Fuel Cost Calculator

The calculator divides your trip miles by your MPG to get gallons needed, then multiplies by the price per gallon for total cost. It also shows cost per mile and cost per 100 miles, both derived from that same total, so all four outputs stay consistent.

Use your real-world average if you track fill-ups. Otherwise the EPA combined rating for your make, model, and year is a reasonable starting point, but expect actual mileage to run 10-25% lower, especially in city traffic or with a heavy load.

Divide 235.21 by your MPG to get L/100km. A car rated 30 MPG works out to about 7.84 L/100km. The scales move in opposite directions, so higher MPG means lower L/100km.

Keep tires at the correct pressure, hold a steady speed at or below 65 MPH, remove roof racks or cargo carriers when not in use, and fill up at stations along your route rather than near tourist stops where prices run higher. Each of these nudges your effective MPG up and your per-mile cost down.

This calculator covers fuel only. For a broader estimate, add tolls, parking, and vehicle wear. The IRS business mileage rate is 70 cents per mile in 2025, 72.5 cents for January through June 2026, and 76 cents for travel on or after July 1, 2026. Those tax rates are comparison points, not measurements of your car's actual cost.