Calculate the Impact of Use of an Appliance or Device on your Monthly Electric Bill
with Kill-A-Watt® Electricity Monitors

There are three types of usage you can monitor.

  1. To monitor a device that runs all the time, such as a refrigerator, cordless telephone or “phantom load”—the power used by certain devices even when they’re not being used—leave it plugged in for an hour.
  2. To monitor a device you use only for a few hours each day, such as a lamp or space heater, plug it into the Kill-A-Watt just before turning it on, and leave it plugged in for an hour. Keep track of how many hours per day you use the item.
  3. To monitor a device you use only once or twice each day, such as a coffee maker, hair dryer or toaster, plug it into the Kill-A-Watt, turn the appliance on, and read out the kilowatt hours after the appliance shuts off.
Calculate Cost of Usage for One Month











Cost for using this appliance or device for one month is:  

The formula for calculating the cost of an appliance or device for a month is:
[kilowatt readout] x[frequency of use] x30 (days in a month) x17¢ (the average cost of a kilowatt in Maine)

Examples:

a refrigerator
[.3 kWh (1 hour readout)]x[24 hours per day]x[30 days]x[17¢] = $36.72 per month

a 1,300-watt microwave oven used 3 minutes 5 times a day
[.065 kWh (one use readout)]x[5 uses per day]x[30 days]x[17¢] = $1.66 per month


Program Information: http://www.efficiencymaine.com/residential_programs.htm

Calculator and Examples derived from: Efficiency Maine Kill-A-Watt® Energy Detector Complete Instructions


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