MPG Calculator
Calculate measured fuel efficiency from distance and fuel used.
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What this tool does
Calculate measured fuel efficiency from distance and fuel used. US gallons, not imperial gallons; fill-to-fill measurements reduce gauge error.
How to use the MPG Calculator
- Enter or select distance driven (miles).
- Enter or select fuel used in gal.
- Read the calculated result; change any measurement to compare alternatives.
Formula
MPG=distance miles/US gallons; L/100km=235.214583/MPG
- distance
- Distance driven (miles)
- gallons
- Fuel used (gal, before metric conversion)
US gallons, not imperial gallons; fill-to-fill measurements reduce gauge error.
Worked example
For mpg calculator, the following measurements illustrate the exact method: Distance driven (miles): 300; Fuel used: 10.
Inputs
- Distance driven (miles)300
- Fuel used10 gal
Result
- MPG (US)30
- L/100 km7.84
Results explained
- MPG (US)
- MPG (US) from the formula above. US gallons, not imperial gallons; fill-to-fill measurements reduce gauge error.
- L/100 km
- L/100 km from the formula above. US gallons, not imperial gallons; fill-to-fill measurements reduce gauge error.
Frequently asked questions
MPG=distance miles/US gallons; L/100km=235.214583/MPG
Use the tire sidewall markings, actual vehicle specifications or recorded fuel/price values required by the inputs. Do not mix US gallons and imperial gallons.
US gallons, not imperial gallons; fill-to-fill measurements reduce gauge error.
Yes. Change the relevant size, price or efficiency while keeping the other inputs constant. Results update immediately.
No. Check manufacturer fitment, load and speed ratings, clearance and local requirements with a qualified technician.