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How can I calculate power consumption of my PC in Watt?

I need to investigate how much power my Linux machine uses per week. I can take a look at the PSU but I would like to know how to calculate the average use of power it takes.

I also need to know how much power a CRT screen use per week.

Do I need to check the PSU Watt unit and Screen Watt usage and just add both to have the results?

P.S. My question is not related to: How to choose a UPS / calculate power for a new PC

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possible duplicate: superuser.com/questions/123009/… –  quack quixote Apr 6 '10 at 19:49
    
All of them are not related to my question. Maybe I was not clear but I need to know how to calculate, with the Watt info of my PSU, the average use of it for a week. –  r0ca Apr 6 '10 at 19:55
    
the answers to 123009 are exactly the answers that you will receive here. –  quack quixote Apr 6 '10 at 20:13
    
My bad. I did not read 123009 completely. Thanks for the info. I have to say that I bought the Kill a Watt thing... –  r0ca Apr 6 '10 at 21:27
    
that's ok, it was in rough shape and had been incorrectly closed-as-dupe of the calculate-power-supply-capacity questions. hopefully it's a little better now; thanks for making me take another look. –  quack quixote Apr 6 '10 at 22:35
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marked as duplicate by Nifle, quack quixote Apr 6 '10 at 22:36

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2 Answers

up vote 3 down vote accepted

Use a Kill A Watt or similar device. Just plug it in and set it to display total kWh.

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I have a Kill A Watt. It works great, and it's cheaper than other name brand alternatives. –  Marcus Adams Apr 6 '10 at 22:17
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The only way to do it is to measure the power - you can get cheap power meters these days for 10 - 20 Euros (or USD). Measure the power at idling and when the computer is busy. Then convert this to total kWh per week or whatever.

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