The CPM formula
CPM = (campaign cost ÷ impressions) × 1,000
If a campaign costs $1,250 and delivers 250,000 impressions, its CPM is $5.00.
Reverse formulas
Cost = CPM × impressions ÷ 1,000
Impressions = budget ÷ CPM × 1,000
CPM formula explained
Learn how to calculate CPM, campaign cost, and impressions with practical examples.