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💰 Cost Per Mille

The cost an advertiser pays for one thousand ad impressions.

Cost Per Mille

Cost per mille is the price of a thousand impressions. Mille is Latin for thousand, which explains the odd spelling. Advertisers use CPM to compare the cost of reach across channels and placements.

A premium video placement on a major news site might carry a twenty-dollar CPM. A programmatic banner on a smaller site might cost less than a dollar. The gap reflects audience quality, context, and demand.

What pushes CPM up

CPM is a cost metric, not a performance metric. Buying the cheapest impressions often means buying the least valuable ones. Context still matters.

Comments (3)

  1. Ad Buyer
    CPM is the first metric I check when comparing campaigns. It tells you so much about audience and placement.
  2. Jenny T.
    I run a small blog and never understood why advertisers talked about CPM. Now it makes sense.
  3. Mark D.
    Is CPM the same across all platforms or does it vary wildly? Just curious about benchmarks.

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