How To Calculate Power Consumption Of Electrical Appliances. Check the power tags or better yet measure the amperage draw with a clamp-on ammeter or home energy monitor like a Kill-A-Watt meter. One kilowatt is equal to 1000 watts so to calculate how many kWh a device uses divide the watt-hours from the previous step by.
Electricity is measured in kilowatt-hours abbreviated kWh. Electricity on your bill is measured in kilowatt-hours kWh not watt-hours. Our appliance and electronic energy use calculator allows you to estimate your annual energy use and cost to operate specific products.
The calculation is the following.
Electricity Usage Per Year Watts 1000 HoursDay DaysWeek WeeksYear. If you want to know exact power consumption of any of your appliances then the most accurate way is to use a Kill A Watt. For example an AC marked with a. How do you calculate power consumption of an appliance.
