How Many Watts Does a Desktop Computer Use?

Answer
200 W typical (60–500 W)

A desktop computer uses about 200 watts while running. At a typical 6 hours a day that is 36.0 kWh per month, or about $6.12 at $0.17/kWh. Office PCs use under 100 W; gaming PCs can pull 400–600 W under load.

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How we calculated this

    For estimating and educational purposes only. Results are approximate and are not a substitute for a licensed professional, the manufacturer's instructions or your local code. Disclaimer

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    Desktop Computer power use at a glance

    Value
    Typical running watts200 W
    Range60–500 W
    Current at 120 V1.7 A
    Typical use6 h per day
    Energy per day1.20 kWh
    Energy per month36.0 kWh
    Cost per month ($0.17/kWh)$6.12
    Cost per year$74

    Check the label on your appliance for its exact rating. The calculator above uses your own watts, hours and electricity rate.

    Frequently asked questions

    Can I run a desktop computer on a generator?

    Yes. Choose a generator whose running watts exceed 200 W.

    How many amps does a desktop computer draw?

    About 1.7 A at 120 V.

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