If you are spending seven figures on television, radio, or out-of-home advertising and you cannot explain the difference between a GRP and a TRP to your CFO, you are flying blind with someone else's money. Offline media still accounts for roughly 60 percent of total global ad spend according to GroupM's 2023 forecast, and the CMOs who consistently win budget battles are the ones who can translate impressionsimpressionsThe total number of times an ad or piece of content is displayed, regardless of clicks. Each display counts as one impression, even to the same person.Voir la définition complète → into business outcomes using a disciplined measurement framework. This lesson gives you that framework.
CORE CONCEPT: WHAT GRP AND TRP ACTUALLY MEAN
GRP stands for Gross Rating Point. One GRP equals one percent of the total population in a defined market reached once. It is a raw, unduplicated-exposure-free measure of total advertising weight. You buy 200 GRPs in the Chicago DMA (Designated Market Area), you have delivered the equivalent of 200 percent of Chicago's population in total exposures, which could mean 100 percent of people saw it twice, or 50 percent saw it four times. GRPs do not care about who saw the ad.
TRP stands for Target Rating Point. Same math, but the denominator changes from total population to your specific target audience. If your target is women aged 25 to 54 and you buy 200 TRPs, you have delivered 200 percent of that specific group in exposures. This is the number that should matter to most brand CMOs, because you are paying to buyers, not everyone with a pulse.
The formula that ties everything together is: GRP = 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 → x Frequency. 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 → is the percentage of your target audience exposed at least once. Frequency is the average number of times they were exposed. If you reached 40 percent of your target audience and each person saw the ad an average of 5 times, you generated 200 TRPs. Simple arithmetic, profound strategic implications.
KEY SUB-CONCEPT 1: 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 → VS. FREQUENCY TRADE-OFFS
Every media plan forces a choice. With a fixed budget, you can maximize 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 → (more people see it once) or maximize frequency (fewer people see it many times). Procter and Gamble's media team, historically led by figures like Marc Pritchard, has published extensively on the concept of effective frequency, arguing that a consumer needs to see a message at least three times before it influences purchase intent. This is the basis for the so-called 3-plus 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 → metric: what percentage of your target saw your ad three or more times. During P&G's $100 million digital pullback in 2017, Pritchard explicitly cited poor 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 → and wasted frequency as the reason, then redirected spend toward channels where TRP delivery could be verified.
KEY SUB-CONCEPT 2: CPP AND CPMCPMCost Per Mille: the cost to deliver 1,000 ad impressions. A pricing and benchmarking metric for awareness campaigns where reach matters more than clicks.Voir la définition complète → AS BUYING CURRENCIES
CPP means Cost Per Point. It is the cost to deliver one rating point to your target. If a 30-second spot on a primetime NBC show costs $400,000 and it delivers a 4.0 rating among adults 18 to 49, your CPP is $100,000. CPMCPMCost Per Mille: the cost to deliver 1,000 ad impressions. A pricing and benchmarking metric for awareness campaigns where reach matters more than clicks.Voir la définition complète → means Cost Per Thousand impressionsCost Per Thousand impressionsCost Per Mille: the cost to deliver 1,000 ad impressions. A pricing and benchmarking metric for awareness campaigns where reach matters more than clicks.Voir la définition complète →, a metric borrowed from print that is now universal across all media. The relationship is direct: lower CPP means more efficient TRP delivery for your budget. Media buyers at agencies like Dentsu or Publicis negotiate CPP levels by daypart, by network, and by season. A CMO who does not know their category's benchmark CPP is at the mercy of their agency's incentives.
KEY SUB-CONCEPT 3: HOW NIELSEN AND COMSCORE MEASURE THIS OFFLINE
Nielsen's national television ratings are still the industry currency for TV in the United States. Nielsen uses a panel of approximately 40,000 households with people meters that track who in the household is watching and when. The rating it produces is the basis for every TRP calculation in a national TV buy. Nielsen ONE, launched in 2022, is Nielsen's attempt to unify measurement across linear TV, streaming, and digital into a single deduplicated 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 → number, which matters enormously as audiences fragment. Comscore competes in local market measurement and is particularly strong in the out-of-home and digital video categories.
KEY SUB-CONCEPT 4: 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 → AND SHARE OF MARKETSHARE OF MARKETServiceable Obtainable Market: the share of your SAM you can realistically capture given current resources, channels, and competitive position.Voir la définition complète →
Les Binet and Peter Field's analysis of the IPA Databank, covering 1,400 case studies over three decades, produced one of the most cited findings in marketing science: brands that maintain a 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 → (SOVSOVYour brand's share of total advertising or conversation volume in your category, measured against competitors over a defined period.Voir la définition complète →) above their Share of MarketShare of MarketServiceable Obtainable Market: the share of your SAM you can realistically capture given current resources, channels, and competitive position.Voir la définition complète → (SOMSOMServiceable Obtainable Market: the share of your SAM you can realistically capture given current resources, channels, and competitive position.Voir la définition complète →) tend to grow, while brands below that threshold tend to shrink. SOVSOVYour brand's share of total advertising or conversation volume in your category, measured against competitors over a defined period.Voir la définition complète → is simply your brand's GRPs as a percentage of total category GRPs in a period. If the beer category delivers 10,000 total GRPs in a quarter and Budweiser delivers 2,500, Budweiser's SOVSOVYour brand's share of total advertising or conversation volume in your category, measured against competitors over a defined period.Voir la définition complète → is 25 percent. If Budweiser holds 20 percent 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 →, they are running an excess SOVSOVYour brand's share of total advertising or conversation volume in your category, measured against competitors over a defined period.Voir la définition complète → of 5 points, which Binet and Field's data suggests correlates with 0.5 percent 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 → gain per year on average.
REAL-WORLD CASES
Case 1: McDonald's SOVSOVYour brand's share of total advertising or conversation volume in your category, measured against competitors over a defined period.Voir la définition complète → discipline. During the 2008 financial crisis, most fast-food chains cut TV spend. McDonald's held and in some markets increased their GRP weight. By 2010 their US 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 → in the QSR category had grown from 19.1 percent to 20.6 percent, a gain worth billions in annual revenue. Their agency DDB tracked TRP delivery weekly against competitive spend estimates from Nielsen Ad Intel.
Case 2: Geico's frequency model. Geico spends approximately $1.5 billion annually on US media, making them consistently one of the top 5 advertisers by volume. Their strategy is built on extreme frequency rather than 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 → optimization. Internal analysis cited by former Geico CMO Ted Ward showed that moving from 3 exposures to 7 exposures per month for their core 25 to 44 demographic produced measurable lift in unaided awareness and quote requests. They run high-TRP schedules on cable news specifically because CPP on cable is 60 to 70 percent lower than broadcast for the same demographic.
Case 3: Old Spice's 2010 campaign. Wieden + Kennedy built a media plan that combined television GRP weight with viral amplification. The TV buy delivered approximately 1,400 GRPs in the first two weeks, targeted at men 18 to 34. That 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 → foundation drove YouTube views past 50 million in the first month. Sales of Old Spice body wash increased 125 percent year over year within six months. The lesson: offline GRP delivery creates the awareness base that makes digital amplification work efficiently.
CMO ACTION ITEMS
COMMON MISTAKES THAT KILL RESULTS
Mistake 1: Optimizing for GRPs instead of TRPs. A media plan that delivers 500 GRPs to total adults when your product is only relevant to adults 35 to 64 is wasting 40 to 50 percent of its budget on irrelevant eyeballs. Always tie the rating point currency to the actual buyer definition. This sounds basic and it is still the most common error in mid-market brand media plans.
Mistake 2: Treating frequency as automatically good. There is a wear-out effect that Nielsen has documented across thousands of campaigns. After approximately 10 to 12 exposures in a four-week period, incremental exposures produce negative attitudinal effects for most brand categories. Running 400 TRPs concentrated in two weeks against a small target audience can actively damage brand perception. Binet and Field's data shows diminishing returns on frequency begin well before most media plans acknowledge them.
Mistake 3: Measuring offline in isolation. The offline GRP schedule creates search lift, social conversation, and direct traffic spikes that show up in digital analytics. Brands that measure TV in a silo consistently undervalue it. Use a media mix model or at minimum track branded search volume against GRP delivery windows. Google and Meta both publish studies showing that TV-driven search lift is measurable within 24 hours of a high-GRP flight, which is exactly the kind of cross-channel evidence that justifies offline budget to a skeptical CFO.
The foundational empirical study on Share of Voice, Share of Market, and the relationship between GRP weight and long-term brand growth, based on 1,400 real campaigns.
Nielsen's official documentation on their cross-media measurement framework, explaining how TRP delivery is now being unified across linear TV, streaming, and digital for deduplicated reach reporting.