Cost & Savings

MPG Cost Calculator

The MPG cost calculator turns your fuel economy into real dollars. As a cost of miles per gallon calculator, it takes the miles you drive, your vehicle's MPG, and the local gas price, then shows exactly what that driving costs in fuel. Fuel is usually the biggest variable expense of owning a car, so seeing it as a clear total makes budgeting far easier.

Working as a miles per gallon fuel cost calculator, the tool returns your total fuel cost, cost per mile, cost per 100 miles, and the gallons used. The cost-per-mile figure is especially useful as a miles per gallon price calculator — it lets you compare vehicles or routes on an even footing no matter how far each trip runs. Whether you treat it as a miles per gallon money calculator for everyday budgeting or a miles per gallon cost calculator for planning a road trip, the math is identical and instant.

If you're calculating costs for reimbursement purposes, the IRS standard mileage rate covers all vehicle costs — but knowing your actual cost per mile helps you compare. Used as a miles per gallon reimbursement calculator, this tool isolates the pure fuel component so you can see how much of any reimbursement is fuel versus wear and depreciation. For comparing two cars over a year, try our Fuel Savings calculator; for a full trip breakdown, see Trip Cost.

How to Use

  1. Enter the miles driven.
  2. Enter your vehicle's MPG.
  3. Enter the current gas price per gallon.
  4. Click Calculate Fuel Cost (or press Enter).
  5. Review total cost, cost per mile, cost per 100 miles, and gallons used.

Got Questions?

MPG Cost Calculator FAQ

Multiply gallons used (miles ÷ MPG) by the gas price. For example, 300 miles at 30 MPG uses 10 gallons; at $3.50/gal that is $35 in fuel.

At 30 MPG and $3.50/gal, cost per mile is about $0.117. Higher MPG = lower cost per mile.

Use annual miles ÷ 12 for monthly miles, then apply the formula. Our Annual Cost tab on the homepage does this automatically.

The IRS standard mileage rate for 2024 is 67 cents per mile, which covers fuel, maintenance, and depreciation — not just fuel alone.

Improve your MPG through tire pressure, smooth driving, regular maintenance, and reducing excess weight. Each MPG gain reduces cost per mile.