GRP (Gross Rating Points) Calculator

Enter Calculation

Reach (%)

Average Frequency

Results

Gross Rating Points

240

GRP

Reach	60%
Average Frequency	4
Formula	Reach × Frequency

What Are Gross Rating Points (GRP)?

Gross Rating Points (GRP) is a standard advertising metric that measures the total weight or intensity of a media campaign delivered to a target audience. One GRP equals 1% of the target audience exposed one time. GRPs combine two ideas — how many people you reach and how often — into a single number that lets planners compare campaigns and media schedules on a common scale.

How to Use This Calculator

Enter your campaign Reach (%) — the unique percentage of the target audience exposed to the message at least once — and the Average Frequency — the mean number of times that audience saw the ad. The calculator multiplies the two values and returns your total GRP. Reach is capped at 100% because you cannot reach more than the entire audience.

The Formula Explained

The relationship is simple:

$$\text{GRP} = \text{Reach (\%)} \times \text{Frequency}$$

Because reach is already expressed as a percentage, GRP is reported as raw rating points rather than a percentage. For example, reaching 50% of the audience an average of 3 times yields 150 GRPs. The same 150 GRPs could also come from 75% reach at a frequency of 2, which is why GRP alone does not tell the whole story — reach and frequency trade off against each other.

GRP is reach (%) multiplied by average frequency.

Worked Example

Suppose a television campaign reaches 60% of its target market, and each person sees the spot an average of 4 times.

$$\text{GRP} = 60 \times 4 = \textbf{240 GRPs}$$

If you later wanted 300 GRPs at the same 60% reach, you would need to raise frequency to 5 (\(300 \div 60\)).

Reach covers the audience touched; frequency counts how often, together forming GRP.

FAQ

Is GRP the same as TRP? Target Rating Points (TRP) use the same math but apply specifically to a defined target demographic, while GRP can refer to the general population.

How do I get reach and frequency back from GRP? Reach = GRP ÷ Frequency, and Frequency = GRP ÷ Reach. You need to know one of them to derive the other.

Can GRP exceed 100? Yes. Because of frequency, total GRPs routinely exceed 100 — that simply means the cumulative exposure is greater than reaching every audience member once.