Full definition
Reach is how many distinct people saw the post. It's different from Impressions — if the same person sees a post 3 times, that's 3 impressions but only 1 reach. Reach is a better measure of true exposure.
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Why it matters
Reach counts unique people, which makes it the right number for "how many people did I actually get to". In group posting that matters enormously, because the same people belong to several groups.
🧮 A worked example
You posted to 12 groups with 60,000 members between them. Actual reach was 8,400 — because membership overlaps heavily and most members were not online at that hour.
⚠️ The common mistake
Adding up every group’s member count and calling it potential reach. That total is almost always inflated several times over by overlapping membership.
Full guide on the blog
Want to go deeper on this term?
The Facebook Algorithm in 2026 — What Changed and How to Win
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Read the full guide🔗 Related terms
More terms in Analytics & Metrics
Impressions
How many times your post appeared on someone's screen
Engagement Rate
The percentage of viewers who commented, liked, or shared
Conversion Rate
The percentage of visitors who complete a desired action
LTV (Lifetime Value)
How much an average customer is worth over the life of the relationship
CAC (Customer Acquisition Cost)
How much it costs to win a new customer
Churn Rate
The percentage of customers who leave each month
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