Select GRP, reach, average campaign frequency, gross impressions, or audience universe. Use the same audience definition and campaign period; K and M scale counts by thousands and millions.
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GRP Formula
The following formula is used to calculate the gross rating points.
- Where GRP is gross rating points
- R is the reach percentage (percentage of people that are reached by a program)
- AF is the average number of campaign advertising exposures per viewer reached (for example, five episodes with one campaign ad each gives five exposures).
To calculate gross rating points, multiply the reach percentage by the average frequency per viewer reached.
GRP Definition
What is GRP?
GRP, short for gross rating points, measures gross advertising exposure weight for a defined audience and campaign period. It includes repeated exposures, can exceed 100, and does not by itself measure sales impact or unique audience reach.
Example Problem
How to calculate GRP?
First, determine the reach percentage of the medium. For this example, there is a popular television show that reaches 15% of the adult population in the country of analysis.
Next, determine the campaign’s average exposure frequency among people reached. If each reached viewer is exposed to all five placements of this campaign’s ad, the average frequency is 5.
Finally, calculate the GRP using the formula above:
GRP = R% * AF
GRP = 15 * 5
GRP = 75 points
