The Metric Confusion: CPM vs RPM If you're a content publisher looking to optimize your ad revenue, you've likely stumbled upon two terms again and again—CPM and RPM. Both are critical metrics, yet many confuse one for the other. Worse, they often focus on the wrong one when evaluating performance. While these metrics sound similar, they reveal very different aspects of your monetization strategy. Let’s break them down, compare them, and help you understand when to use each one and why. What Is CPM? CPM (Cost Per Mille) represents how much advertisers pay for every 1,000 impressions of an ad. This is the rate you get from the demand side—the buyers who compete in ad exchanges or direct deals. It reflects how valuable your inventory is to advertisers. CPM is a per-unit price metric . It shows the value of each impression but doesn't consider how many ads you show on a page or how much you make in total. CPM Quick Example If you have a CPM of $2.50, it means an ...
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