EV charging time calculator
Enter battery size, current and target charge and the charger power to get an approximate charging time at home or on the road.
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How to use it
- Enter usable battery capacity, current charge, target charge, charger power and charging efficiency.
- The result appears straight away and updates as you edit.
- Copy the result, or copy a link that keeps the same values to share it.
How it is calculated
Time (h) = capacity × (target % − current %) ÷ 100 ÷ (charger power × charging efficiency).
Example
Inputs: Usable battery capacity = 75 kWh, Current charge = 20 %, Target charge = 80 %, Charger power = 11 kW, Charging efficiency = 90 %. Result: Charging time: 4.55 h; Time in minutes: 273 min; Rounded time: 4 h 33 min.
Limits and caveats
- Fast charging slows sharply above about 80%, so real time to 100% is longer than shown.
- The car may cap the power: a 22 kW wallbox gives no gain if the onboard charger is limited to 11 kW.
Questions about this tool
What power does a home charger usually have?
A single-phase wallbox is about 7.4 kW, three-phase units are 11 or 22 kW, and a regular socket is under 3 kW.
Why does a fast charger not deliver its full rating?
The battery accepts peak power only within a certain charge and temperature window, then the car lowers the power.
Should I enter the charger's power or the car's?
Use whichever is lower, because that sets the real charging speed.