Fuel Cost Calculator
Estimate the total fuel cost for any road trip. Enter distance, MPG, and gas price to calculate gallons needed and total cost.
miles
MPG
$
Total Fuel Cost
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Gallons Needed —
Cost per 100 Miles —
How to Use This Calculator
- Enter the Distance of your trip in miles.
- Enter your vehicle's Fuel Efficiency in MPG.
- Enter the current Gas Price per gallon.
- The calculator shows total fuel cost, gallons needed, and cost per 100 miles.
Formula
Gallons Needed = Distance / Fuel Efficiency (MPG)
Total Fuel Cost = Gallons Needed × Gas Price
Example
Trip of 500 miles, car gets 30 MPG, gas costs $3.50/gallon.
- Gallons Needed = 500 / 30 = 16.67 gallons
- Total Cost = 16.67 × $3.50 = $58.33
Frequently Asked Questions
- Fuel Cost = (Distance / MPG) × Gas Price. For example, a 500-mile trip in a 30 MPG car at $3.50/gallon costs (500/30) × $3.50 = $58.33.
- Check your car's owner manual, the EPA window sticker, or fueleconomy.gov. You can also calculate it by dividing miles driven by gallons used at your last fill-up.
- Yes. Most vehicles are most efficient at 50–65 mph. Driving at 70–80 mph can reduce fuel efficiency by 15–25%, significantly increasing trip cost.
- This calculator uses miles and gallons. For metric: Fuel Cost = (Distance in km / L/100km) × Price per Liter.