UnitConImperial Gallons to Liters Converter
Convert imperial (UK) gallons to liters for fuel comparison, historical recipes, and understanding British and Commonwealth measurements. The imperial gallon is about 20% larger than the US gallon.
Formula
Multiply imperial gallons by 4.54609 to get liters. To reverse, divide liters by 4.54609 to get imperial gallons.
Quick reference
| Imperial Gallon (imp_gal) | Liter (L) |
|---|---|
| 1 | 4.54609 |
| 2 | 9.09218 |
| 5 | 22.73045 |
| 10 | 45.4609 |
| 15 | 68.19135 |
| 20 | 90.9218 |
| 30 | 136.3827 |
| 40 | 181.8436 |
| 50 | 227.3045 |
| 100 | 454.609 |
About these units
Imperial Gallon
The imperial gallon (277.42 cubic inches) was standardized in the UK in 1824 as the volume of 10 pounds of water at 62°F. It is still used in the UK for fuel tank capacity and in some Commonwealth countries for road fuel economy.
Liter
The liter is the metric unit for liquid volume. UK fuel economy (miles per imperial gallon) must be converted to liters for comparison with European L/100km figures.
Frequently asked questions
One imperial gallon = 4.54609 liters.
An imperial gallon is 4.546 L; a US gallon is 3.785 L. The imperial gallon is about 20% larger.
Because UK fuel economy uses the larger imperial gallon (4.546 L vs 3.785 L), a car achieving 40 UK mpg actually consumes more fuel per km than a US car rated at 40 US mpg.