Gross Rating Point (GRP)

A term used to measure the size of an audience reached by a specific media vehicle or schedule. In the DOOH landscape, GRP means the total number of impressions delivered, expressed as a percentage of a market population. One rating point represents impressions equal to 1 percent of the market population. In the calculation of GRPs, total impressions must first be reduced to the in-market impressions of individuals who live in the defined market and are part of that market’s population base.