Ad Frequency Calculator
(Impressions, Reach & Frequency)
Calculate ad frequency from impressions and reach, or find the reach or impressions a target frequency needs.
Step 1 — Calculation Goal
Step 2 — Core Metrics
Total number of times your ads were displayed
Number of individual unique people who saw your ad
Ad Frequency Result
💡 Ad Frequency Formulas
This ad frequency calculator works out how many times, on average, each person has seen your ad. Enter the impressions and reach from your ad platform and it divides one by the other. It can also run the sum the other way, to find the reach a number of impressions will give at a target frequency, or the impressions needed to show an ad a set number of times to an audience.
The Ad Frequency Formula
Impressions are the number of times the ad was shown. Reach is the number of different people it was shown to. Rearranging the same formula gives the other two.
| To find | Formula | Example |
|---|---|---|
| Frequency | Impressions ÷ Reach | 120,000 ÷ 40,000 = 3 |
| Reach | Impressions ÷ Frequency | 120,000 ÷ 3 = 40,000 |
| Impressions | Reach × Frequency | 25,000 × 2 = 50,000 |
The example buttons in the calculator fill in sample figures like these. They are illustrations, not recommended frequencies.
Where to Find Impressions and Reach
Meta Ads Manager reports impressions, reach and frequency as columns for each campaign, ad set and ad. Google Ads reports impressions everywhere and gives reach and frequency figures for Display and Video campaigns. Reach is an estimate on every platform, because the same person can use several devices and browsers. Always take impressions and reach for the same campaign and the same dates, or the result means nothing.
Reading the Result
Frequency matters because it grows on its own. A fixed audience and a steady budget mean the same people are shown the ad again and again, and the figure climbs week by week. Three signs taken together show that it has gone too far:
- frequency is rising;
- click-through rate is falling;
- cost per click or per result is rising at the same budget.
Track them with the CTR Calculator and the CPM Calculator. A small retargeting audience reaches a high frequency quickly, and a broad audience may never get there.
Cost per Person Reached
Enter the ad spend and the calculator adds two figures. CPM is the cost of a thousand impressions: $600 for 120,000 impressions is $5.00. Cost per person reached divides the same spend by reach: $600 for 40,000 people is $0.015 each. As frequency rises, CPM can stay level while the cost of reaching each new person goes up, which is why both are worth watching.
How to Use the Ad Frequency Calculator
- Choose what to solve for: Pick ad frequency, unique reach or required impressions.
- Enter the two known figures: For frequency, enter impressions and reach from your ad platform's report. The result appears as you type.
- Add the campaign length and spend: Optional. Days give the daily averages, and ad spend gives CPM and the cost per person reached.
Frequently Asked Questions
How do you calculate ad frequency?
Divide impressions by reach. If an ad was shown 120,000 times to 40,000 different people, the frequency is 120,000 ÷ 40,000 = 3. On average, each person saw the ad three times.
What is the difference between reach and impressions?
Reach counts people and impressions count showings. One person who sees an ad five times adds 1 to reach and 5 to impressions. Impressions are therefore always equal to or greater than reach, and frequency is never below 1.
What is a good ad frequency?
There is no single figure. It depends on the size of the audience, how long the campaign runs and what the ad asks people to do. A frequency of 3 over one week is a very different thing from 3 over three months. The practical test is your own data: when frequency keeps rising while click-through rate falls and cost per result climbs, the audience has seen the ad enough.
Why is frequency an average?
Because exposure is uneven. A frequency of 3 does not mean everyone saw the ad three times. Some people saw it once and a smaller group saw it ten times or more. Platforms that offer a frequency cap let you limit how often one person is shown the ad.
Can I add up reach from several ad sets or days?
No. The same person can be reached by two ad sets, or on two different days, and would be counted twice. Use the reach figure the platform reports for the whole campaign and date range, and divide the total impressions for the same range by it.
What is ad fatigue?
The fall in response that comes when the same people see the same ad too many times. It shows as a declining click-through rate and a rising cost per result at a steady budget. The usual remedies are new creative, a wider audience or a frequency cap.
All figures on this page are worked from the formulas shown, not from industry data.