Why You Need to Understand Both Metrics When it comes to earning money through ads, many publishers focus only on CPM. But CPM alone doesn’t tell the full story. Fill rate plays an equally critical role—and ignoring it can leave revenue on the table. To truly optimize your monetization, you need to understand how these two metrics interact and how to balance them for better returns. What Is Fill Rate? Fill rate is the percentage of ad requests that result in an actual ad being shown. If your site makes 1,000 ad requests and only 800 of those deliver an ad, your fill rate is 80%. A low fill rate means your site has unused ad space that could be earning money. High fill rate means you're successfully monetizing most of your available inventory. What Is CPM? CPM stands for cost per mille, or the amount an advertiser pays for every 1,000 ad impressions. It measures the value of the impressions that are actually served, not just requested. So, even if your fill rate is high,...
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