All Fuel & Mileage tools
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MPG Calculator: Miles Per Gallon and Cost Per Mile
Turn miles and gallons into MPG, L/100 km, fuel cost and cost per mile.
About these tools
This section covers MPG, trip fuel cost and savings. Fuel is one of the biggest running costs you control. These calculators turn distance, price per gallon or litre and fuel economy into a clear trip or yearly cost so you can compare cars, routes and driving habits.
Every calculator is paired with a guide that explains the maths and what really moves your fuel economy, from tire pressure to speed.
Common questions
How do I calculate MPG?
Divide the miles driven by the gallons used between two full tank fill-ups. Repeat over several tanks for a reliable average.
Why is my real MPG lower than the sticker?
Tests are done in controlled conditions. Short trips, cold weather, high speed, roof racks and low tire pressure all reduce real-world economy.
Can I convert between MPG and L/100 km?
Yes. The unit converter section has a converter for that, because the two scales run in opposite directions.