EV Charging Time Calculator

Calculate how long it will take to charge your electric vehicle based on battery capacity, charger power, and current state of charge.

Formula

Energy Needed (kWh) = Battery Capacity × (Target SOC − Current SOC) / 100

Effective Charge Power (kW) = Charger Power × (Efficiency / 100)

Charging Time (hours) = Energy Needed ÷ Effective Charge Power

Grid Energy Drawn (kWh) = Energy Needed ÷ (Efficiency / 100)

Assumptions & References

  • Charging efficiency (default 90%) accounts for heat losses in the onboard charger and cable; real-world values typically range from 85–95% for AC charging and 92–97% for DC fast charging (U.S. DOE).
  • Charger power levels: Level 1 ≤ 1.9 kW (120V/16A), Level 2 up to 19.2 kW (240V/80A), DC Fast Charger 20–350 kW (AFDC).
  • Formula reference: Charging Time = (kWh needed) / (charger kW × efficiency) — standard EV charging calculation used by SAE J1772 and IEC 61851 standards.

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References

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