Calculate gross rating points for an advertising campaign.
Please do not make financial decisions based on these results.
What is the GRP Calculator?
Calculate gross rating points for an advertising campaign. To use the GRP Calculator, enter reach, average frequency, target audience size; it returns gross rating points, total impressions, people reached, and shows them instantly as you type.
Where the GRP Calculator fits
Calculate gross rating points for an advertising campaign. The main figure it returns is the Gross rating points, worked out from the values you enter.
It belongs with the other marketing & saas metrics tools. If you are comparing options or checking a result from another angle, try the Churn Rate Calculator, Conversion Rate Calculator or the CPM Calculator.
How to use the GRP Calculator
- Fill in the fields. You will need Reach (% of target audience), Average frequency, Target audience size. Use real figures from your own records where you can. Fields marked optional can stay at zero.
- Read the result. The highlighted box gives the Gross rating points, and the cards below show Total impressions, People reached. Tables and charts break it down further.
- Test other scenarios. Results update as you type. Change one value at a time to see what drives the answer, and press Reset to go back to the defaults.
Formula and how it works
Example with real numbers
Here is the GRP Calculator using the default values shown in the calculator above:
Inputs
| Reach (% of target audience) | 40 |
|---|---|
| Average frequency | 3.5 |
| Target audience size | 2,500,000 |
Results
| Gross rating points | 140 |
|---|---|
| Total impressions | 3,500,000 |
| People reached | 1,000,000 |
With these inputs the calculator returns Gross rating points: 140. Change any value in the calculator to see how the result moves.
What if you change one input?
Sensitivity check: raising Reach (% of target audience) from 40 to 48 (about 20% higher) and leaving everything else as in the example above changes the results like this:
| Result | Example | After the change | Change |
|---|---|---|---|
| Gross rating points | 140 | 168 | +20% |
| Total impressions | 3,500,000 | 4,200,000 | +20% |
| People reached | 1,000,000 | 1,200,000 | +20% |
The input that moves the result most is the one to check twice. Change it in the calculator above to test your own case.
What the results tell you
The results panel of the GRP Calculator reports Gross rating points, total impressions and people reached. Compare these figures while changing one input at a time, and use the related calculators below to look at the same situation from another angle.
Method and limits. This calculator applies the formula in the section above to your inputs, in your browser; nothing you enter is stored on our servers. The result is only as accurate as the numbers you enter and the formula shown above. It is for information, not financial, tax or legal advice.
Frequently asked questions
What does GRP measure?
It sums the rating of every ad insertion to show total campaign weight.
How do I improve ROAS?
Raise conversion rate or order value, tighten targeting, and cut spend on campaigns that fall below your break-even ROAS.
Which marketing metrics matter most?
Customer acquisition cost, lifetime value, conversion rate, churn and return on ad spend show whether growth is profitable.
Are the results guaranteed?
No. Results depend entirely on the numbers you enter and the formulas shown on this page. Please do not make financial decisions based on them alone; confirm important figures with a licensed professional.
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