When to use this calculator
CPM compares the price of exposure across campaigns but does not measure conversion quality.
Explore the marketing & customer calculators for other questions in this topic. For a related calculation, use the Customer Acquisition Cost Calculator: Estimate acquisition spending per new customer.
PUTTING IT INTO PRACTICE
CPM: a worked example
The values below are an illustrative example, not a recommendation. Replace them with measurements or assumptions that match your question.
| Input | Example value |
|---|---|
| Campaign cost | 200 |
| Impressions (integer) | 50,000 |
| Result | 4 per 1000 impressions |
- Check the input labels and enter the example values above.
- Apply the relationship: CPM = cost/impressions × 1000.
- The result is 4 per 1000 impressions, rounded for display.
How to interpret your result
Impressions are displays, not unique people or verified attention.
Define the event, audience and attribution window before calculating a rate. Clicks, customers and orders are different units. Acquisition cost and campaign CPA may cover different spending categories.
Frequently asked questions
Should I count unique users or total events?
Use the definition matching your metric. State it consistently because repeat events can produce a different rate from unique people.
When is the cpm calculator useful?
CPM compares the price of exposure across campaigns but does not measure conversion quality.
How do I use the cpm calculator?
Enter campaign cost, impressions (integer). The result updates automatically. Use the units shown beside each input; the example values illustrate the method.
Which formula does this calculator use?
CPM = cost/impressions × 1000.
What should I check before using the result?
Impressions are displays, not unique people or verified attention.
How are results rounded?
Scalar numbers display up to six decimal places, with scientific notation for very large or small values. Text, fraction, date and schedule outputs use the format described on the tool. Intermediate calculations use JavaScript floating-point arithmetic. Keep sensible precision for your measurements.
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