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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 english is not good, sorry about that!

P.P.S. My question is not related to: http://superuser.com/questions/9946/how-to-choose-a-ups-calculate-power-for-a-new-pc

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84% accept rate
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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closed as exact duplicate by Nifle, quack quixote Apr 6 '10 at 22:36

This question covers exactly the same ground as earlier questions on this topic; its answers may be merged with another identical question. See the FAQ for guidance on how to improve it.

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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up vote 1 down vote

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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