Measurement
Cost Per Mille (CPM)
CPM is a pricing metric representing the cost for one thousand ad impressions. The word mille means one thousand.
CPM provides a normalized way to compare impression-based media prices across campaigns, placements, publishers and programmatic transactions.
How it works
- Count the billable impressions.
- Divide impressions by one thousand.
- Multiply that value by the CPM price to calculate media cost.
Frequently asked questions
How is CPM calculated?
CPM equals media cost divided by impressions, multiplied by 1,000.
Is a lower CPM always better?
No. Media quality, audience value, viewability, outcomes and fraud risk matter alongside price.