EV Charge Time Calculator
Estimate how long it takes to charge an electric vehicle at home or on a fast charger from battery size and charger power, free in your browser.
Enter Values
Minimum 0
Minimum 0
Range 0–100
Range 0–100
How to use this calculator
- Enter the battery size (kWh) and charger power (kW).
- Set the start and target charge percentages.
How it works
Energy needed = battery × (target − start)%. Time = that energy ÷ charger power, allowing ~90% charging efficiency.
Worked example
60 kWh, 7 kW, 20→80%. About 5.7 hours.
Common mistakes
- Expecting the same speed above 80% — charging deliberately slows to protect the battery.
- Using the car's max rate when your charger or supply is the real limit.
Frequently asked questions
How is EV charging time calculated?
Time ≈ energy needed (kWh) ÷ charger power (kW), plus some overhead. Adding 40 kWh on a 7 kW charger takes roughly 6 hours.
Why does fast charging slow down near full?
Batteries taper the rate above about 80% to protect the cells, so the last 20% takes disproportionately longer — handy to know on road trips.
Why doesn't it match the '10-80% in 18 min' claim?
Those are DC fast-charger figures. This tool models a steady rate; real DC charging tapers, and AC home charging is much slower.
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Cite this tool
Zerdly. (2026). EV Charge Time Calculator. Retrieved from https://www.zerdly.com/tools/ev-charge-time-calculator/
Tip: Enter any known values to calculate the remaining results.
All calculations run in your browser. Your inputs are never saved or transmitted.