What This Converter Does
This tool converts a volume of fuel measured in liters into both US gallons and Imperial (UK) gallons. Because the two gallon definitions differ, the same number of liters gives two different gallon values — which is exactly why drivers, importers, and travelers need a converter that shows both at once.
How to Use It
Enter the fuel volume in liters and the calculator instantly returns the equivalent in US gallons (used in the United States) and Imperial gallons (used in the UK and some Commonwealth countries). Use the US value at American pumps and the Imperial value for older UK references.
The Formula Explained
One liter equals 0.264172 US gallons and 0.219969 Imperial gallons. These factors come from the exact definitions: a US gallon is 3.785411784 liters, while an Imperial gallon is 4.54609 liters. To convert, simply multiply your liter value by the matching factor:
$$\text{US gal} = \text{liters} \times 0.264172$$$$\text{Imp gal} = \text{liters} \times 0.219969$$
Worked Example
Suppose you fill up with 50 liters of fuel. Multiply by the US factor: $$50 \times 0.264172 = 13.21 \text{ US gallons}.$$ Multiply by the Imperial factor: $$50 \times 0.219969 = 11.00 \text{ Imperial gallons}.$$ So 50 liters is about 13.2 US gallons or 11.0 Imperial gallons.
FAQ
Why are US and Imperial gallons different? The US gallon (3.785 L) is based on the old English wine gallon, while the Imperial gallon (4.546 L) was standardized in the UK in 1824. The Imperial gallon is about 20% larger.
Which one should I use? Use US gallons for fuel in the United States and Imperial gallons for the UK. Always check which system a source uses to avoid errors.
Is this accurate for any liquid? Yes — the conversion is purely volume-based, so it works for fuel, water, or any liquid measured in liters.
