EV Charging Time Calculator
Estimate how long an EV charge takes from the kWh you need to add, your charger's power level, and real-world charging efficiency.
time = 40 kWh ÷ 6.48 kW = 6.17 h ≈ 6h 10m
Charging time comes down to how much energy you need divided by how fast it goes in. The energy is in kilowatt-hours: you can enter it directly, or let the tool work it out from your battery's size and the state-of-charge gap you want to close — going from `20%` to `80%` of a `60 kWh` pack is `36 kWh`. The speed is your charger's power in kilowatts, reduced by a charging efficiency that accounts for AC-to-DC conversion and thermal losses.
Charger power is what sets the pace. A Level 1 cord on a standard outlet delivers around `1.4 kW`, a Level 2 home unit about `7.2 kW`, and a Level 3 DC fast charger `50 kW` or more. Dividing the kWh you need by the effective power — charger kW times efficiency — gives the hours, which the tool shows as hours and minutes.
Real charging is not perfectly linear, especially on DC fast charging, where the rate tapers off sharply above `80%` to protect the battery. That is why most fast-charging stops target `80%`. For overnight Level 2 charging at home the estimate is close, because the car holds near its full AC rate across most of the session.
effective power = `7.2 kW` × `0.90` = `6.48 kW`
time = `40 kWh` ÷ `6.48 kW` = `6.17 h` ≈ `6 h 10 m`