How this ev charging time calculator works
Required battery energy is capacity × the state-of-charge change. That energy is divided by charger power and charging efficiency to estimate hours.
How to use it
- Battery capacity. Enter the value in kWh.
- Starting charge. Enter the value in %.
- Target charge. Enter the value in %.
- Charger power. Enter the value in kW.
- Charging efficiency. Enter the value in %.
- Request the result. Add your email, then select “Email & show my result.”
What to do with the number
DC fast charging typically tapers at high state of charge, so a constant-power estimate can be optimistic above roughly 80%. For home Level 2 charging, the vehicle’s onboard charger can cap power below the EVSE rating; use the lower effective power.
Planning estimate
Use this result as a starting point, not a guarantee. Product specifications, site conditions, manufacturer guidance, local codes, taxes, labor, tolerances, and rounding can change the real requirement or cost.