01
How the formula works
For km/L, fuel liters = distance ÷ economy. For L/100km, fuel liters = distance × consumption ÷ 100. For MPG, fuel gallons = distance ÷ MPG.
⛽ Fuel Cost Calculator
Estimate fuel cost for a commute, road trip, or long drive from distance, fuel economy, and fuel price.
Total fuel cost
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Fuel needed —
Cost per 100 km/mi —
Learn more
02
Why real costs vary
Traffic, highway speed, cargo load, air conditioning, tire pressure, and driving style can all shift real fuel use away from the official rating. Add a 10-15% buffer for long trips.
Frequently asked questions
Should I choose km/L or L/100km?
Choose km/L if your car reports distance per liter. Choose L/100km if your car reports liters consumed per 100 km.
Which gallon does MPG use?
This base calculator treats MPG as US miles per gallon. Convert first if you need UK MPG.
How do I calculate a round trip?
Enter the full round-trip distance, or calculate one way and multiply the result by 2.