CPM measures the average cost to generate one thousand impressions. CPM tells you how expensive it is to buy reach or visibility before the user clicks.
CPM tells you how expensive it is to buy reach or visibility before the user clicks.
| Field | Detail |
|---|---|
| Definition | CPM measures the average cost to generate one thousand impressions. |
| Formula | (Spend / Impressions) x 1,000 |
| Why it matters | CPM is a strong signal for auction pressure, audience competitiveness, and media buying efficiency at the impression level. |
| Good benchmark context | CPM should be benchmarked by channel, placement, audience, geography, and seasonality because impression costs change quickly across those factors. |
Glossary entries should explain where interpretation goes wrong, not just repeat a formula.
| Common mistake |
|---|
| Treating a low CPM as automatically good when traffic quality is weak. |
| Comparing high-intent search CPM logic to paid-social or display CPM logic. |
| Ignoring how frequency, creative fatigue, and audience saturation can inflate CPM over time. |
CPM is a strong signal for auction pressure, audience competitiveness, and media buying efficiency at the impression level.
CPM tells you how expensive it is to buy reach or visibility before the user clicks.
CPM should be benchmarked by channel, placement, audience, geography, and seasonality because impression costs change quickly across those factors.
CPM tells you how expensive it is to buy reach or visibility before the user clicks.
CPM should be benchmarked by channel, placement, audience, geography, and seasonality because impression costs change quickly across those factors.