How Many Watts Does a Laptop Use?

Answer
50 W typical (30–100 W)

A laptop uses about 50 watts while running. At a typical 6 hours a day that is 9.0 kWh per month, or about $1.53 at $0.17/kWh. The charger rating (for example 65 W) is the maximum, not the average.

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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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    Laptop power use at a glance

    Value
    Typical running watts50 W
    Range30–100 W
    Current at 120 V0.4 A
    Typical use6 h per day
    Energy per day0.30 kWh
    Energy per month9.0 kWh
    Cost per month ($0.17/kWh)$1.53
    Cost per year$19

    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 laptop on a generator?

    Yes. Choose a generator whose running watts exceed 50 W.

    How many amps does a laptop draw?

    About 0.4 A at 120 V.

    Open the full calculator: Electricity Cost Calculator →