Solve CPM, cost or impressions — enter any two.
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Understanding your result
CPM is common for awareness campaigns measured by reach rather than clicks.
Formula and method
CPM = cost ÷ impressions × 1000. So cost = CPM × impressions ÷ 1000.
Assumptions and limitations
CPM measures the cost of reach, not engagement or sales. Pair it with CTR and conversion-rate metrics to judge real performance.
Worked example
500 spent for 100,000 impressions is a CPM of 5.
How to use this tool
- Enter any two of cost, impressions and CPM.
- Press Calculate.
Common mistakes to avoid
- Entering impressions in thousands instead of the full number.
About the CPM Calculator
CPM is the cost per thousand impressions. Enter any two values to find the third.
Who should use this tool
Media buyers and marketers planning or comparing awareness campaigns priced per impression.
Benefits
- Solve for cost, impressions or CPM from any two values.
- Compare the price of reach across platforms.
- Forecast a campaign budget from a target reach.
Practical use cases
- Estimating spend for a target number of impressions.
- Comparing display and social ad pricing.
- Sanity-checking a media plan.
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Frequently asked questions
What does the M mean?
M is the Roman numeral for 1,000 — CPM is cost per mille (per thousand).