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In the digital advertising ecosystem, maximizing ad revenue and optimizing using available ad inventory are key priorities for publishers. One important metric that assists assess the efficiency of ad inventory is the fill rate. A high fill rate suggests that a publisher is effectively monetizing their available ad space, while a minimal fill rate could signal missed opportunities for revenue. In this article, we'll explore what fill rate is, how it's calculated, and why it's important for publishers and advertisers alike. We’ll also cover factors that influence https://propellerads.com/blog/fill-rate/ and exactly how publishers can improve it. What is Fill Rate? Fill rate refers to the percentage of ad requests which are successfully full of an ad. When a publisher’s website or app sends a request for an ad to be displayed (an ad request), the ad network or demand-side platform (DSP) responds by serving an advertisement. The fill