Illustrative media cost
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Measurement guide · Cost normalization
OOH CPM: simple formula, conditional comparison
CPM expresses cost per thousand impressions. The arithmetic is easy; the impression denominator is where comparability can break.
Illustrative impressions
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Illustrative CPM
Derived result
Verified record
What the sources support.
Claims below reproduce the scope of the page contract. Derived items show their calculation.
- verified
The MRC public-comment draft says OOH measurement techniques vary by format and location and that inherent limitations should be studied and disclosed.
- derived
CPM is calculated as media cost divided by impressions and multiplied by 1,000.
CPM = Cost ÷ Impressions × 1,000
01 / Analysis
Formula
CPM equals media cost divided by impressions, multiplied by 1,000. The same relationship can be rearranged to solve for spend or impression volume.
02 / Analysis
Worked example
A $50,000 media cost divided by 2,500,000 modeled impressions and multiplied by 1,000 produces a $20 CPM. This example demonstrates the formula only.
03 / Analysis
The denominator test
Before comparing CPMs, align the impression definition, audience, period, geography, included fees and media scope. A lower CPM is not inherently better if it uses a broader or differently modeled denominator.
Source desk
Sources for this page
- Media Rating CouncilNovember 2023 draftOOH Measurement Standards — Public Comment Draft (opens in a new tab) ↗
Used for: OOH measurement terms, format-dependent techniques and disclosure of limitations.
- OAAACurrent guide pageOOH Measurement & Analytics Guide (opens in a new tab) ↗
Used for: Planning, transaction, measurement and attribution concepts.