Automotive
Fuel mileage calculator
Calculate miles per gallon from two odometer readings and the gallons used, then see your fuel cost and cost per mile. Sign in to save the latest five fill-ups and reuse your last odometer reading. For accurate tank-to-tank MPG, mark partial fills and let the next full tank close the interval.
Fuel mileage report
Odometer readings and pump cost used for this calculation.
Distance is the ending reading minus the starting reading. MPG is distance divided by gallons used. For the most reliable per-tank result, use a consistent full-to-full method and include partial-fill gallons in the interval.
CALCFORGED / AUTOMOTIVE
Fuel mileage, without the guesswork.
Calculate one interval, or keep a small, useful log of what the last five stops cost.
YOUR RESULT
Interval summary
Enter a starting reading, ending reading, and gallons used to see your fuel economy.
PLAN A DRIVE
Estimate a trip’s fuel cost
Uses your saved average MPG, or the manual MPG result if you have not logged a full-tank interval yet.
NEARBY STATIONS
Find a gas station near you
Open a Google Maps search for nearby stations. CalcForged does not ask for or store your location.
The math, plainly
How it works
- 01
Distance is the ending odometer reading minus the starting reading.
- 02
Fuel economy is distance divided by gallons used. For a reliable per-tank result, compare full tanks and include every partial fill between them.
- 03
When you log a partial fill, its gallons carry forward. The log calculates MPG when you record the next full tank, then shows the last five fill-up costs.
Try a real scenario
350 miles between fill-ups
InputsStarting odometer 42,180 mi, ending odometer 42,530 mi, 12.5 gallons, $45 paid
Result350 miles, 28.0 MPG, $3.60 per gallon, and about $0.13 per mile.
More from Amazon
More options for this calculator
Fuel mileage logbook (paid link)
Record fill-ups and odometer readings alongside your fuel-economy estimate.
OBD2 scanner (paid link)
Read vehicle diagnostic data alongside your mileage notes.
Digital tire pressure gauge (paid link)
Check tire pressure and keep the reading with vehicle records.
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