Instantly convert between litres (L), UK gallons (Imperial) and US gallons using official international conversion factors. Perfect for fuel economy, vehicle specifications, cooking, aquariums, boating and everyday volume conversions.
✔ Litres ⇄ UK & US gallons • ✔ Volume conversion • ✔ Instant results • ✔ Free converter
UK gallons (Imperial) and US gallons are different sizes. 1 UK gallon = 1.20095 US gallons.
Although both are called gallons, the UK (Imperial) gallon and the US gallon are different units of volume. Using the correct conversion is essential when comparing fuel economy, vehicle specifications, cooking measurements, or liquid capacities between countries.
The UK gallon is approximately 20% larger than the US gallon, which is why fuel economy figures (MPG) are usually higher in the UK than in the United States.
This Litres ⇄ Gallons Converter converts between litres (L), UK gallons (Imperial), and US gallons using official international conversion factors. Unlike many online converters, it supports all six common conversions:
It is ideal for fuel calculations, vehicle specifications, boating, aviation, cooking, aquariums, industrial storage, and everyday volume conversions.
UK gal = L ÷ 4.54609
L = UK gal × 4.54609
US gal = L ÷ 3.78541
L = US gal × 3.78541
Direct gallon conversions use these formulas:
| Litres | UK Gal | US Gal |
|---|---|---|
| 20 | 4.40 | 5.28 |
| 30 | 6.60 | 7.93 |
| 40 | 8.80 | 10.57 |
| 50 | 11.00 | 13.21 |
| 60 | 13.20 | 15.85 |
| 70 | 15.40 | 18.49 |
| 80 | 17.60 | 21.13 |
| 100 | 22.00 | 26.42 |
Compare UK and US MPG figures accurately.
Convert fuel tank capacities and manufacturer data.
Measure fuel and liquid storage capacities.
Convert liquid volumes for cooking and household tasks.
This converter automatically uses the correct conversion factors for every conversion, eliminating these common mistakes.
What is the difference between UK and US gallons?
A UK (Imperial) gallon equals 4.54609 litres, while a US gallon equals 3.78541 litres.
Which gallon is larger?
The UK gallon is approximately 20% larger than the US gallon.
Why is UK MPG higher than US MPG?
Because one UK gallon contains more fuel than one US gallon, the same vehicle will generally achieve a higher miles-per-gallon (MPG) figure in UK specifications.
Can I convert directly between UK and US gallons?
Yes. This converter includes direct UK ↔ US gallon conversions without converting to litres first.
Are these conversion factors official?
Yes. The calculator uses internationally recognised conversion factors for accurate and consistent results.
Convert seconds, minutes, hours, days, weeks and years instantly.
Convert kilograms, pounds and stones (kg, lb, st).
Convert centimetres, metres, inches and feet.
Convert mph, km/h, knots and metres per second.
Convert MPG to L/100km and litres per 100 kilometres.
Convert Celsius, Fahrenheit and Kelvin temperatures.
Convert litres, UK gallons and US gallons.
Convert PSI, Bar and kilopascals (kPa).
Convert metric and imperial length units.
Convert square metres, square feet, acres and hectares.
Quickly access our most popular calculators. Fast, accurate, and free — no signup required.
Browse essential calculators for finance, everyday maths, and scientific calculations — all in one place.
✔ Free • ✔ Fast • ✔ No signup required • ✔ No DATA collected
Built for personal use, now shared for free — simple, fast, and private calculators for everyone.
Last Updated: August 2026