PostEaseThe short answer
Use Reels to reach people who do not follow you yet, and carousels to engage the people who do. Buffer’s 2026 engagement report found Reels reached about 1.36 times as many people as carousels, while carousels earned roughly twice the engagement rate. A Reels strategy is therefore a reach strategy: make short videos a stranger would watch to the end and send to a friend.
That is also what Instagram says it ranks Reels on. Its own explanation names the likelihood that a viewer will reshare a reel, watch it all the way through, like it, and open its audio page as the most important predictions, and says it shows low-resolution, watermarked and already-posted reels less.
What Instagram says it ranks Reels on
Instagram’s ranking explainer, written by its head Adam Mosseri, lists the signals for Reels in rough order of importance, and the predictions the system makes from them. It dates from 2023, and Instagram has changed details since, but it remains the platform’s own public account of how Reels are ranked.
- Your activity: the reels a viewer has liked, saved, reshared and commented on recently.
- The viewer’s history with the account that posted, which for a Reel is often none.
- Information about the reel itself: its audio, its visuals and how popular it is.
- Information about the account that posted, such as its follower count and how much engagement it gets.
Reels against carousels and images
Two 2026 studies measured Reels from different angles. Buffer divided engagements by reach, so its figures say how many of the people who saw a post reacted. Socialinsider divided reach by followers, so its figures say what share of an account’s followers saw a post. Neither counts the people a Reel reached beyond your followers in the second measure, which is where Reels do most of their work.
| Format | Engagement rate (Buffer) | Reach rate among followers (Socialinsider) |
|---|---|---|
| Reels | 3.31% | 4.10% |
| Carousels | 6.90% | 4.50% |
| Single images | 4.44% | 4.00% |
What makes a Reel travel
Each of Instagram’s predictions points at a choice you make before posting:
- Watched to the end: open with the payoff or the question, not a logo or a greeting, and cut every second that does not move the video along. A shorter Reel that people finish beats a longer one they leave.
- Reshared: make something a viewer would send to one particular person, such as a tip they need, a joke about their job, or a place to go together.
- Liked: give a clear reason to react, such as a result, a before and after, or a strong opinion.
- Opened the audio page: original or trending audio used well invites others to make their own version.
What holds a Reel back
Instagram says it makes low-resolution and watermarked reels, and reels that have already been posted on Instagram, less visible. In practice that means exporting a clean file at full resolution rather than downloading a video with another app’s logo on it, and making something new rather than reposting what is already on the platform.
Sharing Reels to Facebook
Instagram lets you share a Reel to Facebook as well, but the same video does not do the same job there. In Socialinsider’s 2026 study of brand pages, Reels reached about 0.55% of a Facebook page’s followers, less than images (1.20%), albums or text posts. Sharing costs nothing, so it is worth doing, but judge the Facebook copy on its own numbers and do not plan a Facebook strategy around Reels alone.
A Reels plan you can keep
Buffer’s 2026 frequency guide suggests 3 to 5 Instagram posts a week across formats. A workable split for most accounts is two or three Reels to reach new people and one or two carousels to give those people a reason to stay. Steady beats bursts: a rhythm you hold for three months will teach you more than a week of daily posting.
Judge each Reel against your own recent ones, not against another account. Reach tells you whether it found new people; average watch time against its length tells you whether they stayed; shares tell you whether they cared enough to send it on.
Questions
Are Reels better than carousels on Instagram?
For reach, yes: in Buffer’s 2026 data, Reels reached about 1.36 times as many people. For engagement, no: carousels earned a median 6.90% of reach against 3.31% for Reels. Use both, for different jobs.
What does Instagram rank Reels on?
Instagram says its most important predictions are how likely you are to reshare a reel, watch it all the way through, like it, and go to its audio page.
Do watermarks hurt Reels reach?
Instagram says it makes low-resolution and watermarked reels less visible, as well as reels already posted on Instagram.
How many Reels should I post a week?
Buffer suggests 3 to 5 Instagram posts a week in total. Two or three of those as Reels, kept up for months, is a sound start for most accounts.
Sources
- Buffer, The state of social media engagement in 2026, March 2026.
- Socialinsider, Social media reach has a 14% YoY decrease on Instagram, September 2026.
- Buffer, How often to post on social media in 2026: a data-backed guide, January 2026.
- Instagram, Instagram ranking explained, May 2023.