Liters to Gallons Converter
Convert between liters and gallons — with US and UK gallons shown side by side, because they differ by 20% and mixing them up is the most common fuel-math mistake there is.
How to use this calculator
- Enter the volume.
- Pick whether it's in liters, US gallons or UK gallons.
- Press Convert to see all three side by side.
Formula used
The US gallon is the old 231-cubic-inch wine gallon; the imperial gallon was defined in 1824 as the volume of 10 lb of water. The UK gallon is about 20% larger — critical when comparing fuel economy figures.
Example calculation
A 50-liter fuel tank holds 50 ÷ 3.785 = 13.21 US gallons or 50 ÷ 4.546 = 11.00 UK gallons.
US vs UK gallons — why it matters
Fuel economy is where this conversion bites: "miles per gallon" means different things in the US and UK because the gallons differ. A car rated 40 mpg (UK) achieves only about 33 mpg (US) — same car, different gallon.
Anchors: 1 L ≈ 0.264 US gal ≈ 0.22 UK gal; a typical 50 L tank ≈ 13.2 US gal; and fuel priced at 1.50/L equals about 5.68 per US gallon.
Why use this calculator?
- Compare fuel prices per liter vs per gallon across countries.
- Convert mpg figures correctly by using the right gallon.
- Both gallons always displayed — no silent wrong-unit errors.
Frequently asked questions
How many liters in a gallon?
3.785 liters in a US gallon; 4.546 liters in a UK (imperial) gallon. Always check which gallon a figure uses — they differ by 20%.
How do I convert fuel price per liter to per gallon?
Multiply the per-liter price by 3.785 for US gallons (or 4.546 for UK). Fuel at 1.60/L ≈ 6.06 per US gallon.
Why do UK cars quote higher mpg than US cars?
The imperial gallon is bigger, so the same car covers more miles per (UK) gallon. Multiply UK mpg by 0.833 to get US mpg.