Cost Per Mille (CPM), also known as Cost Per Thousand (CPT), is the cost of buying a thousand impressions, calculated as Ad Spend over Impressions times by one thousand (Ad Spend / Impressions) * 1000.
Cost Per Mille (CPM), also known as Cost Per Thousand (CPT), is the cost of buying a thousand impressions, calculated as Ad Spend over Impressions times by one thousand (Ad Spend / Impressions) * 1000.