If you are running a brand with any meaningful offline spend, and you cannot explain what a GRP is to your CFO in 60 seconds, you are flying blind with someone else's money. Television, radio, out-of-home, and print still account for over 50% of total ad spend in many mature markets. Procter & Gamble spent $2.8 billion on TV advertising in 2022 alone. The executives running those budgets are not guessing. They are using a measurement system built over 60 years that tells them exactly how many people saw their message, how often, and with what intensity. This lesson gives you that system.
GRP stands for Gross Rating Points. A rating point equals 1% of the total population in a defined market. So if you run a TV ad in the United States and it reaches 10% of the total population, that single airing earns you 10 GRPs. If you run it again and it reaches another 10%, you have 20 GRPs total, even if some of the same people saw it twice. GRP does not care about overlap. It is a gross measure, meaning duplicated exposures count.
TRP stands for Target Rating Points. Same math, different denominator. Instead of measuring against the total population, you measure against your specific target audience. If you are Pampers and you are targeting mothers aged 25 to 44, your TRP calculation uses only that group as the base. A campaign that reaches 30% of American mothers three times delivers 90 TRPs. This is the number that actually matters for brand planning because it tells you how hard you hit your actual buyer.
The formula is straightforward: GRP or TRP equals ReachReachThe number of unique people exposed to your message in a given period. Unlike impressions, reach counts each person once, no matter how often they see it. multiplied by Frequency. is the percentage of your target audience exposed at least once. Frequency is the average number of times each person in that reached audience saw the ad. A campaign with 60% and an average frequency of 5 delivers 300 TRPs. These three numbers, , frequency, and rating points, form the backbone of every offline media plan worth taking seriously.
Reach vs. Frequency Trade-off
Every media dollar you spend pushes you further along a curve. Early spend buys new eyeballs fast. Later spend buys more exposures to people who already saw you. CocaCocaCustomer Acquisition Cost: total sales and marketing spend divided by the number of new customers acquired over the same period.Voir la définition complète →-Cola's media agency, MediaCom, documented in a 2019 effectiveness study that for brand awarenessbrand awarenessThe degree to which your target audience recognises or recalls your brand, either prompted or unprompted. It measures how present your brand is in people's minds.Voir la définition complète → campaigns, reaching 70% of a target at low frequency consistently outperformed reaching 40% at high frequency. But for direct response, the opposite was true. Knowing where your campaign sits on that curve determines how you allocate budget across placements.
CPP: Cost Per Point
CPP is what you pay for one rating point in a given market. In the New York DMA (Designated Market Area, meaning the geographic region where TV stations broadcast), a primetime CPP on a major network can exceed $40,000. In the Tulsa DMA, that same point costs under $800. CPP lets you compare efficiency across markets and dayparts without getting confused by raw audience size. When a media buyer tells you they negotiated a 15% reduction in CPP on your Q4 scatter buy, that is a concrete, measurable win.
Effective Frequency
Not all exposures are equal. The concept of effective frequency asks: how many times does someone need to see your ad before it actually changes their behavior or belief? Herbert Krugman's foundational 1972 research at General Electric proposed that three exposures were sufficient: one to create awareness, one to create relevance, one to create decision. Modern research, including work by Ehrenberg-Bass Institute's Byron Sharp, challenges fixed thresholds, but the principle holds: there is a floor below which your spend creates no impact. Running one spot in one market one time is not a campaign. It is a donation to the broadcaster.
Offline Attribution: Share of Voice and Sales Correlation
Share of VoiceShare of VoiceYour brand's share of total advertising or conversation volume in your category, measured against competitors over a defined period.Voir la définition complète →, or SOVSOVYour brand's share of total advertising or conversation volume in your category, measured against competitors over a defined period.Voir la définition complète →, measures your brand's GRP spending as a percentage of total category GRP spending. Les Binet and Peter Field's analysis of the IPA Effectiveness Awards database, covering 996 case studies over 30 years, showed that brands whose SOVSOVYour brand's share of total advertising or conversation volume in your category, measured against competitors over a defined period.Voir la définition complète → exceeded their market sharemarket shareThe percentage of total industry sales your company captures in a given period. It measures competitive position relative to rivals in a defined market.Voir la définition complète →, what they called Excess Share of VoiceShare of VoiceYour brand's share of total advertising or conversation volume in your category, measured against competitors over a defined period.Voir la définition complète → or ESOV, grew market sharemarket shareThe percentage of total industry sales your company captures in a given period. It measures competitive position relative to rivals in a defined market.Voir la définition complète → at a predictable rate of approximately 0.5 percentage points per 10 points of ESOV. This is one of the most reliable correlations in all of marketing effectiveness research.
Airbnb's Offline Pivot in 2022
After pulling back almost entirely from performance marketing in 2020, Airbnb CMO Hiroki Asai oversaw a decisive shift toward brand building using offline channels. In their Q2 2022 earnings call, CEO Brian Chesky reported that Airbnb achieved the same revenue as Q2 2019 while spending 50% less on performance marketing. Their TV and out-of-home campaigns, measured using TRPs tracked against a 25 to 49 adult demographic, drove unprompted brand awarenessbrand awarenessThe degree to which your target audience recognises or recalls your brand, either prompted or unprompted. It measures how present your brand is in people's minds.Voir la définition complète → to record levels without proportional spend increases.
McDonald's Local Market GRP Strategy
McDonald's uses a co-op advertising model where national campaigns deliver base GRPs through network TV, and local franchisee groups layer on local market GRPs through spot TV buys. In competitive markets like Chicago or Los Angeles, local operators may add 200 to 400 TRPs per quarter on top of national delivery. Their internal data, referenced in franchisee training materials, shows that markets hitting above 800 quarterly TRPs against adults 18 to 49 consistently outperform markets below 500 TRPs on same-store sales growth by 3 to 5 percentage points.
Geico's Frequency Doctrine
Geico spent approximately $1.7 billion on advertising in 2021, making them one of the heaviest TV advertisers in the United States. Their strategy, largely architected by former CMO Ted Ward, was built around extreme frequency rather than broad reachreachThe number of unique people exposed to your message in a given period. Unlike impressions, reach counts each person once, no matter how often they see it.Voir la définition complète →. They consistently targeted high weekly frequency levels, often 7 to 10 exposures per week against their core demographic, on the thesis that insurance is a low-interest category where repeated exposure drives the moment-of-need recall. Their market sharemarket shareThe percentage of total industry sales your company captures in a given period. It measures competitive position relative to rivals in a defined market.Voir la définition complète → grew from under 3% in 1996 to over 14% by 2022, a direct outcome of a metrics-driven frequency strategy sustained over 25 years.
Confusing GRP volume with effectiveness. A plan delivering 1,200 GRPs over 12 weeks sounds impressive until you realize it is spread across 50 markets at 24 GRPs each, which is below any credible effective frequency threshold in any single market. Aggregate GRP numbers hide thin local delivery. Always analyze by market.
Ignoring the reach plateau. Once you have reached 70 to 75% of your target audience, additional reachreachThe number of unique people exposed to your message in a given period. Unlike impressions, reach counts each person once, no matter how often they see it.Voir la définition complète → becomes exponentially expensive because you are chasing the hardest-to-reachreachThe number of unique people exposed to your message in a given period. Unlike impressions, reach counts each person once, no matter how often they see it.Voir la définition complète → light TV viewers. Many brands blow 20 to 30% of their TV budget buying the last 10 points of reachreachThe number of unique people exposed to your message in a given period. Unlike impressions, reach counts each person once, no matter how often they see it.Voir la définition complète →. If your goal is frequency-driven impact, that money buys far more TRPs by targeting already-reached viewers on additional placements.
Treating offline and online metrics as separate universes. Your television TRPs generate search lift, site traffic spikes, and social conversation within 24 to 48 hours of airing. If your analytics team is not correlating GRP delivery dates with digital performance data, you are misattributing offline-driven conversions to organic or paid search, which systematically undervalues your TV investment and leads to budget cuts that hurt total performance.
The foundational IPA report by Les Binet and Peter Field quantifying the relationship between Share of Voice, brand investment, and market share growth across 996 real campaigns.
Nielsen's publicly available audience measurement reports that provide real GRP benchmarks, reach and frequency data, and CPP trends across US television markets.