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EV Charger Directory

AC EV charging time calculator

Estimate a constant-power AC session while making the vehicle limit, site limit and charging-loss assumption explicit.

This estimator uses the lowest of EVSE, vehicle and site power. It does not model a DC rapid-charging curve.

Scenario country

Changing language does not change the selected country, currency, source or assumptions. Any narrower tariff-source scope is stated beside the example.

60 kWh
20 kWh120 kWh
20 %
0 %90 %
80 %
10 %100 %

EVSE rated AC power

Vehicle AC input limit

Available site power

85 %
50 %100 %

85% is a visible, editable example; replace it with measured efficiency when available.

Constant-power AC estimate

6 h 3 min
Estimated charging time
rounded only after the calculation
42.35 kWh
Energy drawn from the grid
battery energy divided by efficiency
36 kWh
Energy stored in the battery
usable capacity × change in charge
7 kW
Effective power used
the selected power limits are equal

⚠ Actual results vary with temperature, auxiliaries, battery management and changing power. Use a manufacturer curve or measured average power for DC charging.

Formula, example and limits

The tool calculates battery energy from usable capacity and the change in state of charge, converts it to grid energy with the selected efficiency, then divides by the lowest selected power limit.

Ebattery = Cusable × ΔSOC · Egrid = Ebattery ÷ η · t = Egrid ÷ min(PEVSE, Pvehicle, Psite)

Reproducible example: 60 kWh usable, 20% to 80%, 85% efficiency and 7 kW at every limit gives 36 kWh stored, 42.35 kWh from the grid and about 6.05 hours.

  • The 2.3–22 kW options are AC scenario inputs, not typical national values or guarantees of available power.
  • The 85% starting point is a demonstration input. Real efficiency varies; change this input or use measured grid energy.
  • Peak DC power is excluded: it changes with state of charge, temperature and the vehicle's charging curve.

Methodology reviewed: 14 Oct 2026

Primary sources: JRC study: charging efficiency varies · US Department of Energy charging explanation

Turn energy into a cost scenario

Enter grid energy or battery levels, your own tariff and any incremental fee for one auditable charging session.

Estimate charging cost →