Convert Imperial Gallon to US Gallon
Use this free converter to change imperial gallons (imp gal) into us gallons (gal). Imperial gallon and us gallon both measure volume. As a quick reference, 1 imp gal equals 1.2009499 gal, and 1 gal equals 0.83267418 imp gal.
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US Gallon (gal)
1.2009499
1 imp gal = 1.2009499 gal
Volume conversion table
| Imperial Gallon | US Gallon |
|---|---|
| 0.01 | 0.012009499 |
| 0.1 | 0.12009499 |
| 0.5 | 0.60047496 |
| 1 | 1.2009499 |
| 2 | 2.4018999 |
| 3 | 3.6028498 |
| 5 | 6.0047496 |
| 10 | 12.009499 |
| 20 | 24.018999 |
| 25 | 30.023748 |
| 50 | 60.047496 |
| 100 | 120.09499 |
| 1,000 | 1200.9499 |
How to convert Imperial Gallon to US Gallon
Multiply the imperial gallon value by 1.2009499 to get us gallons.
- Enter the number of imperial gallons you want to convert.
- The converter instantly shows the equivalent value in us gallons.
- Worked example: 15 imp gal × 1.2009499 = 18.014249 gal.
- Use the swap button to reverse the conversion (us gallon to imperial gallon).
About these units
Imperial Gallon (imp gal)
- Definition
- An imperial gallon (imp gal) equals about 4.546 liters, roughly 20% larger than the US gallon.
- History
- It was defined in the UK in 1824 as the volume of ten pounds of water at a set temperature.
- Current use
- Imperial gallons are still used in the UK and some Commonwealth countries, often for fuel economy.
US Gallon (gal)
- Definition
- A US gallon (gal) is a unit of volume equal to 3.785411784 liters, or 128 US fluid ounces.
- History
- It is based on the old English wine gallon of 231 cubic inches, adopted by the United States.
- Current use
- US gallons measure fuel, milk, and paint in the United States.
Frequently asked questions
How many us gallons are in a imperial gallon?
There are 1.2009499 gal in 1 imp gal. To convert, multiply the number of imperial gallons by 1.2009499.
How do I convert imperial gallons to us gallons?
Multiply the imperial gallon value by 1.2009499 to get us gallons. For example, 10 imp gal = 12.009499 gal.
Is this imperial gallon-to-us gallon converter free?
Yes. This converter is completely free, runs entirely in your browser, and requires no sign-up. Your inputs never leave your device.
Convert Imperial Gallon to other volume units
| Unit | 1 Imperial Gallon equals |
|---|---|
| Liter (L) | 4.54609 L |
| Milliliter (mL) | 4546.09 mL |
| Cubic Meter (m³) | 0.00454609 m³ |
| Cubic Centimeter (cm³) | 4546.09 cm³ |
| US Gallon (gal) | 1.2009499 gal |
| US Quart (qt) | 4.8037997 qt |
| US Pint (pt) | 9.6075994 pt |
| US Cup (cup) | 19.215199 cup |
| US Fluid Ounce (fl oz) | 153.72159 fl oz |
| Tablespoon (tbsp) | 307.44318 tbsp |
| Teaspoon (tsp) | 922.32954 tsp |