Glossary
CPM (cost per mille)
What you pay for 1,000 impressions of your ad.
Also called CPM, cost per 1,000 impressions
Formula
CPM = amount spent ÷ impressions × 1,000
Example
$300 for 20,000 impressions is a CPM of $15.
CPM reflects competition for your audience: it rises in Q4 and around big sales, for small or high-value audiences, and for ads Meta judges less relevant. A high CPM is fine if the cost per purchase still works.
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