EV Charging Cost Calculator
Cost per session: kWh delivered × $/kWh, accounting for charger efficiency.
Result
Cost
$8.33
55.56 kWh from outlet (10% loss).
- Delivered to battery50 kWh
- Drawn from outlet55.56 kWh
- Charging loss10%
- Cost per kWh$0.1500
- Total cost$8.33
Step-by-step
- Drawn = delivered / (1 − loss) = 50 / (1 − 0.1) = 55.56 kWh.
- Cost = 55.56 × $0.15 = $8.33.
How to use this calculator
- Enter kWh added to your battery (from car app).
- Enter your electricity rate.
- Default 10% loss is standard for Level 2 home charging.
About this calculator
When you charge an EV, you pay for energy drawn from the wall, but only some reaches the battery. Typical Level 2 home AC charging: 90% efficient (10% loss as heat). DC fast charging: 95-96% efficient (faster but more sophisticated). Use this for accurate per-session costs.
Frequently asked
Power conversion (AC → DC), heat in cables, battery thermal management. Even good chargers waste 5-15%.
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