Gas Mileage Calculator
Calculate MPG from miles driven and gallons used.
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How It Works
Calculates fuel economy (MPG or L/100km) from miles driven and gallons used. Better fuel economy means lower fuel costs and fewer emissions per mile traveled.
Formula
MPG = Miles / GallonsQuick Reference
Common calculations — results you can verify instantly.
300 miles, 10 gallons
300/10
30 MPG
500 miles, 15 gallons
500/15
33.3 MPG
Good MPG benchmark
EPA standard
>30 MPG is efficient
Tips & Shortcuts
Track fuel economy over multiple fill-ups for the most accurate average.
Tire pressure at correct PSI improves fuel economy by 0.5-3%.
Highway driving is typically 20-30% more fuel efficient than city driving.
Common Mistakes
Calculating MPG from a partial tank fill
Fill tank completely both times. Record miles at each fillup. MPG = miles ÷ gallons used.
Not comparing to EPA rating to catch maintenance issues
Significantly lower than EPA MPG signals a tuneup need: dirty air filter, low tire pressure, or engine issues.
Frequently Asked Questions
Cars: 30+ MPG is good. Trucks/SUVs: 20+ MPG is good. Hybrids: 45-55 MPG. EVs are measured in MPGe.
At $3.50/gallon, going from 25 to 26 MPG saves ~$54/year for 10,000 miles driven.
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