Electric Car Efficiency Converter

Convert between different electric car efficiency metrics such as kWh/100mi, mi/kWh, kWh/100km, km/kWh, Wh/mi, and Wh/km.

Reviewed August 29, 2026 · Calculation methodology · Inputs stay in your browser

Efficiency Value Enter the efficiency value you want to convert.

From Unit Select the current unit of your efficiency value.

Electric Car Efficiency Tips

Lower values of kWh/100mi or Wh/mi indicate better efficiency (less energy used).
Higher values of mi/kWh or km/kWh indicate better efficiency (more distance per unit of energy).
Most modern EVs have efficiency ratings between 25-40 kWh/100mi (250-400 Wh/mi).
EPA ratings for electric cars typically use kWh/100mi in the US, while mi/kWh is easier for consumers to understand.
European EV efficiency is often reported in Wh/km or kWh/100km.
Electric car efficiency varies significantly with driving conditions, speed, climate control use, and temperature.