Fuel Cost Calculator
Estimate how much a trip will cost in fuel based on distance, fuel efficiency, and price per gallon.
Fill in the required fields to see your result.
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This is your estimated total fuel cost for the trip, based on the distance, fuel efficiency, and price per gallon you entered.
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How Trip Fuel Cost Is Calculated
Fuel cost for a trip depends on distance, your vehicle's fuel efficiency, and the price per gallon at the pump.
How to Calculate Fuel Cost
Gallons Needed = Distance ÷ MPG. Total Cost = Gallons Needed × Price per Gallon.
Fuel Cost Calculator Formula
- Gallons Needed = Distance ÷ Fuel Efficiency (MPG)
- Total Cost = Gallons Needed × Price per Gallon
Should I Use My Car's EPA MPG Rating?
You can, but your own real-world average MPG (calculated from your actual fill-ups) usually gives a more accurate estimate, since EPA ratings are measured under controlled conditions that don't always match real driving.
Fuel Cost Examples
400-mile trip, 28 MPG, $3.60/gallon: Gallons needed = 400 ÷ 28 ≈ 14.29. Total cost ≈ $51.43.
Common Fuel Cost Calculation Mistakes
Using your vehicle's EPA-rated MPG instead of your actual real-world average, which can differ meaningfully. Not accounting for the mix of highway and city driving on a specific trip, which affects real fuel efficiency. Forgetting fuel prices vary by region and change frequently — use a current, local price for the most accurate estimate.
How to Use This Calculator
Enter your trip distance, your vehicle's fuel efficiency in MPG, and the current price per gallon.
Formula & Methodology
Gallons Needed = Distance ÷ MPG. Total Cost = Gallons Needed × Price per Gallon.
Example: 300-mile trip, 30 MPG, $3.50/gallon
Gallons needed = 300 ÷ 30 = 10 gallons. Total cost = 10 × $3.50 = $35.00.
Uses a single, constant MPG figure for the whole trip — real fuel efficiency varies with speed, terrain, load, and driving style. Enter your vehicle's real-world average MPG for the most accurate estimate, not just its EPA rating.
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Frequently Asked Questions
- How is fuel cost calculated?
- Gallons needed = distance ÷ MPG, then multiplied by your entered price per gallon for the total cost.
- Should I use my car's EPA MPG rating?
- You can, but your real-world average MPG (from your own fill-ups) usually gives a more accurate estimate, since EPA ratings are measured under controlled conditions.
- Does this account for highway vs. city driving?
- No — it uses a single MPG figure for the whole trip. If your trip mixes highway and city driving, use a blended average MPG for the best estimate.
Last updated 7/15/2026