KnowledgeCost per Mille
CPM · How much it costs to show an ad 1,000 times.
Understand CPM in context.
Simply explained explanation
How much it costs to show an ad 1,000 times.
Professional explanation
Cost per thousand served impressions; the standard comparable buying-efficiency rate for impression-led inventory.
Analytical explanation
Investigate CPM alongside audience saturation, frequency, placement and viewability. A rising CPM can still be acceptable if downstream outcomes improve.
Technical explanation
(Spend ÷ impressions) × 1,000. Verify whether the platform reports served, measurable or viewable impressions before comparing.
Four complementary explanations — choose your level. Technical definitions are platform-specific where noted.
↗ How to use it
Compare delivery and business outcomes together.
⚠ Common interpretation mistake
CPM is not the price of 1,000 unique people reached.
Metric calculator
Adjust the inputs to see how the metric is calculated.