EV Charging Cost Calculator
Calculate what an EV charging session costs from battery size, charge range, and electricity price — with charger losses and cost per 100 mi/km.
Processed locally in your browser — nothing is uploaded.
AC charging typically loses ~10% between the wall and the battery.
Enter battery size, charge range, and electricity price.
About EV Charging Cost Calculator
Enter your battery capacity, the charge window (say 20% to 80%), and your electricity rate. The calculator accounts for charger efficiency — the ~10% that's lost between the wall and the battery — so the cost reflects what your meter actually records. Add your car's efficiency (mi/kWh or kWh/100km) to get a cost per 100 miles or kilometers you can compare directly against a gas car.
Common uses
- See what a nightly home top-up really costs
- Compare cost per 100 miles against a gas car's fuel cost
- Check whether a public charger's per-kWh price is worth it
Example
Input
75 kWh battery · 20→80% · $0.15/kWh · 90% efficiency
Output
45 kWh added · 50 kWh drawn · $7.50
Limitations
- Charger efficiency varies by charger and temperature; DC fast charging and idle fees are not modeled.