EV Charging Cost Calculator
Cost to charge an electric car from battery size, charge window, charging losses and electricity price.
Inputs
kWh
%
%
%
per kWh
kWh/100 km
Results
- Charging cost
- 10
- Energy from grid
- 40 kWh
- Energy into battery
- 36 kWh
- Range added
- 212 km
- Cost per km
- 0.0472
Formula
Stored = Battery × (target − start)
Grid kWh = Stored ÷ efficiency
Cost = Grid kWh × price
Assumptions & limits
- AC home charging ≈ 85–92% efficient; DC fast charging ≈ 90–95%.
- Fast-charge networks may add session or time fees.
Worked example
60 × 60% = 36 kWh ÷ 0.9 = 40 kWh × 0.25 = 10.00; range 36 ÷ 17 × 100 = 212 km.