EV Charging Time Calculator
Estimate charging time from battery charge change, average input power and efficiency.
Your result
EVERYDAYEnter your values and select calculate.
On this page How it works & practical examples
How to use the EV Charging Time Calculator
Use usable battery capacity and an average power appropriate to the charge interval. The charger energy row distinguishes grid-side energy from energy added to the battery.
The calculation
Worked example
A 60 kWh battery going from 20% to 80% needs 36 kWh added. At 7.2 kW input and 90% efficiency, the constant-power estimate is 5.5556 hours.
Assumptions and limits
High-charge tapering, thermal control, shared chargers and vehicle power limits can alter the average. Starting and target percentages do not determine a real charge curve, so this is not a guaranteed completion time.
Common questions
Can I enter the charger’s advertised peak power?
Only if that reasonably represents average input over the interval; a peak often overestimates sustained power.
Why is charger energy larger than battery energy?
An efficiency below 100% accounts for part of the input energy not becoming stored battery energy.