Estimate charging time by dividing the energy you need by the average power actually delivered. Battery size and a charger’s advertised peak power do not give an accurate time on their own.
Calculate energy first
For a usable 60 kWh battery charging from 20% to 80%, the energy added is 60 × (80 − 20) ÷ 100 = 36 kWh. Use usable capacity, not an unrelated gross battery figure. Enter the starting and target percentages in the calculator.
An AC charging example
At 7.4 kW from the supply and an illustrative 90% efficiency, estimated time is 36 ÷ (7.4 × 0.90) = 5.4 hours. At a constant 11 kW it would be 3.6 hours. The car, installation and charger must all support that power; the lowest applicable limit governs.
Why fast charging is different
DC charging power changes with state of charge, temperature and battery management. A 150 kW sign does not mean 150 kW for the whole session. Use an observed or manufacturer-supported average for the relevant charge window, and allow for tapering, queues and connecting. The calculator assumes constant average power.
Australian Government: charging an EV
Calculator
Calculation takes place in your browser. Amounts use the currency of your inputs; no live tariffs. Estimates depend on the assumptions entered.
