CPM

Plain English definition

Cost per one thousand impressions—how you buy or compare reach buys.

It helps you compare reach deals before you multiply by CTR to estimate clicks.

At $15 CPM, $750 buys roughly 50,000 impressions before frequency caps.

Ad spend per thousand impressions—reach efficiency before clicks exist.

Solve impressions from dollars spent divided by negotiated CPM (per thousand impressions).

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