CPM
CPM is the price of a thousand impressions, the base currency every downstream ad metric is built on.
What CPM is
CPM, cost per mille, is the price of a thousand impressions: what advertisers pay for the ad to be shown a thousand times, the base currency of auction-bought attention.
Why CPM matters
It’s the rent on the audience: every performance metric downstream, cost per click, per purchase, per customer, is built on what the thousand impressions cost going in. Rising CPMs are the quiet tax on the whole D2C model, and buyers watch them the way shippers watch fuel: not controllable, but priceable into everything.
Reading CPMs like a buyer
- Audience and season set the floor: competitive segments and Q4 auctions cost more
- Creative earns discounts: engaging ads win auctions cheaper on most platforms
- CPM alone judges nothing: cheap impressions that never convert are expensive
- Trend it per placement: the same budget buys shrinking reach as CPMs climb
Frequently asked questions
Why do CPMs keep rising?
Auction math: more advertisers bidding on finite attention, especially in peak seasons and proven placements. The compounding answer isn’t cheaper impressions but better use of each one, creative, conversion, and retention doing more per thousand.
When does CPM buying beat CPC?
When you trust your creative’s math: CPM pays for exposure and keeps the click upside, rewarding ads that outperform the auction’s expectations; CPC transfers click risk to the platform at a markup. High-performing creative usually nets cheaper on CPM.