CPM is a fairly standard unit of measure in the online advertising business.
It stands for **Cost per thousand** (the M is the Roman numeral for 1,000). What it’s measuring is the **cost per thousand [ad impressions] [ad-impression]**.
Take [heisel.org](http://heisel.org) for example. For the month of November I had a little more than 1,000 [page views] [page-view]. If I sold ads, and if I sold them at a $5 CPM, then I’d have roughly $5 in revenue for the month.
A simple number that belies even more to talk about, but I’ve got a tree to decorate, so that’s all for tonight.
[ad-impression]: http://heisel.org/blog/2008/11/29/ad-impressions/
[page-view]: http://heisel.org/blog/2008/11/13/what-is-a-page-view/
Chris Heisel 
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Thanks for this. Found it useful.
interesting, spcially “M” in CPM. greatfull
Thank you I was trying to figure this out because I wanted to advertise my website getpaidweekly.com and i had no clue what it meant and was curious to find out
Its very useful info, I dont know about cpm before reading this post. Thanks for sharing
http://celebpix.in/
Thank you for making it easy to understand !!
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Thanks!
Thanks. I found this very helpful