Reach, Frequency, and Why They're Tracked Together
Reach answers “how many people did this campaign touch?” Frequency answers “how many times, on average, did each of them see it?” Impressions alone can't distinguish between a campaign that reached a million people once each and one that reached a hundred thousand people ten times each — reach and frequency together make that distinction visible.
Awareness campaigns typically plan around a frequency target rather than impressions alone, since enough repetition is needed for a message to register, but too much starts wasting budget on people who've already seen it.
Frequency Formula
Divide total impressions by reach.
Frequency = Total Impressions ÷ Reach
Worked Example
A campaign generates 900,000 impressions across 300,000 unique people.
Frequency = 900,000 ÷ 300,000 = 3
Rearranged, the formula solves for impressions or reach instead, which is what the other two modes above do:
Total Impressions = Reach × Frequency
Reach = Total Impressions ÷ Frequency
What Affects Frequency?
- Audience size vs. budget — a fixed budget spread across a smaller audience naturally produces a higher frequency.
- Frequency capping — most platforms let you cap how many times a user sees an ad in a given period, directly controlling this number.
- Campaign duration — longer flights accumulate more impressions against the same audience, raising frequency over time.
- Retargeting vs. prospecting — retargeting campaigns intentionally run at a higher frequency than cold-audience prospecting.
Reach & Frequency Calculator FAQ
How is frequency calculated?
Frequency is calculated by dividing total impressions by reach: Frequency = Impressions ÷ Reach. A frequency of 3 means the average person in your reach saw the ad three times.
What's the difference between reach and impressions?
Reach counts unique people who saw an ad at least once. Impressions count every ad view, including repeats from the same person. Reach is always less than or equal to impressions for the same campaign — frequency is the ratio between the two.
What's a good frequency?
It depends on the campaign goal and format — awareness campaigns often target a frequency in the 3-7 range to build recall without wasting budget on diminishing returns, while retargeting campaigns may intentionally run higher. Watch for performance decline at high frequency, a sign of ad fatigue.
How do you calculate reach from impressions and frequency?
Divide impressions by frequency: Reach = Impressions ÷ Frequency. Use the "Reach" mode above to solve this for your own campaign numbers.