GRP (gross rating point)
A GRP, or gross rating point, is a measure of advertising weight that expresses a campaign’s total impressions per hundred people in the target audience
What it means, how it is used and where it comes up, with its related concepts.
What it is and how it works
It is calculated by multiplying reach, as a percentage of the target audience, by average frequency. A campaign reaching 50% of its target with an average frequency of 4 delivers 200 GRPs. It is used mainly in television, radio and outdoor to plan and compare campaigns; when based on a specific target rather than the whole population, the term TRP (target rating point) is often used.
Because it adds up repeated exposures, it does not show on its own how many different people saw the campaign: 100 GRPs could mean the whole audience once or a quarter of it four times. It is therefore read alongside reach and frequency.
Also known as
Gross rating point, TRP
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