Gas Mileage Calculator
Calculate your car's MPG and cost per mile.
Gas Mileage Calculator
$
Live result
MPG
29.17
Cost per mile
$0.12
Cost per 100 miles
$12.00
What it is
Calculate real-world MPG from a tank of gas. The number on the window sticker is best-case — your actual mileage depends on traffic, terrain, and driving style.
The formula
MPG = miles driven ÷ gallons used Cost/mile = price per gallon ÷ MPG
Why it matters
Understanding gas mileage calculator helps you make a better-informed decision before you commit money or time.
Worked examples
Try the example
Use the defaults above as a starting point — then adjust the inputs to match your situation.
Common pitfalls
- Double-check the units on every input — most errors come from mixing units.
- Round at the end, not in the middle of the formula.
Frequently asked questions
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