Fuel Cost Calculator (MPG)
Estimate the fuel cost of a trip from miles, MPG and the price per gallon.
Trip fuel cost
Fuel needed (gallons)
Cost per mile
The formula
Fuel needed = miles / MPG. Cost = fuel needed x price per gallon. Use US gallons with US prices; UK gallons are larger.
Example: 300 miles at 30 MPG uses 10 gallons, which costs 35 at 3.50 a gallon, or about 0.12 a mile.
Frequently asked questions
Is MPG the same in the UK?
No. A UK gallon is about 20% bigger than a US gallon, so UK MPG figures are higher.
Does driving style matter?
Yes. Speed, load and tyre pressure all change real MPG.
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Last updated October 2026. For information only, not financial advice.