PR Value Calculator

This calculator prices earned coverage the way a media buyer would price the same reach: impressions divided by a thousand, multiplied by the cost per thousand of comparable paid advertising, with a flat premium added for each mention in a high-authority outlet. At the defaults, 5,000,000 impressions at a CPM of 10 gives 50,000, three tier-1 mentions at 5,000 each add 15,000, and the total is 65,000. Impressions supply 76.9% of that figure and the tier-1 premium the remaining 23.1%.

The method is advertising value equivalency, and the communication measurement field has moved away from it. The Barcelona Principles, maintained by AMEC and now in a fourth version, hold that advertising value equivalents are not the value of communication, and AMEC runs a standing campaign against their use. The objection is not that the arithmetic fails but that it prices reach and stops there, so it says nothing about whether anyone acted. A single placement that moves demand and a placement nobody read produce the same number here if their impression counts match.

The impression count itself carries an assumption. Publisher-reported reach is not the same as an ad impression counted under a measurement standard, and the two differ again from an impression a person actually saw. The IAB Tech Lab maintains the technical standards and viewability specifications that define the paid-side numbers a CPM is normally attached to, and earned coverage rarely comes measured to that level. So the CPM being applied and the impressions it is applied to are both estimates, multiplied together.

Quick example

With media impressions of 5,000,000 and ad equivalent cpm of 10 (plus tier-1 mentions of 3 and tier-1 value per mention of 5,000), the result is 65,000.00. The supporting rows split that into 50,000.00 of impression value and 15,000.00 of tier-1 value.

Which inputs matter most

Impressions and CPM are interchangeable in the arithmetic and each carries a 10% rise into a 7.69% rise in the total. Tier-1 count and value per mention behave the same way as each other, at 2.31% for the same 10% move. The CPM input is where the real leverage sits, because its accepted range is wide: holding everything else at the defaults, a CPM of 1 produces 20,000 and a CPM of 200 produces 1,015,000. That is a fifty-fold spread driven by one judgement call, which is why the figure travels better as a range than as a single number. There is also a double-count to watch: one tier-1 mention valued at 5,000 is worth the same as 500,000 impressions at a CPM of 10, and those mentions almost always generated impressions that are already inside the impression total, so the premium is added on top of coverage the first term has counted once already.

What's happening under the hood

Impression value is impressions divided by 1,000, multiplied by the CPM. Tier-1 value is the mention count multiplied by the value per mention. The total is the two added together. There is no cost input anywhere in the model, so nothing here is a return on investment: comparing the 65,000 output against a campaign spend of 30,000 gives a ratio of 2.17 to one, but that division happens outside this calculator, and the spend figure never enters it.