Imperial gallon to US gallon
Convert Imperial gallon (Imp gal) to US gallon (US gal).
Formula and method
result = value × (4.54609 ÷ 3.785411784).
The source value is converted to the catalog’s canonical unit, then expressed in the target unit.
Worked examples
These examples use the same conversion engine as the calculator.
- 1 Imp gal1.20094993 US gal
- 5 Imp gal6.00474963 US gal
- 10 Imp gal12.00949926 US gal
Common Imperial gallon values
| Imperial gallon (Imp gal) | US gallon (US gal) |
|---|---|
| 1 | 1.20094993 |
| 2 | 2.40189985 |
| 5 | 6.00474963 |
| 10 | 12.00949926 |
| 25 | 30.02374814 |
| 50 | 60.04749628 |
| 100 | 120.09499255 |
| 250 | 300.23748138 |
| 500 | 600.47496275 |
| 1,000 | 1,200.9499255 |
How to convert Imperial gallon to US gallon
- Enter a value in Imperial gallon in the converter above.
- The calculator converts it using the catalog’s linear method.
- Choose the decimal precision you need,then copy the displayed result if useful.
Frequently asked questions
What is the formula for Imperial gallon to US gallon?
result = value × (4.54609 ÷ 3.785411784). The source value is converted to the catalog’s canonical unit, then expressed in the target unit.
Can I convert US gallon back to Imperial gallon?
Yes. Use Swap Units when the reverse pair is available in the catalog. The page URL changes to the reverse conversion and the entered value is retained.
Why can a value be rejected?
The engine rejects non-finite values and negative values for units that do not allow them.
How are displayed decimal places chosen?
Use the Decimal precision selector above the result. Very large or very small results switch to scientific notation when that makes the value easier to read.