You will see the term “fill rate” or “inventory fill rate” throughout the MoPub interface. This value is shown as a percentage how much of your inventory is met with ads from your various ad sources.
However, the way this value is determined will vary depending on the tab or table that you are viewing because MoPub enables you to work with many different types of advertising sources (i.e. ad networks, MoPub Marketplace, direct partners). A given ad request can attempt multiple ad sources.
The “Fill Rate” column on the App and Ad Unit tabs is calculated the same way as the “Inventory Fill Rate” at the top of the Dashboard. It represents how often that specific ad unit or app has received an ad across all ad sources, over the date range selected. For example, an ad unit may receive ads from a Guaranteed Line Item, multiple ad networks, and MoPub Marketplace.
The “Network Fill Rate” at the top of your Networks tab in the summary metrics represents your overall fill rate across all your networks (excluding network line items). It is calculated based on how often your inventory that is available to ad networks has received an ad from any network.
On the same page below the summary metrics, the “Fill Rate” in your Networks table shows how often each specific ad network has returned an ad impression, divided by the number of attempts that network has received.
Within a “Networks Segment Detail” page, the “Fill Rate” columns shows how often an ad has shown for each specific ad unit and network combination over the date range selected.
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Last updated August 28, 2021
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