How to Calculate Net Effective CPM

1. Write down how many hits or page impressions your website has over a given period of time. AdSense defines a page impression as the number of times a user visits a page that contains at least one advertisement. Pages with multiple ads only count as one page impression.

2. Divide the amount your web page earned in that time by the number of impressions. If your earnings for one month were $10 and you had 150 page impressions then your equation is 10 divided by 150, which equals .06667.

3. Multiply your answer by 1000. In our example, .6667 multiplied by 1000 equals an effective CPM of 66.67, or estimated earnings of $66.67 for that time frame.