Calcylator
Ad Frequency

Ad frequency:
impressions ÷ reach

Find the average number of times each person saw your ad, and learn what a rising frequency can tell you.

Calcylator Editorial Team

Updated · 6 min read

What is ad frequency?

Ad frequency is the average number of times each person saw your ad. It equals impressions divided by reach, so 90,000 impressions across 36,000 people gives a frequency of 2.5.

Impressions count every view. Reach counts the distinct people who saw the ad at least once. Frequency links the two and shows how much repetition sits behind the total.

The ad frequency formula

Ad frequency =frequency = impressions ÷ reach
impressions:
total times the ad was shown
reach:
number of different people who saw it
frequency:
average views per person
The calculator returns frequency to two decimals and needs a reach above zero.

  • Impressions

    90,000

  • Reach

    36,000

  • Divide

    90,000 ÷ 36,000

Frequency

2.5

On average, each person in the reach saw the ad two and a half times.

Chart: frequency for different campaigns

Frequency from impressions and reach
ImpressionsReachFrequency
45,00030,0001.5
100,00080,0001.25
90,00036,0002.5
120,00040,0003.0
300,00060,0005.0

Using frequency to manage a campaign

A low frequency may mean people saw the ad too few times to notice it. A very high frequency can mean the same audience is being shown the ad repeatedly, which can waste budget and annoy viewers.

There is no single right number. It depends on the channel, the offer and the audience size. Watch how frequency moves over the campaign: if it climbs while the click rate falls, consider a wider audience or fresh creative.

A second example and what to watch

A campaign delivers 250,000 impressions to a reach of 100,000 people, so frequency is 2.5. Two weeks later it has 500,000 impressions and a reach of 125,000, so frequency is 4.0. Reach grew by a quarter while impressions doubled, which means existing viewers saw the ad more often rather than new people seeing it.

That pattern is common when the audience is small and the budget is steady. The same budget keeps showing the ad to the same people. You can check it by calculating frequency at the start and at the end of a period.

Frequency also helps you read other results. If the click rate drops while frequency climbs, the audience may be tiring of the ad. If frequency is close to 1 and results are poor, people may have seen the ad only once and not noticed it.

Pair frequency with reach and impressions when you report, so readers can see how each number moves. Use the same date range for every figure.

Common mistakes with ad frequency

  • Mixing the periods. Impressions and reach must cover the same dates and the same campaign.
  • Reading reach as impressions. Reach counts people, not views.
  • Treating the average as what everyone saw. Some people may have seen the ad ten times and others once.
  • Adding up reach across campaigns. People seen in two campaigns would be counted twice.

Common questions

How do you calculate ad frequency?

Divide impressions by reach. If your ad was shown 120,000 times to 40,000 different people, frequency is 120,000 ÷ 40,000 = 3.0. Use the same dates and the same campaign for both numbers.

What is the difference between impressions and reach?

Impressions count every time an ad is shown, including repeat views by the same person. Reach counts the distinct people who saw it at least once. Impressions are always equal to or higher than reach.

What is a good ad frequency?

There is no fixed answer. It depends on the channel, audience and goal. Many advertisers watch for the point where results level off while frequency keeps rising, as that suggests the audience is seeing the ad too often.

Can frequency be less than 1?

No. Each person in the reach saw the ad at least once, so impressions cannot be lower than reach. If your answer is below 1, the numbers are probably swapped or come from different periods or campaigns.

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