CPM Calculator
CPM: CPM = cost ÷ impressions × 1,000. Methodology stated, your own inputs only.
In short
CPM: CPM = cost ÷ impressions × 1,000. Methodology stated, your own inputs only.
Formula: CPM = cost ÷ impressions × 1,000.
What this calculator does
CPM: CPM = cost ÷ impressions × 1,000. Methodology stated, your own inputs only. Worked example, questions and limitations included.
Use it to turn Currency (symbol only, never converted), Campaign cost, Impressions into a checked result you can compare, copy, or rerun with different assumptions.
The page shows the formula, a numeric worked example, and the assumptions that affect this marketing calculation.
Inputs and what they mean
- Currency (symbol only, never converted)
- — choice value.
- Campaign cost
- — number value.
- Impressions
- — number value.
How to use it
- Enter each value in the unit shown next to the box (use the unit converter first if your numbers are in other units).
- Check the breakdown to see every intermediate step.
- Read the limitations before relying on the result.
Formula
Methodology: IAB definition — cost per thousand ad impressions.
Impressions are as counted by your ad server or platform.
Viewable CPM (vCPM) uses viewable impressions instead.
CPM = cost ÷ impressions × 1,000.
Inputs used: Currency (symbol only, never converted), Campaign cost, Impressions.
Worked example
A display campaign
- 2,500 ÷ 400,000 × 1,000 = $6.25.
Reading the result
The headline figure is the main answer. Any breakdown underneath shows the parts that make it up, so you can check the working and see what changes when you adjust an input.
Limitations and assumptions
- Platform impression counts differ.
- Says nothing about results.
- Results are educational estimates built only from the figures you enter. They are not personalised investment, tax, legal or accounting advice. Rates, growth and discount assumptions are always yours to choose.
- The result depends on the values you enter for this cpm calculator; it does not supply missing rates, rules, prices, dates, or assumptions for you.
Reference: IAB
Last reviewed:
Common questions
Why per thousand?
Single impressions cost fractions of a cent; per-thousand is easier to compare. Check the formula, example, and limitations on this page before using the result for a real marketing decision.
CPM vs vCPM?
vCPM counts only impressions meeting a viewability standard. Check the formula, example, and limitations on this page before using the result for a real marketing decision.
What is a good value?
It depends on channel, audience and industry. We don't assume a benchmark — compare against your own campaigns.
How do I use the CPM Calculator?
Enter the required values for Currency (symbol only, never converted), Campaign cost, Impressions. The calculator applies the formula on this page and shows the main result with any supporting breakdown so you can check the arithmetic.
What formula does the CPM Calculator use?
CPM = cost ÷ impressions × 1,000. The visible formula section above lists the calculation path and the edge cases the page handles, so the result can be checked without relying on the form alone.
Can the CPM Calculator be used for exact decisions?
Use it as a calculation aid, not as a substitute for checking the underlying rule, contract, policy, or professional advice that applies to your situation. When a result depends on local rules, personal details, prices, or dates, enter those values yourself and confirm them before acting.
Sources
Method based on IAB.
Cite this page
Free Calculator. (2026, October 15). CPM Calculator. https://freecalculator.tech/tools/cpm-calculator
"CPM Calculator." Free Calculator, 15 Oct. 2026, https://freecalculator.tech/tools/cpm-calculator.
CPM Calculator — Free Calculator, https://freecalculator.tech/tools/cpm-calculator
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