📏 Imperial gallons to US gallons Converter
Convert imperial gallons (imp gal) to us gallons (gal) instantly, with the formula, a worked example and a conversion table.
Quick answer: 1 imperial gallon (imp gal) = 1.2009499 us gallons (gal). Formula: gal = imp gal × 1.2009499.
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Imperial gallons to US gallons Converter inputs
Result
Imperial gallons to US gallons conversion table
| Imperial gallons (imp gal) | US gallons (gal) |
|---|---|
| 0.1 imp gal | 0.12009499 gal |
| 0.5 imp gal | 0.60047496 gal |
| 1 imp gal | 1.2009499 gal |
| 2 imp gal | 2.4018999 gal |
| 3 imp gal | 3.6028498 gal |
| 5 imp gal | 6.0047496 gal |
| 10 imp gal | 12.009499 gal |
| 20 imp gal | 24.018999 gal |
| 25 imp gal | 30.023748 gal |
| 50 imp gal | 60.047496 gal |
| 100 imp gal | 120.09499 gal |
| 1,000 imp gal | 1,200.9499 gal |
Other volume conversions
imp gal to mLimp gal to Limp gal to m³imp gal to tspimp gal to tbspimp gal to fl ozimp gal to cupimp gal to ptimp gal to qtimp gal to gal
How to convert imperial gallons to us gallons
Multiply the number of imperial gallons by 1.2009499 to get us gallons: gal = imp gal × 1.2009499.
Example: 5 imp gal = 6.0047496 gal.
The imperial gallon (imp gal) and the us gallon (gal) are both units of volume. Need the opposite direction? Use the gal to imp gal converter.
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Metric and imperial units
The metric system (SI) is used by almost every country and by science worldwide. Its units scale by powers of ten – 1 kilometer is 1,000 meters, 1 meter is 100 centimeters – which makes conversions inside the system easy. The imperial and US customary systems (inches, feet, pounds, gallons) are still used daily in the United States and partly in the UK.
Since 1959 the inch has been defined as exactly 2.54 centimeters and the pound as exactly 0.45359237 kilograms, so conversions between the two systems are exact. Note that a US gallon (3.785 L) and an imperial gallon (4.546 L) are different – choose the right one above.
This converter covers 10 categories and 66 units: length, weight, temperature, volume, area, speed, time, data, energy, pressure.
Frequently asked questions
How many us gallons are in a imperial gallon?
1 imperial gallon = 1.2009499 us gallons.
How do I convert imperial gallons to us gallons?
Use the formula gal = imp gal × 1.2009499. For example, 5 imp gal = 6.0047496 gal.
How do I convert us gallons back to imperial gallons?
1 us gallon = 0.83267418 imperial gallons. Use the gal to imp gal converter linked on this page.
Are these conversions exact?
Yes – all factors use the internationally defined values (for example 1 inch = 2.54 cm exactly, 1 pound = 0.45359237 kg exactly). Results are rounded to 8 significant digits for display.