Impressions vs reach: what is the difference in advertising?
The difference between impressions and reach, how frequency connects them, and why advertisers increasingly plan campaigns by reach.
Written by Samhub with the help of AI·Updated 13 Oct 2026·3 min readImpressions count how many times an ad was shown. Reach counts how many different people saw it at least once. Frequency is the average number of times each person saw it.
How they connect
Frequency = impressions ÷ reach
Example: 1,200,000 ÷ 300,000 = 4 views per person
Illustrative numbers.
Impressions vs reach
| Impressions | Reach | |
|---|---|---|
| Counts | Ads shown | Unique people |
| Answers | How much was delivered? | How many people did we reach? |
| Priced by | CPM | Cost per reached person |
16 pages for publishers, with a checklist for data, programmatic and direct sales.
Why reach needs data
To count people instead of impressions, you need to recognize readers across visits and devices. Publishers who can plan and report reach in a target audience give advertisers the answer they ask for first: how many of the right people saw it.
More ad sales with data at Stampen Media, using Samhub.
Frequently asked questions
Yes, always, unless every person saw the ad only once.
It depends on the goal. Many brand campaigns aim for a few views per person and cap frequency to avoid waste.
A limit on how many times one person sees the same ad in a period.
By counting unique readers or devices, which needs consistent IDs across visits.
Related terms
A limit on how often one person sees the same ad.
The price of 1,000 ad impressions.
Choosing channels, audiences and budget for a campaign.
The share of your audience you can recognize and target.
One campaign across several media.
Your share of all ads in a market or placement.
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