Global Fuel Calculator
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Calculators
Understanding fuel economy
Four measurements dominate worldwide, and they do not agree with each other. Litres per 100 kilometres is the European and Canadian standard, where a lower number means a more efficient vehicle. Kilometres per litre is used across South Asia, Japan and much of the Middle East, and works the other way round — higher is better. Miles per gallon is used in the United States and the United Kingdom, but with two different gallons, so the same car reads about twenty percent higher in British figures than American ones.
That last point causes more confusion than anything else in this field. The US liquid gallon is 3.785411784 litres; the imperial gallon is 4.54609 litres. Any MPG figure quoted without saying which gallon it uses is effectively unusable for comparison. Every calculator here keeps the two strictly separate and labels which is which.
| Unit | Used in | Direction | Example |
|---|---|---|---|
| L/100km | Europe, Canada, Australia | Lower is better | 8.0 L/100km |
| km/L | Pakistan, India, Japan, Gulf | Higher is better | 12.50 km/L |
| MPG (US) | United States | Higher is better | 29.40 MPG |
| MPG (imperial) | United Kingdom | Higher is better | 35.31 MPG |
All four rows above describe exactly the same vehicle consuming exactly the same fuel over exactly the same distance.
Common questions
How do I measure my fuel consumption accurately?
Fill the tank to the automatic cut-off, reset the trip meter, drive normally for a few hundred kilometres or miles, then fill to cut-off again at the same pump. Distance divided by fuel added is your true figure. Averaging three or four consecutive tanks removes most of the remaining noise.
Is a US gallon the same as an imperial gallon?
No. A US gallon is 3.785411784 litres and an imperial gallon is 4.54609 litres, a difference of about twenty percent. An unlabelled MPG figure is therefore ambiguous, which is why this site always states which gallon a result uses.
Why does the calculator show four different economy units?
Because different markets use different standards and travellers, importers and car buyers frequently need to compare across them. Showing L/100km, km/L, US MPG and imperial MPG from one input removes the conversion step where mistakes normally happen.
Do I need to pick my country?
Not strictly — the global calculators work with any combination of units. Country pages simply arrive pre-configured with local units, currency and an indicative fuel price, which saves a few clicks and reduces the chance of picking the wrong gallon.
Are my figures stored or sent anywhere?
No. Every calculation runs in your own browser. Nothing you type is transmitted to a server or saved.
How accurate are the default fuel prices?
They are indicative starting points only and go out of date quickly, since most countries revise prices daily, fortnightly or monthly. Always overwrite the price field with the rate from your own receipt.