Reach & Frequency Calculator
Reach and frequency describe how widely and how often a campaign exposes its audience. Reach is the number of unique people who saw the ad at least once, and frequency is the average number of times each of them saw it. Together they are the foundation of brand campaign planning, because total impressions alone cannot tell you whether you reached many people once or few people many times. This free reach and frequency calculator solves for either value, and it requires no email.
Enter your numbers to see results.
Enter impressions and reach to solve for average frequency, or impressions and frequency to solve for the people reached. Add an optional audience size and the calculator also returns your reach as a percentage of that audience, which is what feeds rating-point and saturation planning.
Use it to plan a brand flight, diagnose whether a campaign is over-exposing a small group, or convert raw impression totals into the reach and frequency story behind them.
How it works
The three values are linked: impressions equal reach multiplied by average frequency. So average frequency equals impressions divided by reach, and reach equals impressions divided by frequency.
When you know the size of your target audience, reach percentage equals people reached divided by audience size, multiplied by 100. That percentage is what connects reach and frequency to gross rating points and saturation planning.
Worked example
Suppose a campaign serves 900,000 impressions to 300,000 unique people. Average frequency is 900,000 divided by 300,000, or 3.0, meaning each person saw the ad three times on average.
If the target audience is 1,000,000 people, reach is 300,000 divided by 1,000,000, multiplied by 100, or 30%. The campaign reached 30% of the audience at an average frequency of three.
What is a good frequency?
A good frequency is high enough for the message to register but low enough to avoid waste and fatigue. The long-standing effective frequency heuristic is roughly 3 or more exposures within a purchase cycle, on the logic that the first exposure builds awareness, the second adds recognition, and the third prompts action. It is a starting point, not a law: simple, familiar messages need fewer exposures, while complex or new propositions need more.
Too much frequency is its own problem. When the same people see an ad far more than they need to, response decays, cost per outcome climbs, and the brand risks irritation rather than recall. Frequency capping exists to prevent this by limiting how often any one person is served the ad, which redirects impressions toward incremental reach instead of over-exposing your warmest audience.
Do not confuse reach with impressions. Impressions count every exposure, while reach counts unique people, so a campaign can rack up huge impression totals while reaching a small audience many times over. Plan against reach and effective frequency, then use QRY's monthly paid media benchmarks to judge whether your delivery and the CPMs behind it are efficient for the channel.
See QRY's monthly paid media benchmarks to compare your numbers against the portfolio.
Frequently asked questions
What is a good frequency?
A good frequency is typically around 3 or more exposures within a purchase cycle, following the effective frequency heuristic that three exposures are enough to drive action. Simple, familiar messages need fewer; complex or unfamiliar ones need more. Beyond the effective range, additional frequency wastes budget and risks fatigue.
How do you calculate reach and frequency?
Impressions equal reach multiplied by average frequency, so average frequency equals impressions divided by reach, and reach equals impressions divided by frequency. For example, 900,000 impressions to 300,000 people is an average frequency of 3.0. Divide reach by audience size for reach as a percentage.
What is the difference between reach and impressions?
Reach counts the number of unique people who saw an ad at least once, while impressions count every exposure, including repeats. A campaign with 900,000 impressions might reach only 300,000 people at a frequency of three. Confusing the two overstates how many people a campaign actually touched.
What is effective frequency?
Effective frequency is the number of exposures needed for a message to drive a response, commonly cited as 3 or more within a purchase cycle. The idea is that awareness builds with the first exposure, recognition with the second, and action with the third. The exact number varies with message complexity and brand familiarity.
Why use frequency capping?
Frequency capping limits how often a single person is served an ad, preventing the response decay, rising cost per outcome, and brand irritation that come from over-exposure. By capping repeats, you redirect impressions toward reaching new people, which usually improves the efficiency of a brand campaign.
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