How to use it
- Enter work or energy and select J, kJ or Wh.
- Enter elapsed time and choose seconds, minutes or hours.
- Calculate to view watts and kilowatts.
Power Calculator
Calculate average power from an amount of work or energy and elapsed time.
Important: This calculator is for educational and estimation purposes only. It is not engineering, safety, operational, or professional advice. Always consult a qualified professional for real-world applications.
About the Power Calculator
This calculator finds average power by converting energy and time to joules and seconds.
Formula and logic
Average power is P = W ÷ t. One kilojoule is 1,000 J and one watt-hour is 3,600 J.
Example
Using 3,600 J over 60 seconds gives an average power of 60 W.
Notes
This is an average over the entered interval and does not show instantaneous peaks, losses or device behavior.