MPGe Calculator

Enter Calculation

Distance Driven (miles)

Electricity Used (kWh)

Results

Fuel Economy

112.33

MPGe (miles per gallon equivalent)

Gasoline-gallon equivalent used	0.89 GGE
Miles per kWh	3.33 mi/kWh
Energy use per 100 miles	30 kWh/100mi

What Is MPGe?

MPGe (miles per gallon equivalent) is a fuel-economy metric introduced by the US Environmental Protection Agency so that electric and hybrid vehicles can be compared with traditional gasoline cars. Because EVs run on electricity measured in kilowatt-hours rather than gallons of fuel, the EPA established a conversion: one US gallon of gasoline holds the same energy as 33.7 kWh of electricity. MPGe tells you how many miles a vehicle travels on that energy equivalent of one gallon.

The EPA standard treats 33.7 kWh of electricity as energy-equivalent to one gallon of gasoline.

How to Use This Calculator

Enter the distance you drove in miles and the amount of electricity you consumed in kilowatt-hours (kWh) over that distance. You can read kWh from your charger, your vehicle's trip computer, or your home energy monitor. The calculator returns your MPGe along with the gasoline-gallon equivalent used, your miles per kWh, and your energy use per 100 miles.

The Formula Explained

First convert the electricity used into a gasoline-gallon equivalent: \(\text{GGE} = \text{kWh} \div 33.7\). Then divide your miles driven by that figure: \(\text{MPGe} = \text{miles} \div \text{GGE}\). Combined,

$$\text{MPGe} = \frac{\text{Distance (miles)}}{\dfrac{\text{Electricity (kWh)}}{33.7}}$$

A higher MPGe means the vehicle uses energy more efficiently.

MPGe converts electricity used into gallon-equivalents, then divides miles by that amount.

Worked Example

Suppose you drove 100 miles and used 30 kWh of electricity. The gasoline-gallon equivalent is \(30 \div 33.7 = 0.8902\) GGE. Your MPGe is

$$\text{MPGe} = \frac{100}{\dfrac{30}{33.7}} = \frac{100}{0.8902} = 112.3$$

That also equals 3.33 miles per kWh and 30 kWh per 100 miles.

FAQ

Why 33.7 kWh per gallon? This is the EPA's official equivalence based on the energy content of gasoline, allowing direct comparison between fuel types.

Is higher MPGe better? Yes. Like MPG, a higher MPGe means more miles for the same amount of energy, so the vehicle is more efficient.

Does MPGe account for charging losses? If you measure kWh drawn from the wall (including charging losses), your real-world MPGe will be lower than the battery-only figure. Use the kWh value that best reflects what you actually paid for.