What Is Reach? — Free Tool
Reach counts the unique accounts that saw a post at least once. How platforms estimate it, why it is not the same as followers, and why reach across channels cannot simply be added up.
The number of unique accounts that saw a post at least once. Reach is always lower than or equal to impressions; the gap between them tells you how often the average viewer saw it.
What it is
Reach is the number of unique accounts that saw a post at least once. Where impressions count deliveries, reach counts people, or more precisely accounts. Seeing a post five times still counts as one unit of reach.
How it is measured
Platforms compute reach by de-duplicating impressions to unique viewers. You do not calculate it, but you do derive from it: average frequency is impressions divided by reach, and reach rate is reach divided by follower count times 100, which tells you what share of your own audience a post actually got to.
Commonly misunderstood
Reach is not followers and it is not an exact count. Most platforms estimate it with probabilistic de-duplication across devices, so a three percent week-on-week move is noise, not a trend. The bigger reporting error is summing reach across channels: the same human can be one account on Instagram, one on LinkedIn and one on X, and adding those three numbers produces an audience that does not exist. It is also worth splitting organic, paid and viral reach, because Meta reports them separately and a page whose total reach is holding steady on rising ad spend is losing organic ground.
When it matters
Reach is the right headline number for awareness campaigns and for judging whether a channel is still delivering distribution to your existing audience. Pair it with frequency before deciding whether to raise budget or refresh creative.
Related terms
Features
- Plain definition of reach and how it differs from impressions and followers
- Why reach is a modelled estimate rather than an exact count on most platforms
- Organic, paid and viral reach separated, and why the split matters in a report
- The de-duplication problem: why reach across channels cannot be summed
- Links to impressions, frequency and organic reach for the full picture
Frequently asked questions
Is reach the same as followers?
No. Followers are people who subscribed to your account. Reach is how many unique accounts actually saw a given post, which on most platforms is a fraction of your follower count plus non-followers the algorithm surfaced it to.
Can reach be higher than my follower count?
Yes, and routinely is on TikTok, Reels and Shorts, where distribution is driven by interest matching rather than subscription. On LinkedIn and Facebook pages it is less common without paid support.
Is reach an exact number?
Rarely. Platforms de-duplicate across devices and sessions using probabilistic modelling, so reach is an estimate with a margin. Treat small week-on-week movements as noise.
Can I add reach across Instagram, LinkedIn and X?
Not honestly. The same person may follow you on all three, and no platform shares identity with another, so summing gives a number larger than the real audience. Report reach per channel.
Why did my reach drop with no change in posting?
Usually a ranking change, a shift in what your audience is engaging with, or seasonality. Check whether impressions fell by the same proportion: if impressions fell more than reach, frequency dropped, which points at distribution rather than content.
