Gross Rating Point

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GRP (short for Gross Rating Point) is the sum of ratings achieved by a specific media vehicle or schedule. It represents the percentage of the target audience reached by an advertisement. If the advertisement appears more than once, the GRP figure represents the sum of each individual GRP. In the case of a TV advertisement that is aired 5 times reaching 50% of the target audience, it would have 250 GRP = 5 x 50% -- ie, GRPs = frequency x % reach.

A related metric, TRPs, or Television Rating Point, is a measure of the purchased targeted rating points representing an estimate of the component of the targeted audience being reached by an advertisement.

Gross Rating Points (GRP) measure the total volume of delivery of your message to your target audience. It is equal to the percent Reach to your target audience times the Frequency of exposure. To arrive at your total Gross Rating Points, add the individual ratings for each media vehicle you are using. You may also get GRP by dividing your gross Impressions by the population base and multiplying the answer by 100.

The GRP is a basic measure helping eg the broadcast company to sell their advertisement space to the potential customers.