Conversion
Us Gallons to imperial gallons
1 US gal = 0.832674 imp gal, derived from exact unit definitions.
—
Swap ⇆| US gal | imp gal |
|---|---|
| 1 US gal | 0.8327 imp gal |
| 5 US gal | 4.1634 imp gal |
| 10 US gal | 8.3267 imp gal |
| 55 US gal | 45.7971 imp gal |
| 100 US gal | 83.2674 imp gal |
| 275 US gal | 228.9854 imp gal |
| 500 US gal | 416.3371 imp gal |
| 1,000 US gal | 832.6742 imp gal |
Formula
imperial gallons = US gallons × 0.8326741846FAQ
How many imperial gallons in a US gallon?
1 US gal = 0.832674 imp gal. Multiply your US gallons value by 0.832674.
Is this exact?
Yes — these factors derive from exact definitions: 1 US gallon = 231 cubic inches, 1 imperial gallon = 4.54609 liters, 1 inch = 2.54 cm, 1 barrel = 42 US gallons.
Why do tank specs mix US gallons and imperial gallons?
US tank trade uses gallons and inches; engineering drawings and international suppliers use metric or cubic measures. This page bridges them without rounding drift.