kW to kWh Calculator
Enter power in kW and the duration it remains active to calculate kWh.
A QUICK WALKTHROUGH
How to use this tool
- Enter power in kW.
- Enter a positive duration and choose hours, minutes, or seconds.
- Review the energy estimate in kWh.
Constant-power assumption
Assumes constant power for the entire entered duration. It does not measure changing load, standby use, or losses.
Formula
Energy (kWh) = power (kW) × duration (hours)
GOOD TO KNOW
Common questions
Do I need to enter a duration?
Yes. Energy requires both power and elapsed time; this tool cannot calculate kWh from kW alone.
Does it model changing power?
No. It assumes the entered kW value remains constant for the full duration.