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EV Charging Calculator
Estimate grid energy, cost, and charging time from battery capacity, charge levels, and power.
- Charging time, hours
- 5.71
- Grid energy, kWh
- 40
- Cost
- 8
How the calculation works
Battery energy = capacity × charge change/100; grid energy = battery energy/efficiency; time = grid energy/average input power.
Inputs
- Usable battery capacity, kWh
- Starting charge, %
- Target charge, %
- Charging efficiency, %
- Average input power, kW
- Price per kWh
Calculation details
Enter average charging input power rather than the advertised peak. Power commonly falls at high charge levels.
Efficiency allows for losses. Idle fees, session fees, and battery preconditioning are not modeled separately.
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Updated: 2026-10-02