Impressions, Insertion Rate, Reach and eCPM are terms associated with programmatic monetisation. This article will provide context to help you interpret these metrics.


In audio streaming, impressions represent the number of times an audio ad is served or played to listeners. Each time an ad is successfully delivered and starts playing, it counts as an impression, regardless of whether the listener consumes the entire ad.

Insertion Rate

The insertion rate for audio streaming indicates the percentage of delivered ad impressions out of the total available ad opportunities within the audio stream. It is calculated by dividing the number of impressions by the total available impressions. A high insertion rate suggests that a significant portion of available ad inventory was utilized.


Reach in audio streaming refers to the total number of unique listeners who were exposed to an ad campaign during a specific time period. It represents the size of the audience reached by the ads within the audio streaming platform.


In the context of audio streaming, eCPM (effective cost per mille) represents the estimated revenue generated per thousand ad impressions. It is calculated by dividing the total revenue earned from the campaign by the total number of impressions, and then multiplying by 1000.