Fuel Cost Calculator — Estimate Trip Cost by Distance and MPG
Calculate how much fuel a trip will cost. Supports MPG (US and UK), L/100 km, and km/L, with prices per gallon or liter. Great for road-trip budgeting.
Runs 100% in your browser — nothing is uploaded.
Frequently asked
US gallons and UK (imperial) gallons are different sizes — 1 UK gal ≈ 1.2 US gal. If your car's spec sheet says "40 MPG (UK)" and you're in the US, that's roughly 33 MPG (US). Pick the unit that matches what you're reading.
No — the tool uses whatever single efficiency figure you enter. For a realistic estimate, use your car's "combined" rating, or split a mixed trip into two calculations.
This calculator is for combustion vehicles. For EVs, use kWh/mi (or kWh/100km) and cost per kWh — mathematically the same idea, but the unit dropdowns don't currently list them.
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