dre's page view should be very low and CPC high if his eCPM goes up.. Effective CPM - Cost per 1000 impressions. From a publisher's perspective, CPM 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 CPM would equal $180/45, or $4.00.