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Fuel Cost Calculator

Total fuel cost for any trip from distance, consumption and price.

Buying a carStep 5 of 5

Best for: Budgeting a road trip, comparing two routes or vehicles, or splitting fuel costs.

Complete guide
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How it's calculated & sources
The Fuel Cost Calculator uses the standard formula for this calculation. It runs entirely in your browser, so your inputs are never uploaded. Figures are educational estimates, not professional advice — verify important decisions with a qualified expert. Last reviewed June 2026.

Free & no sign-up · runs entirely in your browser. Results are estimates for general information, not professional advice — verify important decisions with a qualified expert. Last reviewed June 2026.

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Complete guide

Quick answers

Short, sourced answers to the questions people (and AI assistants) ask most.

What is Fuel Cost?
A fuel cost calculator estimates what a trip or a period of driving costs in fuel, from the distance, your vehicle's fuel economy and the price of fuel.
Why does Fuel Cost matter?
An estimate of fuel spend. Real consumption varies with driving style, load, weather and traffic, and is usually a little worse than the rated figure.
How is Fuel Cost calculated?
Fuel used is distance divided by economy; cost is fuel used times the price. Economy is expressed as miles per gallon (higher is better) or litres per 100 km (lower is better), so make sure your distance, fuel and price units all match. Formula: Cost = (distance / fuel economy) x price per unit.
What are common fuel cost mistakes?
Mixing MPG and L/100km, which move in opposite directions.
When should you use the Fuel Cost Calculator?
Budgeting a road trip, comparing two routes or vehicles, or splitting fuel costs.

What is the Fuel Cost Calculator?

A fuel cost calculator estimates what a trip or a period of driving costs in fuel, from the distance, your vehicle's fuel economy and the price of fuel.

How the Fuel Cost Calculator works

Fuel used is distance divided by economy; cost is fuel used times the price. Economy is expressed as miles per gallon (higher is better) or litres per 100 km (lower is better), so make sure your distance, fuel and price units all match.

Cost = (distance / fuel economy) x price per unit

Trip fuel cost by distance and economy (at $3.50 / US gallon)

50$9$6$4
100$18$12$9
200$35$23$18
500$88$58$44

Worked example

A 300-mile trip at 30 MPG uses 10 gallons; at 3.50 per gallon that is about 35.

Common mistakes to avoid

  • Mixing MPG and L/100km, which move in opposite directions.
  • Using the rated economy when real-world figures are lower.
  • Forgetting the return leg of a round trip.
  • Applying highway economy to city driving or vice versa.

Keywords: fuel, cost, trip, gas.

Sources: US EPA / DOE — fueleconomy.gov

Reviewed by the Free Tools Galaxy editorial team · Updated June 2026 · Calculated privately in your browser.

Frequently asked questions

Is the Fuel Cost Calculator free to use?+

Yes. Every tool on Free Tools Galaxy is 100% free, runs in your browser and requires no signup.

How accurate is the Fuel Cost Calculator?+

Fuel Cost Calculator uses the standard fuel cost formula in double-precision arithmetic, so the same inputs always produce the same result and you can verify any figure by hand. It is an educational estimate — real-world outcomes depend on your actual rates, rules and assumptions.

Do you store my inputs?+

No. The Fuel Cost Calculator runs entirely in your browser. Nothing is uploaded or saved to a server.

Can I use the Fuel Cost Calculator on mobile?+

Yes — the interface is fully responsive and works on phones, tablets and desktops.

What are common mistakes to avoid?+

The most frequent mistake is mixing units. Double-check your inputs use a single, consistent unit before clicking Calculate.

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Total fuel cost for any trip from distance, consumption and price.

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