How to Convert Kilowatts to Kilowatt Hours

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    Calculating kilowatt hours

    • 1). Find out how many watts a device uses per hour. Look on the label or in the instruction manual, or use Mr. Electricity's interactive chart at michaelbluejay.com (see Resources for link). A 60W light bulb obviously uses 60 watts per hour. An average laptop uses about 45 watts per hour.

    • 2). Multiply the wattage by .001 to get the kilowattage (kW). A 60W light bulb uses 0.06kW per hour, for example.

    • 3). Multiply the kW by the number of hours of usage to get the kW hours (kWh). A 0.06kW light bulb uses 1.44kWh in 24 hours.

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