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EV Efficiency Converter (Wh/km, kWh/100km, mi/kWh, MPGe)
Convert electric vehicle efficiency between Wh/km, kWh/100km, mi/kWh and MPGe. Estimate range and charging cost.
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About EV Efficiency Converter (Wh/km, kWh/100km, mi/kWh, MPGe)
Electric vehicle efficiency is reported in many ways. Europe and most manufacturers use Wh/km or kWh/100km (lower is better). The US EPA reports mi/kWh and MPGe, Miles Per Gallon equivalent, based on the energy content of a gallon of gasoline (33.7 kWh).
This tool converts between all four notations and estimates the range and charging cost from your battery capacity.
Frequently asked questions
What is MPGe?
Miles Per Gallon equivalent. The US EPA defines 1 US gallon of gasoline as containing 33.7 kWh of energy, so MPGe = mi/kWh × 33.7.
How do I compare an EV with a gasoline car?
Compare cost per 100 km. EVs are usually 2–4× cheaper to run because the energy is cheaper and the drivetrain is far more efficient.
Why does battery capacity matter?
Range = (battery capacity ÷ efficiency). A 75 kWh battery at 16 kWh/100km gives ~470 km of real-world range.
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