ClarityHow to use this tool
- Enter advertising spend, impressions.
- Select Calculate to view the result.
- Check the method and assumptions below before using the result.
Input reference and sample values
Use the units and choices shown for each field. Sample values are provided for practice, not as recommendations.
| Input | Format and units | Sample |
|---|---|---|
| Advertising spend | Numeric value. Unit: money. Zero or positive. | 750 |
| Impressions | Numeric value. Minimum: 1. | 150000 |
Result for these sample inputs
5 currency units
- Total spend
- 750
- Impressions
- 150000
Select Try the example in the form to load these values and calculate them again. This replaces the current form inputs. Compare the result with the method and worked explanation below.
The method, explained
CPM = total spend ÷ impressions × 1,000. The result is the average cost for one thousand recorded impressions.
A spend of 750 across 150,000 impressions gives a CPM of 5. At the same observed rate, 1,000 impressions cost 5.
What to keep in mind
An impression is a recorded ad display, not necessarily a unique person or a viewable impression. Use viewable impressions only if you intend to calculate a viewable CPM.
Common questions
Are impressions the same as reach?
No. Reach counts distinct people under a platform’s rules, while the same person can generate multiple impressions.
Can CPM predict sales?
No. CPM measures the cost of exposure. Clicks, conversions and revenue need separate measurements.
Methodology maintained by ClarityKit. How these tools are built and checked.