What is GRP?

Gross rating point (GRPs) is a term used in advertising to measure the size of an audience reached by a specific media vehicle or schedule. It is the product of the percentage of the target audience reached by an advertisement, times the frequency they see it in a given campaign (frequency × % program rating). Frequency = number of spot that we had air % program rating ( we got from the survey) % Reach = know Through the Reach Curve after we got the total GRPs( TRAPs). For example, a television advertisement that is aired 5 times reaching 50% of the target audience each time it is aired would have a GRP of 250 (5 × 50%).