How the Instagram algorithm works

Instagram’s own explainer on ranking is direct about this. It says Instagram doesn’t have “a singular algorithm that oversees what people do and don’t see on the app.” Each part of the app, including Feed, Stories, Explore, Reels and Search, uses its own algorithm tailored to how people use it.

That is why advice like “post at noon” or “use this trick to beat the algorithm” tends to fall apart. A post can do well in someone’s Feed and never appear in Explore, because the two are scored on different things.

Instagram lists the signals for each surface in order of importance. The labels below are Instagram’s; the exact weights are not published.

Look at the first row of each list. Feed and Reels start with what the viewer has done before. Explore starts with the post itself, and Instagram says popularity signals matter much more there than they do in Feed. So a small account can reach strangers in Explore with a post people engage with fast, while Stories lean on relationships the viewer already has.

• Write for the surface you want. A Reel is judged partly on its own audio and visuals, a Story mostly on whether people already watch you.
• Relationships count in three of the four lists. Replies, DMs and comments from people who follow you help when those same people later open the app.
• Instagram gives no formula, so treat any tool or course claiming one with suspicion. Check what Instagram says on its own pages before paying for advice.
• A drop in reach is rarely proof of a penalty. Read the shadowban page before assuming something is wrong with the account.

Tip: Instagram’s explainer does not say how a comment that was prompted by a keyword is weighed compared with any other comment. Treat comments as one signal among several, not as a guaranteed boost.