Enter the battery capacity (kW-h) and the charging power (kW) into the Calculator. The calculator will evaluate the EV Charge Time. 

EV Charge Time Formula



  • EVCT is the EV Charge Time (hours)
  • BC is the battery capacity (kW-h)
  • CP is the charging power (kW)

To calculate EV Charge Time, divide battery capacity by the charging power.

How to Calculate EV Charge Time?

The following steps outline how to calculate the EV Charge Time.

  1. First, determine the battery capacity (kW-h). 
  2. Next, determine the charging power (kW). 
  3. Next, gather the formula from above = EVCT = BC / CP.
  4. Finally, calculate the EV Charge Time.
  5. After inserting the variables and calculating the result, check your answer with the calculator above.

Example Problem : 

Use the following variables as an example problem to test your knowledge.

battery capacity (kW-h) = 50

charging power (kW) = 100

Frequently Asked Questions (FAQ)

What factors can affect EV charge time besides battery capacity and charging power?

Several factors can influence EV charge time, including the ambient temperature, the state of the battery (new vs. aged), the charging station’s capabilities, and whether the charging process is being managed to optimize battery health.

How does the energy density of a battery relate to its capacity?

Battery energy density refers to the amount of energy a battery can store relative to its weight or volume. A higher energy density means a battery can store more energy for a given size, directly impacting its capacity to hold charge and, consequently, the potential EV charge time.

Is it possible to calculate EV charge time for partial charges?

Yes, to calculate the time for a partial charge, you would adjust the battery capacity (kW-h) value to reflect the portion of the battery you intend to charge. For example, for a half charge, you would use half the battery’s total capacity in the calculation.

Can different charging stations affect the EV charge time?

Yes, different charging stations can significantly affect the EV charge time. Stations with higher kW (kilowatt) ratings can deliver more power, potentially reducing charge time. However, the vehicle’s maximum charging rate and compatibility with the charging station also play crucial roles.