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Reach & Frequency

General

Reach and Frequency

Reach is the number of unique people exposed to an ad campaign; frequency is the average number of times each person saw it — together they describe a campaign's audience coverage and repetition.

Definition

Reach and Frequency are two complementary media-planning metrics that together describe a campaign's audience coverage and message repetition. Reach is the number (or percentage) of unique individuals exposed to a campaign at least once during a given period. Frequency is the average number of times each of those reached individuals saw the ad.

These two metrics are foundational to traditional and digital media planning because they answer two different strategic questions: reach answers "how many people did we get in front of?" while frequency answers "how many times did each of them see the message?" Both matter — a campaign can have identical total impressions but wildly different business outcomes depending on how those impressions are distributed across reach and frequency.

Formula

Frequency = Total Impressions / Reach

GRP (Gross Rating Point) = Reach (%) × Frequency

Where Reach (%) is expressed as a percentage of the total target population, making GRP a single number that captures overall campaign weight regardless of how reach and frequency are individually distributed.

Worked Example

A brand runs a video ad campaign targeting an audience of 1,000,000 people:

Metric Value
Target population 1,000,000
Unique people reached 400,000
Reach (%) 40%
Total impressions served 2,000,000
Frequency 5.0
GRP 200

Frequency = 2,000,000 / 400,000 = 5.0 exposures per person GRP = 40% × 5.0 = 200

This means the campaign reached 40% of the target audience an average of 5 times each, delivering 200 GRPs of total media weight. Use the Reach & Frequency calculator to model different budget scenarios and their resulting reach/frequency mix.

Key Things to Know

  • Reach and frequency trade off against a fixed budget: For a given ad spend, increasing reach (showing the ad to more unique people) typically lowers average frequency, and vice versa — media planners must decide which to prioritize based on campaign objectives.
  • Frequency capping prevents ad fatigue: Most platforms allow advertisers to cap how many times a single user sees an ad within a period, protecting against diminishing returns and negative sentiment from over-exposure.
  • GRP enables comparison across different media plans: Because GRP combines reach and frequency into one number, planners use it to compare the total weight of campaigns that achieve the same result through different reach/frequency combinations.
  • Reach and frequency planning ties directly to CPM budgeting: Since CPM is priced per 1,000 impressions, and impressions = reach × frequency, media planners use CPM alongside reach/frequency targets to forecast total campaign cost.
  • High frequency without high reach can indicate poor targeting: If a campaign has low reach but very high frequency, it may be repeatedly hitting the same narrow audience segment rather than expanding into new pockets of the target population — worth reviewing alongside share of voice within the category.

Related Calculators

Reach & Frequency Calculator →Calculate average ad frequency and reach percentage instantly. Enter total impressions, unique reach, and target audience size for a full media plan breakdown.

Related Terms

CPMCost Per Mille (Cost Per Thousand Impressions)Share of VoiceBrand Share of Total Market Advertising Presence

Frequently Asked Questions

Reach counts unique individuals exposed to a campaign at least once, while impressions count total ad displays including repeat views by the same person. A campaign can generate 1 million impressions from only 200,000 unique people if each person saw the ad an average of 5 times — reach measures breadth, impressions measure volume.
Optimal frequency depends on the campaign goal and creative complexity, but a commonly cited range for brand awareness is 3–7 exposures within a campaign window — enough for message retention without triggering ad fatigue or wear-out. Direct-response campaigns often tolerate higher frequency since each exposure can still drive a conversion action.
GRP (Gross Rating Point) is a media-planning metric calculated as Reach (%) × Frequency, expressing total campaign weight relative to the target population. A campaign reaching 40% of an audience with an average frequency of 5 delivers 200 GRPs — GRPs are used to compare media plans of different reach/frequency mixes on a single scale.
Increasing budget, adding complementary media channels (e.g. combining social and video), and broadening audience targeting all increase reach, though usually at the cost of frequency per person unless budget scales proportionally. Media planners typically model the reach/frequency tradeoff explicitly using the [Reach & Frequency calculator](/reach-frequency-calculator/) before finalizing a plan.
High reach with low frequency (an ad seen once by many people) often fails to build message recall, since most audiences need multiple exposures before a brand message registers and influences behavior. Media planners balance reach and frequency together rather than maximizing either metric alone, since the two work multiplicatively to build campaign impact.