| Unit | Value |
|---|---|
| MPGe | |
| Wh / mi | |
| kWh / mi | |
| kWh / 100 mi | |
| mi / kWh | |
| Wh / km | |
| kWh / km | |
| kWh / 100 km | |
| km / kWh |
Think of kW (Kilowatts) as speed and kWh (Kilowatt-hours) as capacity. In EV terms, kW is how fast you are charging, while kWh is the total energy your battery holds.
Units like mi/kWh measure distance (higher is better), while Wh/mi measures energy consumption (lower is better). When you become more efficient, your mi/kWh goes up, but your Wh/mi goes down.
Yes. Wh/km measures how much energy is used to move the car. A lower number means the car is more efficient. For example, 150 Wh/km is more efficient than 250 Wh/km.
Many of these numbers represent the same data with a shifted decimal point. For example, kWh/mi is simply Wh/mi divided by 1,000. Units like Wh/mi and Wh/km are the most "precise" because they provide whole-number granularity for trip planning, whereas others are shifted to make them easier to read or compare to manufacturer ratings.
Wh/mi (or Wh/km) provides more precision for trip planning. It tells you exactly how much battery energy is consumed per unit of distance, which is more helpful for calculating real-world range than the EPA's MPGe rating.
Yes, significantly. Efficiency units like Wh/mi or Wh/km are not static. Driving at higher speeds increases air resistance, which raises your energy consumption (higher Wh/mi) and lowers your range.
To find your estimated range, divide your battery's usable capacity (in kWh) by your efficiency. For example, if you have a 75 kWh battery and your average efficiency is 0.30 kWh/mi, your estimated range is 250 miles.
Your car displays real-time efficiency based on your driving habits, weather, and terrain. This calculator provides the mathematical equivalents based on standard constants; your car shows what you are actually achieving.