How to calculate PC power consumption?

Ok, let's say my overall system power draw is a constant 300W. Would the formula for Watt-hours be 300W * 5 hours usage per day / 1000? And once we get the number, is the formula for calculating daily cost gonna be 1.5Wh : 1000 (to get kilowatt-hours), and then that number times $0.13 (the average per kWh cost in the US)?
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  1. Yes, you seem to have it.

    https://www.rapidtables.com/calc/electric/electricity-calculator.html
    Quote:
    Energy consumption calculation

    The energy E in kilowatt-hours (kWh) per day is equal to the power P in watts (W) times number of usage hours per day t divided by 1000 watts per kilowatt:
  2. ANDstriker said:
    Ok, let's say my overall system power draw is a constant 300W. Would the formula for Watt-hours be 300W * 5 hours usage per day / 1000? And once we get the number, is the formula for calculating daily cost gonna be 1.5Wh : 1000 (to get kilowatt-hours), and then that number times $0.13 (the average per kWh cost in the US)?

    That's right, except you already have it in kWh after you divide the number by 1000 the first time. So if you draw 300 W for 5 hours a day, you're using 1.5 kWh per day. Which would cost you ~20 cents at $0.13 per kWh.
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