Cost per mille (CPM) / effective cost per mille (eCPM)

The price an advertiser pays for 1,000 impressions. Mille means “thousand” in Latin.

Because the actual cost per single impression is very, very small (sometimes as little as $.0015), the rate advertisers pay is calculated in cost per thousand.

CPM = total cost of campaign ÷ total number of impressions x 1,000.

eCPM is used to show what the CPM would have been if the advertiser purchased impressions instead of clicks or conversions.


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