Charging Cost Calculator
Estimate how much it costs to charge your electric vehicle from your current battery level to your target level.
Formula
Energy Added to Battery (kWh) = Battery Capacity × (Target% − Current%) / 100
Energy Drawn from Grid (kWh) = Energy Added ÷ (Charger Efficiency / 100)
Total Charging Cost ($) = Energy Drawn from Grid × Electricity Rate ($/kWh)
Assumptions & References
- Battery capacity refers to the usable capacity of the EV battery pack in kilowatt-hours (kWh).
- Charger efficiency accounts for energy lost as heat during AC-to-DC conversion (Level 1/2 chargers) or DC fast charging. Typical values range from 85%–95%.
- Electricity rate is the cost per kWh billed by your utility provider. The U.S. average residential rate is approximately $0.13/kWh (EIA, 2024).
- This calculator does not account for time-of-use (TOU) pricing, demand charges, or network/session fees that some public chargers apply.
- Battery degradation and temperature effects on charging efficiency are not modeled.
- Reference: U.S. Energy Information Administration (EIA) — Electric Power Monthly, 2024.