EV Charging Time Calculator

Battery animation
Enter the usable EV battery capacity in kWh.
Enter the charger power output.
Default is 90% if left empty.

EV charging time depends on the usable battery capacity in kilowatt-hours, the charger output power in kilowatts, and the charging efficiency. This simple calculator shows how many hours it takes to charge your electric vehicle from empty to full based on rated charger power.

How EV charging time is calculated

Formula:
Time (hours) = Battery (kWh) ÷ Charger power (kW) × (1 / Efficiency)

AC vs DC charging

AC chargers (home/level-2) normally take longer, while DC fast chargers deliver much higher power and therefore reduce total charging time significantly.

Charging efficiency

EV chargers are not 100% efficient. Most home chargers operate between 85-95% depending on charging hardware and onboard electronics.

Frequently Asked Questions

Q: Does a bigger charger reduce time?
Yes. Higher kW charger fills the same battery faster.
Q: Is fast charging bad for battery?
Fast DC charging produces more heat and may increase long-term battery wear compared to slow AC charging.
Q: Does the car limit charging speed?
Yes, EVs have onboard limits. Charger power cannot exceed what the car accepts.
Q: Is efficiency included automatically?
You can enter a custom percentage. If left blank, 90% is used.
Q: Can I calculate partial charging?
Multiply the result by the percentage you need (e.g., 20-80%).