Tempo carregamento
- Created by
- Renato Passos, Eng. de Software
- Reviewed by
- Renato Passos, Eng. de Software
Last updated: Apr 18, 2026
Formula
kWh / kW
About this calculator
The EV charging time calculator estimates how long it will take to recharge a battery based on its capacity (in kWh) and the charger's power (in kW). The formula used is: time = kWh / kW. For example, a 70kWh battery connected to a 7kW charger will take about 10 hours to charge fully.
Home chargers (~7kW) are slower, while high-power stations (~150kW) reduce charging time significantly. Actual speed may vary depending on battery condition, charger capacity, and vehicle efficiency. Always refer to the manufacturer's manual to understand charging system limitations.
Most EVs slow down charging as the battery approaches 100% to protect it. Extreme temperatures and battery age can also affect performance. Check charger compatibility with your vehicle model before using this tool for accurate results.
Frequently asked questions
How does the charging time formula work?
The formula divides battery capacity (kWh) by charger power (kW). For example, 70kWh / 7kW = 10 hours. This assumes constant charging without interruptions.
Why might the actual time differ from the calculation?
Factors like temperature, battery condition, and vehicle charging system limitations affect real-world results. The formula is a theoretical estimate.
Does the calculator account for efficiency losses?
No, the formula excludes losses from heat or charging inefficiency. Real time may be 10-20% longer.
Can I use it for different charger power levels?
Yes, just input the correct power value. 3kW, 7kW, 150kW, or even 350kW chargers work with this formula.