How do I calculate fuel cost for a trip?

Fuel cost = (Distance ÷ MPG) × price per gallon. A 300-mile trip in a car getting 30 MPG at $3.50/gallon costs 10 gallons × $3.50 = $35 in fuel.

Fuel Cost Calculator

Estimate fuel cost from distance, mpg, and fuel price assumptions.

This tool runs in your browser. None of your data is saved or sold.

Distance (miles)

Fuel efficiency (MPG)

Fuel price ($/gallon)

Number of trips per month (months)

About This Calculator

Vehicle fuel cost is a significant but often underestimated part of transportation expense. This calculator shows the cost of a single trip and multiplies by monthly trips to give you a realistic monthly fuel budget. The cost-per-mile figure is especially useful for reimbursement or comparing fuel costs across vehicles.

Estimates only — not financial, tax, legal, or investment advice. Verify important results with a qualified professional before making decisions.

gallons = miles ÷ MPG; trip cost = gallons × price; monthly cost = trip cost × trips per month