How much does it cost to run a computer for a month?

ANSWERS: 1

Official Know-It-All

The average computer uses about 120 watts per hour and a monitor uses about 150 watts per hour. Based on the average kilowatt hour rate of $0.09 an hour, a computer left on for an entire month would cost approximately $17.50. You can find this by taking 270 watts per hour, times 24 hours a day, times 30 days, divided by 1,000 to turn watts into kilowatts, multiplied by $0.09.
Source:
Energy Savers.gov
EIA: Electricity Data

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