EV Home Charging Cost Calculator
Estimate your monthly and annual home EV charging costs based on your vehicle's battery capacity, local electricity rate, and how much you drive.
Full usable battery size of your EV (e.g. Tesla Model 3 Long Range = 75 kWh)
Check your utility bill for your rate. US average is ~13–16 ¢/kWh.
Your typical daily driving distance.
Found in your vehicle specs or EPA rating (typical range: 2.5–4.5 mi/kWh).
Energy lost during charging. Level 2 chargers are typically 85–95% efficient.
Formulas Used
1. Net kWh consumed per day (motor energy):
kWhbattery = Miles per Day ÷ Efficiency (mi/kWh)
2. Gross kWh drawn from grid per day (wall energy):
kWhgrid = kWhbattery ÷ (Charger Efficiency / 100)
3. Daily charging cost:
Costday ($) = kWhgrid × Electricity Rate (¢/kWh) ÷ 100
4. Monthly cost:
Costmonth = Costday × 30.44
5. Annual cost:
Costyear = Costday × 365.25
6. Full charge cost:
Costfull ($) = (Battery Capacity ÷ Charger Efficiency) × Rate ÷ 100
7. Cost per mile:
Costmile = Costday ÷ Miles per Day
Assumptions & References
- Monthly cost uses 30.44 days/month (365.25 ÷ 12); annual cost uses 365.25 days/year to account for leap years.
- Charger efficiency accounts for heat loss during AC→DC conversion. Level 1 (120V) chargers: ~80–85%; Level 2 (240V) chargers: ~88–95%.
- EV efficiency (mi/kWh) varies by vehicle, speed, temperature, and terrain. EPA ratings are measured under controlled conditions.
- US average residential electricity rate: ~13–16 ¢/kWh (EIA, 2024). Rates vary significantly by state and time-of-use tariff.
- This calculator assumes the vehicle is charged exclusively at home. Public charging costs are not included.
- Battery degradation over time is not modeled; efficiency may decrease slightly as the battery ages.
- References: U.S. Energy Information Administration (EIA) — Electric Power Monthly; U.S. EPA — fueleconomy.gov; DOE — Alternative Fuels Data Center.