Fuel Cost Per Mile Calculator
Units
Round trip?
Real-world figures run 10–20% worse than the label in winter and at highway speed
Trip fuel cost
$36.43
10.7 gal for 300 mi · $0.121 per mi
Over 12,000 mi a year
Fuel a year: $1,457 ($121 a month)
Calculate the fuel cost of a trip and the cost per mile or kilometer from fuel economy and fuel price, split it between passengers, project a year of driving, and compare two cars' fuel economy, in US or metric units.
Formula
Worked Example
300 ÷ 28 = 10.71 gallons, which at $3.40 costs $36.43, or $3.40 ÷ 28 = 12.1 cents a mile. At 12,000 miles a year that is $1,457 of fuel, about $121 a month.
Frequently Asked Questions
How do I convert mpg to L/100 km?
Divide 235.2 by the mpg (US gallons): 28 mpg is 8.4 L/100 km and 40 mpg is 5.9. Lower L/100 km is better, the opposite of mpg.
Why is my real fuel economy lower than the EPA rating?
Cold weather, short trips, high highway speeds, roof racks, under-inflated tires and aggressive driving all cost fuel. Real-world economy commonly runs 10–20% below the label in winter and at speeds above 70 mph.
What does a car really cost per mile?
Fuel is usually the smaller part. Including depreciation, insurance, maintenance, repairs and financing, AAA's annual estimates have put the average total cost of owning a new car at around 80 cents per mile in recent years.