CPM Calculator
Calculate cost per thousand impressions, or back out spend and impressions from a known CPM.
CPM
What it measures
CPM is the cost of a thousand impressions: spend divided by impressions, times a thousand. It is the currency of awareness buying.
Why it matters
CPM is how platforms price attention. Watching it tells you when an audience is saturating and when a creative refresh has bought you cheaper reach.
A worked example
2,000 of spend over 400,000 impressions is a 5.00 CPM.
How to read and improve it
Broaden audiences and refresh creative to fight CPM inflation. Narrow retargeting pools always carry premium CPMs.
Frequently asked questions
What is a normal CPM?
It varies wildly by platform, audience and season. Track your own baseline and watch the deviation.
CPM or CPC buying?
CPM suits reach goals, CPC suits response goals. On most platforms the algorithm decides anyway; the metric is for your read.
More in Paid media: ROAS Calculator · Break Even ROAS Calculator · PPC ROI Calculator
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