Free reach calculator. Turn impressions and frequency into unique reach, get your reach rate vs followers, and estimate share amplification.
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Reach is the number of unique people who saw your content — not the total number of views. This calculator converts your impressions and average frequency into unique reach, shows what percentage of your followers that reach represents, and estimates how far shares can amplify it. Because reach counts unique viewers, it is always less than or equal to impressions.
Social media reach is the number of unique users who saw your content at least once. Impressions, by contrast, count every view — the same person seeing a post three times is one reach but three impressions. Frequency is how many times, on average, each unique person saw the content, so Reach = Impressions ÷ Frequency. Since frequency is at least 1, reach can never exceed impressions. The reach, impressions, and frequency definitions follow standard digital ad-measurement conventions from the Media Rating Council (MRC) and IAB, so the figures line up with what ad platforms report.
Reach Formula
Turn a raw impressions number into the count of unique people who actually saw the post.
Track how often the same audience is being hit so you can avoid ad fatigue.
Show stakeholders what share of your followers a campaign reached, on a consistent basis.
Get a discounted, honest estimate of the extra audience shares could add — not an inflated number.
Impressions double-count the same viewer. Reach tells you how many distinct people your content actually touched.
A high frequency with flat reach means you are showing the same content to the same people repeatedly — a signal to refresh creative or widen targeting.
Reach rate (reach ÷ followers) is the honest way to compare how far posts spread, and it can exceed 100% when content travels beyond your audience.
Reach is the number of unique people who saw your content; impressions is the total number of times it was displayed, including repeat views by the same person. Reach is always less than or equal to impressions.
Frequency is the average number of times each unique person saw your content, calculated as impressions ÷ reach. Most platform and ad dashboards (Meta Ads Manager, LinkedIn, TikTok) report it directly. If you only know reach, divide impressions by reach to get it; typical values are 1.5–4.
Yes — reach rate (reach ÷ followers) can legitimately exceed 100% when your content is seen by more unique people than you have followers, for example through the explore page, shares, or hashtags. This is normal for reach. What is NOT valid is treating impressions ÷ followers as a reach rate, because impressions count repeat views and overstate how many people you reached.
It is a rough estimate, not guaranteed reach. We multiply shares by the average followers per sharer, then apply a 70% overlap discount because a sharer's audience largely overlaps people who already saw the post. Treat it as an upper-bound signal of viral potential, not a measured metric.