Universal Gallon Converter
Convert between litres, UK Imperial gallons, and US gallons. Perfect for international fuel comparisons and travel planning.
Used by 5000+ users
Free to use • No registration required • Instant results
Volume Converter
Conversion Result
Volume Comparison Table
| Litres | UK Gallons | US Gallons | Common Use |
|---|---|---|---|
| 4.546 | 1.000 | 1.201 | 1 UK gallon |
| 3.785 | 0.833 | 1.000 | 1 US gallon |
| 50 | 11.0 | 13.2 | Typical car tank |
| 80 | 17.6 | 21.1 | Large SUV tank |
About Gallon Differences
There are two main types of gallons used worldwide, and the difference is significant:
- UK Imperial Gallon: 4.546 litres - used in the UK and some Commonwealth countries
- US Gallon: 3.785 litres - used in the United States
The UK gallon is about 20% larger than the US gallon, which means fuel efficiency figures (MPG) from these countries aren't directly comparable without conversion.
This converter helps you compare fuel capacities, understand international vehicle specs, and convert fuel efficiency measurements between different standards.
Frequently Asked Questions
What is Resolvo?
Resolvo is a UK-based platform that helps drivers appeal unfair parking tickets and PCNs. We provide free tools like this gallon converter alongside our expert parking ticket appeal services, helping you save money on both fuel costs and unjust parking fines.
What's the difference between UK and US gallons?
UK gallons (Imperial) are 4.546 litres while US gallons are 3.785 litres. UK gallons are about 20% larger, which affects fuel efficiency comparisons between countries.
Which gallon should I use for UK vehicles?
Use UK Imperial gallons for UK vehicles. UK MPG figures, fuel efficiency ratings, and tank capacities are based on Imperial gallons, not US gallons.
Why do US cars seem to have better MPG?
US MPG figures often appear higher because US gallons are smaller. A car getting 30 US MPG would only get about 25 UK MPG - the efficiency is the same, just measured differently.
How do I compare fuel efficiency internationally?
Convert to the same units first. Either convert both to L/100km, or make sure you're comparing like-for-like gallons. Our MPG to L/100km converter can help with this.
Which countries use which gallon?
UK, Ireland, and some Commonwealth countries use Imperial gallons. The US uses US gallons. Most other countries use litres and don't use gallons at all.
Is one gallon measurement more accurate?
Both are equally accurate when used correctly. The key is knowing which one you're working with and converting appropriately for comparisons.
Can I use this for other liquids besides fuel?
Yes, this converter works for any liquid volume conversion between litres, UK gallons, and US gallons - not just fuel.
How does this affect fuel prices?
When comparing fuel prices internationally, you must account for gallon differences. US prices per gallon appear cheaper partly because their gallons are smaller.
How does this relate to parking tickets?
While gallon conversion doesn't prevent parking tickets, Resolvo helps you save money on both international fuel calculations and appealing unfair parking fines.
Should I memorise the conversion factors?
The key ones are: 1 UK gallon = 4.546 litres, 1 US gallon = 3.785 litres. Or just bookmark this converter for easy reference!
How do I know if a car's MPG is UK or US?
UK car specs use Imperial MPG, US specs use US MPG. When comparing, convert to the same unit. US MPG figures appear 20% higher than UK MPG for the same efficiency.
What does MPG mean in different countries?
UK/Ireland: Imperial MPG (higher efficiency = higher number). US: US MPG (appears higher than UK). Europe: L/100km (higher efficiency = lower number). Always check which system is used.
How much bigger is a UK gallon than US gallon?
UK gallons are about 20% larger: 1 UK gallon = 4.546L vs 1 US gallon = 3.785L. This means UK MPG figures are about 20% lower than US MPG for the same car.
Which gallon does my car use for fuel efficiency?
UK-sold cars use Imperial gallons for MPG. US-sold cars use US gallons. When comparing international reviews, always check which gallon system is being used.
How do I convert US fuel economy to UK?
Multiply US MPG by 0.833 to get UK MPG. Or divide US MPG by 1.201. For example: 30 US MPG = 25 UK MPG. Use our converter for precise results.