> ## Knowledge Base Index
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> Use this file to discover available pages before exploring further.
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# How are ad opportunities and fill rate calculated?

## Ad opportunities correspond to the number of times someone listened to an episode sequence which contains an ad slot

#### Example

  
*   You have an episode named 'Hello' with one pre-roll inserted
  
*   Last week, you decided to run a small campaign of 100 impressions
  
*   During last week, 500 people listened to 'Hello'
  
  
Your ad opportunities reach 500 whereas your actual impressions number is 100.  
  
Your fill rate can be calculated as following: (Impressions/Ad opportunities)*100, 20% in this case.