Calculate Cost Per Rating Point (CPRP), total advertising campaign cost, or gross rating points from the other two values entered below.
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Cost Per Rating Point (CPRP) Formula
The cost per rating point formula measures how much you pay for each gross rating point in an advertising campaign.
- CPRP = cost per rating point, in dollars per rating point
- TC = total advertising campaign cost, in dollars
- GRP = gross rating points
The calculator can also rearrange the same formula to solve for the other two values.
- To calculate CPRP: enter total campaign cost and gross rating points. The result shows the cost for one rating point.
- To calculate total campaign cost: enter CPRP and gross rating points. The result shows the implied media cost.
- To calculate gross rating points: enter total campaign cost and CPRP. The result shows how many rating points the campaign bought.
CPRP Result Interpretation
CPRP is mainly useful when comparing media buys that target the same audience and market. A lower CPRP usually means a more efficient buy, but it should be considered along with placement quality, audience fit, timing, and reach goals.
| CPRP result | General meaning | What to check |
|---|---|---|
| Lower than other options | More cost-efficient per rating point | Confirm the audience, daypart, market, and inventory quality are comparable. |
| Similar to other options | Roughly in line with alternatives | Compare reach, frequency, placement, and creative fit. |
| Higher than other options | Less efficient per rating point | Check if the higher cost is justified by premium placement, audience quality, or timing. |
Common CPRP Inputs
| Input | What it represents | Important note |
|---|---|---|
| Total campaign cost | The media spend or campaign cost used in the CPRP calculation | Use the same cost basis when comparing campaigns, such as gross cost or net cost. |
| Gross rating points | The total rating points delivered by the campaign | GRPs can exceed 100 because they combine reach and frequency. |
| Cost per rating point | The cost to buy one rating point | Compare CPRP only across similar markets, audiences, and media types. |
Example
Example 1: Calculate CPRP
You spend $75,000 on a campaign that delivers 150 gross rating points.
The cost per rating point is $500 per RP.
Example 2: Calculate total campaign cost
A media plan has a CPRP of $425 and is expected to deliver 200 gross rating points.
The total campaign cost is $85,000.
FAQ
What is a good CPRP?
A good CPRP depends on the market, audience, media channel, time period, and campaign objective. CPRP is most useful as a comparison metric. If two media buys target the same audience in the same market, the lower CPRP is usually more efficient.
Is CPRP the same as CPM?
No. CPRP measures cost per rating point, while CPM measures cost per thousand impressions. CPRP is commonly used in rating-based media planning, while CPM is based on impression volume.
Can gross rating points be more than 100?
Yes. Gross rating points can be more than 100 because GRP combines reach and frequency. For example, reaching 50% of an audience an average of 3 times equals 150 GRPs.
