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GRP / TRP

Gross & target rating points

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Formula

GRP = Reach % × Frequency

Definitions

GRP: Gross Rating Points — reach % of the total audience multiplied by average frequency.
TRP: Target Rating Points — the same calculation against the target audience instead of the total population.
Reach: The percentage of the audience exposed at least once.
Frequency: The average number of times each person was exposed.

How to use it

GRP = Reach % × Frequency. 70% reach at a frequency of 4 is 280 GRPs.
TRP uses the identical formula, measured against the target audience.
Equivalently, GRP = (Impressions ÷ Audience) × 100.

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