EV Charging Time Calculator
Estimate how long an EV takes to charge for a given battery, charger power and state of charge.
About the EV Charging Time Calculator
Enter the usable battery capacity, the charge you're starting from and charging to, the charger's power, your car's maximum AC charging rate and a charging efficiency. The calculator gives the time and the energy added.
Charging time is energy added ÷ effective charging power. On AC the car's onboard charger limits power (often 7–11 kW). DC rapid chargers deliver much more but taper as the battery fills, so 10–80% is the usual quoted figure.
The formula
Time = battery × (to% − from%) ÷ (power × efficiency)
Worked example
A 75 kWh battery from 10% to 80%
- Energy added: 75 × 70% = 52.5 kWh
- On a 7.4 kW home wallbox at 90% efficiency: 7 h 53 min
- On a 50 kW DC charger: about 1 h 10 min, longer as it tapers
Questions people ask
Why is my car slower than the charger's rating?
The car's onboard charger, battery temperature and state of charge limit it.
Is fast charging bad for the battery?
Occasional use is fine; frequent DC charging to 100% adds wear.
What does a charge cost?
Energy from the wall (added ÷ efficiency) × your price per kWh: 58.3 kWh at 0.25 is about 14.60.