How is EV charging time calculated?
Energy added is battery capacity multiplied by the percentage-point increase. Time is that energy divided by the lower of EVSE output and the vehicle’s AC limit, with a 90% planning efficiency.
Free energy calculator
EV charging time calculator
Estimate Level 1 or Level 2 charging from the energy added and the lowest real power limit.
Use the result
What to do next
The number narrows the market; it does not select a product by itself. Compare continuous and surge limits, charging compatibility, certification for intended use, warranty and total installed cost.
Sources
- U.S. DOE Alternative Fuels Data Center: EV charging stationsCharging levels, typical power ranges and the factors that change charging time. Checked October 26, 2026.
- U.S. DOE Alternative Fuels Data Center: charging at homeHome charging choices and planning guidance. Checked October 26, 2026.
Quick answers
EV charging time calculator FAQ
Why can a larger charger give the same result?
The vehicle’s onboard AC charger or the configured circuit can be the lower power ceiling.
Is this the same as DC fast charging?
No. This calculator is for AC Level 1 and Level 2 planning, not a vehicle-specific DC fast-charging curve.