How to Estimate EV Range from kWh
Last reviewed: 2026-06-14
Quick answer
Range can be estimated by combining available battery energy with an efficiency number such as miles per kWh or kWh per 100 km. This avoids relying on a vehicle database and lets you use your own driving efficiency.
Using miles per kWh
Multiply available kWh by miles per kWh to estimate miles. If you have 50 kWh available and your recent efficiency is 3.5 miles per kWh, the simple estimate is about 175 miles before weather, speed, and reserve needs.
Using kWh per 100 km
Divide available kWh by kWh per 100 km, then multiply by 100 to estimate kilometers. For example, 42 kWh available at 16.8 kWh per 100 km estimates to about 250 km.
Real-world differences
Speed, weather, terrain, tires, and climate control affect actual range. Use your recent dashboard efficiency when you can, and keep a reserve when planning a trip with few charging options.
FAQ
Why not use a vehicle database?
This version stays maintainable by letting users enter their own efficiency value. It also avoids stale vehicle assumptions, because real efficiency can vary widely by driver, season, route, and tire setup.