How-To Guide
Carousels or Reels: which should a brand post on Instagram, and when?
Reels reach people who don't follow you; carousels earn more saves and engagement per view. The studies side by side, and a weekly mix to start with.
By Bell Chen, founder of Superdirector — how the analysis works.
At a glance
Carousels or Reels: which should a brand post on Instagram, and when?
Post both, for different jobs. Reels are built to find strangers: in Buffer's 2026 dataset (4M+ posts) a Reel reached 36% more accounts than a carousel did. Carousels get more out of the people who do see them, with around 109% more engagement per person reached in the same analysis, and they led on saves among brands above 10,000 followers in Socialinsider's 2025 data. If you are small and need new followers, lean on Reels; if you need people to understand, save and act on something, use a carousel. Then compare each Reel with your past Reels, and each carousel with your past carousels.
- Reels: reach, comments, shares, anything that needs motion.
- Carousels: saves, detail, explanations, posts you can make without filming.
- The studies measure different things, so read the metric before the headline.
What each format is built to do
Instagram does not rank everything with one system. Its 2023 ranking explainer says each part of the app uses its own algorithm tailored to how people use it. Reels are designed to help people discover new things, with an emphasis on entertainment, and the majority of what someone sees there comes from accounts they do not follow. Feed mixes posts from accounts you follow with recommended posts, and shows a mixture of videos, photos and carousels.
So the formats start in different places. A Reel competes for strangers in the Reels tab, where Instagram predicts how likely someone is to reshare it, watch it all the way through, like it and visit the audio page. A carousel lives mainly in Feed, where Instagram looks at whether someone will spend a few seconds on the post, comment, like, share or tap your profile photo. The diagram below turns that into a choice by goal.
When enlarged, scroll horizontally to read the diagram.
Original diagram; the two figures are Buffer's published 2026 analysis.
Original visual by Superdirector editorial team. Creation date not recorded.
What the published studies say, side by side
The most widely quoted numbers on this question come from tool vendors' own datasets. They are useful, but they count different things, which is why headlines seem to contradict each other.
| Study | Sample | What it measured | Carousels | Reels |
|---|---|---|---|---|
| Socialinsider, 2025 data, published Feb 2026 | 67.5M posts, 579,000 brand accounts | Engagement divided by followers | 0.55% engagement; most saves above 10K followers | 0.52% engagement; most comments |
| Socialinsider, Q3 2026 update | Same tracking | Engagement by followers | 0.50% | 0.48% |
| Buffer, Oct 2026 | 4M+ posts | Reach, and engagement per person reached | ~109% more engagement per person reached | 36% more reach |
| Metricool 2026, as reported by Wavevision | 24.3M posts | Saves against single images | 9 times more saves than single images | Not compared on saves |
Read the third column before the last two. Socialinsider divides by followers, so its carousel lead is small (0.55% against 0.52%). Buffer divides by the people each post reached, and because Reels reach more strangers who rarely engage, the carousel lead per person reached grows to about 109%. On a second, simpler engagement measure Buffer puts carousels 12% ahead. Socialinsider even reports that carousels got the most views at every account size in 2025, which sits oddly beside Buffer's reach figure until you remember that a carousel can be shown to the same person more than once. The figures are not interchangeable; they answer different questions.
When a Reel is the better post
- You need people who have never heard of you. Instagram says Reels are designed for discovery, and Buffer's 36% reach gap points the same way.
- The idea needs motion, a face or a voice: a product demo, a reaction, a founder explaining why they built it.
- You want comments. Socialinsider found Reels earned the most comments of any format in 2025.
- A sound or trend in your niche is live this week. Instagram counts a visit to the audio page among the actions it predicts for Reels.
Small accounts feel this most. Wavevision reports Socialinsider measuring Reels at a 9.78% reach rate against 8.80% for carousels among business accounts with 1,000 to 5,000 followers. When few people follow you, the format that shows you to strangers matters more.
When a carousel is the better post
- The content is something people keep: steps, a checklist, a comparison, a price breakdown. Among brands past 10,000 followers, carousels led Socialinsider's save counts.
- It needs detail a 20-second video cannot hold, such as what each plan includes or how to use a product in five steps.
- You want more from the followers you already reach: the per-person engagement gap is the carousel's strongest number.
- You cannot film this week. A carousel needs a design template and an idea; up to 20 slides fit in one post, per Instagram's publishing guide.
Carousels also suit what Instagram says it predicts. Explore's most important predicted actions are likes, saves and shares, and a recap slide worth saving is easy to design on purpose. Our guide to writing hooks that stop the scroll applies to the first slide as much as to the first second of a Reel.
A weekly mix to start with
No study tells you the right ratio for your brand, so start from your goal and adjust from your own numbers. These are our suggested starting points for a founder posting about five times a week, not measured results:
| Your situation | Starting mix (5 posts a week) | Watch first |
|---|---|---|
| Under about 10,000 followers, need new people | 3 Reels, 2 carousels | Reach from non-followers, sends |
| Established audience, need them to act | 2 Reels, 3 carousels | Saves, profile visits, link taps |
| Launching or selling one product | Reel to introduce it, carousel the same week to explain it | Saves and clicks on the carousel |
| No time to film | Carousels plus one simple Reel | Whether Reel reach justifies the time |
For reference, brands in Socialinsider's 2025 sample posted about 8 Reels, 7 single images and 5 carousels a month. A planning sheet for the first two weeks is free to copy; slotting it into a month is covered in our content calendar guide, and growing with Reels covers the video half.
How to tell which works for your account
Compare each format with itself. A Reel's view count next to a carousel's like count tells you nothing; this month's carousels against last month's carousels do. Wavevision's advice is to track engagement rate and save rate by format over at least 30 days, not post by post, and that matches how the formats behave: a carousel can keep collecting views when Instagram shows it again.
- Reels: reach from non-followers, average watch time, sends per reach, follows from the post.
- Carousels: saves per 1,000 reached, shares, how far people swipe, profile visits.
- Both: what happened after the post, such as link taps, sign-ups or sales you can trace.
Signals shift, so treat any rule here as a starting point. Buffer reports that Adam Mosseri now ranks three signals highest: watch time, likes divided by reach, and sends divided by reach, with sends mattering slightly more for reaching people who do not follow you. A post people send to a friend helps either format.
Where Superdirector fits
Superdirector, the site you are reading, is our product, so weigh this accordingly. Today it remakes formats that are taking off in your niche as carousels, X posts, video scripts and storyboards in your brand, and on the Growth plan it posts Instagram carousels and single X text posts for you after your first approval or with standing Auto-post. Finished AI video, posting Reels and full autopilot are coming soon, so for now the Reels half of the mix is filmed and posted by you. You remain the publisher. See how it works.