Home Charging Cost Calculator (Indiana Electricity Rates)

Estimate your monthly and annual home EV charging costs based on Indiana's average residential electricity rates.

Battery Capacity (kWh) Check your EV's spec sheet for usable battery capacity (e.g., Tesla Model 3 LR ≈ 75 kWh)

Charges per Month Typical drivers charge 6–12 times per month depending on range and driving habits

Average State of Charge Before Charging (%) Most drivers plug in around 20–30% remaining charge

Target Charge Level (%) Charging to 80–90% is recommended for daily use to preserve battery health

Charger Efficiency (%) Level 2 chargers are typically 85–92% efficient; Level 1 chargers ~80–85%

Electricity Rate (¢/kWh) Indiana average residential rate ≈ 13.72 ¢/kWh (EIA, 2024). Check your utility bill for your exact rate.

1. Energy added per session (battery):
E_battery = Battery Capacity (kWh) × (Target% − Start%) / 100

2. Wall energy consumed per session:
E_wall = E_battery / (Charger Efficiency / 100)
Accounts for heat and conversion losses in the charger.

3. Monthly wall energy:
E_monthly = E_wall × Charges per Month

4. Monthly cost:
Cost_monthly = E_monthly × (Rate ¢/kWh / 100)

5. Annual cost:
Cost_annual = Cost_monthly × 12

6. Cost per mile:
Cost/mile = Cost_session / (E_battery × 3.5 miles/kWh)

Indiana average residential electricity rate: 13.72 ¢/kWh (U.S. Energy Information Administration, Electric Power Monthly, 2024 — eia.gov).
Charger efficiency: Level 2 (240V) chargers typically operate at 85–92% efficiency; Level 1 (120V) at 80–85%. Losses occur as heat during AC→DC conversion (SAE J1772 standard).
Battery capacity: Use the usable capacity from your EV's specifications, not the gross capacity. Common examples: Tesla Model 3 LR ≈ 75 kWh, Chevy Bolt EV ≈ 65 kWh, Nissan Leaf (40 kWh) ≈ 36 kWh usable.
Charging to 100%: Most EV manufacturers recommend daily charging to 80–90% to preserve long-term battery health (Tesla, GM, Nissan owner manuals).
Cost per mile estimate: Uses EPA average EV efficiency of 3.5 miles/kWh (≈ 28 kWh/100 miles). Actual efficiency varies by vehicle, speed, temperature, and driving style.
Time-of-use (TOU) rates: Some Indiana utilities (e.g., Duke Energy Indiana, AES Indiana) offer TOU plans with off-peak rates as low as 7–9 ¢/kWh overnight. Check with your utility for available EV charging rate plans.
Utility references: Duke Energy Indiana (duke-energy.com), AES Indiana (aesindiana.com), Indiana Michigan Power (indianamichiganpower.com).
This calculator does not account for demand charges, fixed monthly fees, or federal/state EV tax credits.

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