Target Rating Points (TRPs)

target rating pointsDefinition

Target rating points (TRPs) quantify the gross rating points achieved by an advertisement or campaign among targeted individuals within a larger population.

TRPs are calculated as a percentage using for the denominator the total target audience and for the numerator the total impressions delivered to the target audience multiplied by 100.

TRPs (%) = Target Impressions (#) ÷ Target Audience (#) x 100

As an example:

1,000,000 impressions among the target audience ÷ 10,000,000 people in total in the target audience x 100 = 10 TRPs

TRPs can also be calculated from GRPs:

TRPs (%) = GRPs X (% of GRPs Delivered to Target / Target % of Population) x 100

Alternatively, TRPs can be calculated using the target specific reach and frequency:

TRPs (%) = Target Reach (%) × Average Target frequency (#)

TRPs are often added up by week and presented in a flowchart so a marketer can see the number delivered to the target audience from each media channel.

Share-Based TRPs, a related concept sometimes colloquially called TRPs, is the estimated proportion of GRPs delivered to the target:

Share-Based TRPs = GRPs X Estimated Percent of GRPs Delivered to Target

The Share-Based TRPs approach may not yield the same result as the traditional calculations of TRPs. In particular, this formulation does not necessarily yield a value equal to the reach times the frequency. It is critical to understand which approach is being used in each application.


  1. Common Language in Marketing Project, 2021.

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