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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