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Metrics

Impressions

Impressions count the total times a post was displayed, including repeat views, so a high impressions-to-reach ratio shows the algorithm reshowing it.

What are impressions?

Every time your post loads on someone's screen, that's an impression. A single user scrolling past your tweet three times in a day generates three impressions. The same user seeing the post in their feed and again in their notifications: two impressions.

It's the most generous count of "views" a network reports.

Impressions vs reach

  • Reach = unique people (1,000 followers saw the post → 1,000 reach)
  • Impressions = total views (those 1,000 people saw it twice on average → 2,000 impressions)

The ratio between them tells you how often each viewer comes back. A high impressions-to-reach ratio (3x+) usually means your post is showing in feeds repeatedly, common for paid posts and posts that the algorithm keeps reshowing to engaged users.

When to lean on impressions

  • Frequency-driven goals: if the message needs repetition (a launch, an event date), impressions matter more than reach
  • Paid campaigns: most ad platforms bill on impressions (CPM = cost per 1,000 impressions)
  • Comparing posts within the same audience: when reach is roughly constant, impression delta tells you which posts the algorithm decided to surface more

For organic engagement-rate analysis though, default to reach as the denominator. Impressions overcount and make the rate look weaker than it is.

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