About This Calculator
Use our free gas cost calculator to find out exactly how much your road trip will cost in fuel. Enter your trip distance in miles, your vehicle's fuel economy (MPG), and the current gas price per gallon to instantly calculate your total fuel cost.
All calculations are performed instantly in your browser — no sign-up, no ads blocking your results, completely free to use.
Frequently Asked Questions
How do I calculate road trip gas cost?+
Divide your trip distance by your car's MPG to get gallons needed, then multiply by the gas price per gallon. Example: 300 miles ÷ 30 MPG × $3.50 = $35 in gas.
What is the average MPG for a car in the US?+
The average fuel economy for new cars sold in the US is around 25–28 MPG. SUVs and trucks average 18–22 MPG, while hybrids can achieve 40–50 MPG.
How much does a 500-mile road trip cost in gas?+
500 miles ÷ 30 MPG = 16.7 gallons × $3.50/gallon = approximately $58.33 in gas. Use our calculator for any distance and vehicle.
How much gas does it take to drive across the US?+
Driving coast to coast (~2,800 miles) in a car getting 30 MPG at $3.50/gallon = approximately $327 in fuel costs.
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