How To Calculate The Power Consumption Of A Device. To calculate the energy consumption cost start by multiplying the wattage of the device by the average number of hours you use it each day. You can calculate the consumption of an electrical device when you know the devices power measured in watts W and the amount of time it is used for.

And the only real. At first glance you might mistake the power specs as what it takes to run a refrigerator 247. So if you have a 120-watt television that you use four hours per day.
If you want to calculate the monthly power consumption by your electrical device then the number of days use30.
As mcg mentioned for calculating an estimated life you need to figure out an average consumption this is the average consumption on a period of time equal to a repeatable cycle in your application. To find the energy cost of your appliance select a device from the list below. I have seen it in datasheets but I am confused. OR Should I calculate Power for a complete device.

