Home Charging Cost Calculator
Estimate how much it costs to charge your electric vehicle at home, including per-session, monthly, and annual costs.
Total usable battery capacity of your EV (check your owner's manual)
How charged is your battery right now?
Most manufacturers recommend charging to 80% for daily use
Check your utility bill for your local rate (US average ~16¢/kWh)
Level 1/2 chargers typically 85–95% efficient due to heat loss
How many times per month do you charge at home?
Formulas Used
Energy Needed (kWh) = Battery Capacity × (Target SoC% − Current SoC%) ÷ 100
Energy from Wall (kWh) = Energy Needed ÷ (Charger Efficiency ÷ 100)
Cost per Session ($) = Energy from Wall × (Electricity Rate ÷ 100)
Monthly Cost ($) = Cost per Session × Sessions per Month
Annual Cost ($) = Monthly Cost × 12
Effective Cost per kWh Delivered ($) = (Electricity Rate ÷ 100) ÷ (Charger Efficiency ÷ 100)
Assumptions & References
- Charger efficiency accounts for AC-to-DC conversion losses and heat dissipation; Level 2 (240V) chargers typically operate at 85–95% efficiency (U.S. DOE).
- The U.S. average residential electricity rate is approximately 16¢/kWh as of 2024 (U.S. EIA).
- Battery manufacturers recommend charging to 80% for daily use to preserve long-term battery health; 100% is recommended only before long trips.
- This calculator does not account for time-of-use (TOU) rate variations; charging overnight during off-peak hours can significantly reduce costs.
- Calculation assumes a full charge cycle from current SoC to target SoC with no interruptions.
- Does not include any utility demand charges, taxes, or EV charger hardware/installation costs.