What Is Cost Per Rating Point?
Cost Per Rating Point (CPRP) is an advertising metric that measures how much it costs to reach one rating point of a target audience. It is a standard tool in television and radio media buying, giving advertisers a consistent way to compare the efficiency of different campaigns, time slots, and channels.
Because CPRP normalizes spend against audience delivery, it allows media planners to evaluate whether a prime-time television spot delivers better value than a daytime radio flight, even when the absolute costs and audience sizes differ dramatically.
The Formula
[
\text{CPRP} = \frac{\text{Total Campaign Cost}}{\text{Gross Rating Points}}
]
Where:
- Total Campaign Cost is the sum of all advertising expenses for the campaign, including media buying, production, and agency fees, measured in dollars
- Gross Rating Points (GRP) is a measure of total audience exposure. One GRP equals one reach point of the target audience. GRP values can exceed 100 when an audience is exposed to the message multiple times
Calculation Example
An advertiser spends $10,000 on a television campaign that delivers 500 gross rating points:
[
\text{CPRP} = \frac{10{,}000}{500} = 20.00
]
The cost per rating point is $20.00.
Comparing Campaigns
| Campaign | Total Cost | GRP | CPRP |
|---|---|---|---|
| Prime-Time TV | $10,000 | 500 | $20.00 |
| Daytime TV | $4,000 | 350 | $11.43 |
| Drive-Time Radio | $3,000 | 400 | $7.50 |
| Weekend Radio | $1,500 | 250 | $6.00 |
The table shows that weekend radio delivers the lowest CPRP, but the media planner must weigh that against audience quality, reach goals, and campaign objectives before shifting budget.
Why CPRP Matters
CPRP serves several strategic purposes in advertising planning:
- Budget allocation -- It helps media planners distribute budgets across channels and dayparts by identifying where each dollar generates the most audience exposure. Pairing CPRP analysis with cost per impression data gives a more complete view of spending efficiency across both broadcast and digital channels.
- Performance measurement -- Tracking CPRP across campaign flights reveals whether efficiency is improving or declining over time, allowing mid-campaign adjustments.
- Competitive analysis -- Comparing your CPRP against industry benchmarks or competitor estimates helps you gauge whether your media buying is competitive. The CPT cost per thousand metric provides a complementary perspective for digital media comparisons.
- Vendor negotiation -- Armed with CPRP benchmarks, media buyers can negotiate more effectively with broadcasters and networks.
Tips for Optimizing CPRP
- Negotiate bulk rates -- Committing to higher GRP volumes across a campaign period often unlocks lower per-point pricing from broadcasters. Reviewing your cost per click alongside CPRP helps you understand how broadcast and digital efficiency compare.
- Compare channels rigorously -- Calculate CPRP for every channel and daypart under consideration. A channel that appears expensive on a total-cost basis may deliver superior CPRP once GRP delivery is factored in.
- Track CPRP over time -- Market conditions, seasonal demand, and competitive activity all shift CPRP. Monitoring trends across quarters helps you time buys for maximum efficiency.
- Balance cost and quality -- The lowest CPRP is not always the best buy. A higher CPRP on a premium placement may deliver a more engaged, higher-value audience. Cross-reference with cost per placement data to understand the relationship between placement quality and cost efficiency.
- Explore emerging inventory -- New channels, streaming ad placements, and connected TV often offer lower CPRP as broadcasters build audience data and attract early advertisers.
Related Calculators
- Cost Per Impression Calculator
- CPT Cost Per Thousand Calculator
- Cost Per Click Calculator
- Cost Per Placement Calculator
- Cost Per Action Calculator
You might also like: Cost of Sales Calculator, Cost Per Impression Calculator, or Retained Earnings Calculator.