What is the difference?
Post Impressions
Post Reach
Post Impressions is the total number of times a post appeared in user timelines or feeds. It measures visibility only — it does not confirm that anyone read, clicked, or engaged with the content. Post Impressions is a total count, not a unique count, so the same user seeing a post multiple times generates multiple impressions. It is important to distinguish Post Impressions from Post Reach, which counts unique users only.
Post Reach is the count of unique people who saw your post at least once across a given time period. Unlike impressions, which tally every view including repeats, Post Reach measures how many distinct individuals your content actually reached. Marketers use it to evaluate content distribution, track audience exposure, and assess whether organic or paid amplification is expanding reach to new people.
Company ABC has 100 followers on Facebook. The company shares a post that appears in each follower's feed twice in one week. The metrics for that week are:
Impressions: 200 Reach: 100
Impressions count the total number of times the post was visible, while reach counts the number of unique users who saw it, regardless of how many times it appeared in each person's feed.
Formula: Post Reach = Count of unique impressions
A social media manager at a growing e-commerce brand publishes a product announcement. Over one week, the post generates 4,200 total impressions. Of those, 3,100 come from unique accounts.
Total impressions: 4,200
Post Reach: 3,100
The remaining 1,100 impressions came from people who saw the post more than once. The manager now knows that 3,100 distinct people encountered the announcement — a baseline for comparing future posts and tracking audience exposure over time.
Date created: Oct 12, 2022
Latest update: May 27, 2026
Date created: Oct 12, 2022
Latest update: May 27, 2026
