Kilowatt hour consumption formula

[mad3]

I am trying to calculate the power consumption on my computer, monitor, Refrigerator, TV's and portable air conditioner. I am looking for a formula that I can take information from the devices to calculate the usage.

Thanks,

Mike

 

[steve the fish]

Wattage of machine * number of hours powered up / 1000

 

[mad3]

Thanks!