EV Level 1 & Level 2 Charger Cost Calculator
Enter your battery size, target state of charge and local electricity rate to see what a home charge really costs — including the charging losses that make Level 1 (120V) slightly more expensive per session than Level 2 (240V).
Your charging inputs
How EV home charging cost is calculated
The formula is simple: kWh added = battery capacity × (target % − start %), then cost = kWh ÷ charging efficiency × your rate. Level 1 charging typically lands around 85% end-to-end efficiency because the onboard charger and battery management run for far longer, while Level 2 charging is closer to 92%. Both draw the same electricity price per kWh, so Level 2 is cheaper mainly because it wastes less energy and finishes inside cheap overnight off-peak windows.
For a deeper breakdown with regional price tables, read our EV home charging cost guide, or estimate the rest of your household with the home electricity bill estimator.