How it works
Calculate miles per gallon, fuel cost, and cost per mile from distance and fuel used.
Enter miles driven and gallons used; optionally add a per-gallon price. The calculator reports mpg and the fuel cost and cost per mile.
Formula
MPG = miles ÷ gallons; fuel cost = gallons × price; cost per mile = price ÷ mpg.
miles- Distance (miles)
gallons- Fuel used (US gallons)
Examples
- 300 miles on 10 gallons at 3.00/galMiles 300 · gallons 10 · price 3.0030 mpg · 30.00 fuel cost · 0.10/mile
Frequently asked questions
How do I improve mpg?
This tool only measures it. Smooth driving, tire pressure, and maintenance are common factors, but follow your vehicle's guidance.
Is it US or imperial gallons?
US gallons. Imperial gallons differ (≈ 4.546 L).
How to read the result
Higher mpg means better fuel efficiency; cost per mile combines efficiency and price.
Limitations
A single average mpg; real efficiency varies with conditions.
Source: Miles-per-gallon and cost-per-mile definitions.