Fuel Cost Calculator (miles & mpg)

Fuel cost = miles ÷ mpg × price per gallon. 300 miles at 30 mpg and $3.50/gal ≈ $35.

Trip distance (miles)

Estimated cost

$35 fuel · 10 gal

Fuel economy (mpg)

Price per gallon ($)

Formula: miles ÷ mpg × price. Results update as you type.

Using kilometers or liters?

Convert first: km to miles for the distance and L/100km to mpg for consumption. Price per liter × 3.785 = price per US gallon.

Double the distance for a round trip. Real-world consumption is often 10–15% higher than the rated mpg at highway speeds above 70 mph.

How do I calculate fuel cost for a trip?

Divide the distance by your mpg to get gallons, then multiply by the price per gallon.