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Gas Mileage & Trip Cost Calculator

Calculate the fuel cost for a trip based on mileage, fuel price, and distance.

Planning a road trip? Use this calculator to estimate exactly how much fuel you will need and what it will cost. Works for miles per gallon (MPG) or kilometres per litre.

Gas Mileage & Trip Cost Calculator

Your Results

Enter your details to see results.

How This is Calculated

Formula:

Trip Cost = (Distance / MPG) * Price Per Gallon

Calculates total fuel cost by dividing travel distance by the vehicle's miles per gallon (MPG) efficiency, then multiplying by fuel price.

Sources & Assumptions: Fuel economy algorithms defined by the U.S. Department of Energy (FuelEconomy.gov).

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How to Use This Calculator

Enter the trip distance, your car’s fuel efficiency, and the current fuel price per gallon/litre.

  1. Distance — total trip distance in miles or km.
  2. Fuel Efficiency — your car’s MPG or km/L (check your car manual).
  3. Fuel Price — cost per gallon or litre at the pump.

Frequently Asked Questions

Where do I find my car’s MPG?

Check your car’s manual, the manufacturer’s website, or use a site like fueleconomy.gov (US) or the DVLA (UK).

How do I convert L/100km to MPG?

Divide 235.2 by your L/100km figure to get MPG.

Results are for informational purposes only and do not constitute financial advice. Always consult a qualified financial professional.