How to Calculate Kilowatt Hours to Watts


Each appliance that you have running in your home adds to your electric bill. Electric bills are calculated in kilowatt hours, which is the total amount of wattage used throughout your home during all of the hours in a payment period, usually a month. If you want to determine how many watts your home has used during a payment period, you can convert the kilowatt hours listed on your electric bill into watts.

  • Use the Micropyretics Heaters International watt calculator (see Resources). Enter the kilowatt hours used in one of your electric bills in the kilowatt box, change the time to one hour and click outside of the chart on the screen. The equivalent watts for the kilowatt hours that you have entered appear in the “watts” box on the right of the screen.

  • To do this calculation yourself, multiply the number of kilowatt hours from your electric bill by 1,000. A kilowatt is simply 1,000 watts and this gives you the total number of watts used during the billing period of your electric bill.

  • Figure out the number of watts used by day by dividing the number of watts from Step 2 by the number of days in the billing period.

  • Determine the number of watts used on average each hour of the day by dividing the daily watts used from Step 3 by 24.

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