gallons are in a US gallon?

0.83267418 imperial gallons.

How do I convert US gallons to imperial gallons in a spreadsheet?

Put the value in A1 and type =A1*0.83267418, 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.