MPGe Efficiency
Convert an EV's watt-hours per mile into MPGe and miles per kWh.
About MPGe Efficiency
MPGe expresses how far an EV would travel on the energy content of one gallon of gasoline, which is 33.7 kWh. MPGe and miles per kWh let you compare an EV against a gas car and against other EVs regardless of drivetrain.
Formula
MPGe Efficiency
MPGe = 33.7 kWh / (Wh per mile / 1000)
- 33.7 kWh
- Energy in one gallon of gasoline equivalent
Worked example
With the default values below, MPGe Efficiency returns MPGe of 112.3. Change any input above and every figure here is recalculated in your browser.
Inputs used
- Energy useminimum 0.1 Wh/mi
- 300 Wh/mi
Results
- MPGe
- 112.3
- Miles per kWh
- 3.33
- kWh per 100 Miles
- 30.00
Step by step
- 1Values used
- 2MPGe Efficiency
- 3MPGe= 112.3
- 4Miles per kWh= 3.33
- 5kWh per 100 Miles= 30.00
Assumptions and limits
- The result is derived only from the single input listed above. Anything not among them is not part of the calculation.
- In particular, this calculator does not take inflation, tax, fees or charges or compounding frequency into account.
- Figures are rounded for display to 2 decimal places, so totals built from several rounded parts can differ slightly from the unrounded arithmetic.
How these calculators are built and tested is described on the Methodology page. If a figure looks wrong, please report it.
Frequently Asked Questions
How is MPGe Efficiency calculated?
MPGe = 33.7 kWh / (Wh per mile / 1000) MPGe expresses how far an EV would travel on the energy content of one gallon of gasoline, which is 33.7 kWh.
Why does MPGe Efficiency matter?
MPGe and miles per kWh let you compare an EV against a gas car and against other EVs regardless of drivetrain.
What values do I need to enter?
This calculator takes 1 input: Energy use. The pre-filled defaults are a realistic starting point — replace them with figures from your own environment for a result you can act on.