EV Home Charging Cost Calculator

Charging an electric car at home is cheap and easy to estimate because you pay for exactly what goes in — kilowatt-hours at your electricity rate. A single session costs the kWh added times your price per kWh. To turn that into a cost you can compare with gasoline, the calculator uses your car's efficiency, rated by the EPA in kWh per `100` miles, and your price per kWh to get a cost per mile.

From there, monthly cost is just your driving distance times that cost per mile. Enter miles per month (or switch to kilometers with the unit toggle) and the tool shows both the monthly kWh your car pulls from the wall and what that adds to your electricity bill. Because energy per mile and the cost per mile are physical, per-distance figures, the results show the other-system equivalent — cost per mile alongside cost per kilometer.

Two real-world notes. Home charging loses a little energy as heat, so metered kWh at the wall runs slightly above what reaches the battery; using your charger's or utility's kWh reading captures that. And rates vary — a time-of-use plan that is cheap overnight, exactly when most people charge, can cut the cost meaningfully.