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Why does CPM in adsense fluctuate so much?

  1. Dorsi profile image91
    Dorsiposted 9 years ago

    I was wondering how this CPM works, I read the google info on it and still don't quite understand it. My CPM went from dollars to cents, and has been dropping daily- what causes this?

    (From Google:
    Google Help › AdSense Help › AdSense Basics › Google AdSense Guides › › Effective CPM 
    Effective CPM

    From a publisher's perspective, the effective cost-per-thousand impressions (eCPM) is a useful way to compare revenue across different channels and advertising programs. It is calculated by dividing total earnings by the number of impressions in thousands. For example, if a publisher earned $180 from 45,000 impressions, the eCPM would equal $180/45, or $4.00. However, please keep in mind that eCPM is a reporting feature that does not represent the actual amount paid to a publisher.)

  2. pauldeeds profile image
    pauldeedsposted 9 years ago

    If your daily adsense click counts are in the single digits or low double digits you are probably just seeing normal statistical fluctuations -- one or two clicks either way can have a big impact on CPM.  To get a realistic picture of broader trends you should look at chunks of say 20 or 30 thousand impressions (perhaps a week, or a month worth).

    One other thing, some of your more popular hubs are political.  I'm guessing the supply of political ads dropped precipitously after election day, which would impact both your click through rate and the revenue you earn per click ...

    1. Dorsi profile image91
      Dorsiposted 9 years agoin reply to this

      Thanks Paul. That's probably why I made over half my adsense earnings in Nov. I've been experimenting with different topics and thought since I was passionate about Obamas election it would be a good thing to write about.Too bad we couldn't have an election every month....sigh.......

  3. knslms profile image73
    knslmsposted 9 years ago

    Only changes when your page views change.