How it works
There is not one algorithm. Instagram has said that each part of the app ranks content in its own way, because people use each part differently. Feed and Stories mostly show accounts you follow. Reels and Explore mostly show accounts you do not. In every case the system does the same basic thing: it gathers candidate posts, predicts how likely you are to interact with each one, and shows the highest-scoring posts first.
Those predictions are built from signals. Instagram has described four broad groups: your own activity, what is known about the post, what is known about the person who posted it, and your history of interacting with that person. The predicted actions differ by surface. For Reels, Instagram has named watching to the end, liking, resharing and going to the audio page as the important ones.
For a creator, the practical meaning is that reach is earned post by post from how viewers respond, not granted by a setting or a posting trick. Nobody outside Instagram knows the exact weights, and they change, so treat any claim of a secret formula with suspicion. The dependable approach is to read Instagram's own statements, then test changes against your own Insights.
A worked example
A simplified picture of what happens when one creator posts two Reels in the same week.
- The first Reel is shown to an initial set of viewers, some of whom do not follow the account.
- Those viewers watch most of it and many send it to friends. These are actions Instagram says it predicts for Reels.
- Because the response is strong, the system expects similar viewers to respond too, and the Reel keeps being recommended.
- Most early viewers skip the second Reel within two seconds, and its reach stops early. Same account, different result.
An illustration, not a real account. Any numbers in it are made up to show the method, and are not benchmarks.
Common mistakes
- Talking about the algorithm as one thing. Feed, Stories, Reels and Explore rank differently.
- Believing hacks about exact posting times, hashtag counts or caption tricks. They are guesses unless Instagram has said so.
- Blaming a shadowban for an ordinary drop. Check Account Status and your Insights first.
Questions people ask
How does the Instagram algorithm work?
It predicts how likely you are to interact with each post, using signals about you, the post and the poster, and ranks posts by those predictions. Each surface, such as Feed or Reels, does this with its own signals.
Can I beat the Instagram algorithm?
There is nothing to trick. As a viewer you can shape what you are shown, for example by marking posts Not Interested. As a creator you improve reach by making posts that people watch and share.
Does posting time matter?
Timing can help a post meet its first viewers, and its effect is smaller than the content itself. Use the active times in your own Insights instead of a universal chart.
Sources
Instagram's head wrote that each part of the app (Feed, Stories, Explore, Reels, Search and more) uses its own algorithm, and that for Reels the most important predictions include how likely you are to reshare a reel, watch it all the way through, like it and go to the audio page.
Instagram (Adam Mosseri): Instagram Ranking Explained 31 May 2023
Every link was opened on 13 October 2026. Products and policies change, so check the source before you rely on a figure.