What is engagement rate?

Updated October 2026

The short answer: Engagement rate is interactions (likes, comments, shares and saves) divided by an audience figure, times 100. Divide by followers for a public, comparable number; by reach for a more accurate one from your own insights; by views for a single video or reel. Always say which one you used.

The basic idea

A follower count tells you how many accounts could see your posts. Engagement rate tells you how many cared enough to react. Brands, creators and the platforms’ own analytics all use some version of it, because it’s harder to fake by accident than a raw count and easier to compare across accounts of different sizes.

The formula always has the same shape:

Engagement rate = interactions ÷ audience × 100

What changes is what you count as an interaction and what you use as the audience.

What counts as an interaction

Some people add profile visits, link taps or replies to stories. That’s fine for tracking your own account, but it makes your figure impossible to compare with anyone else’s. For a public number, likes plus comments is the common baseline; add shares and saves when you have them and say that you did.

Not all interactions are equal. A like takes a fraction of a second. A share or a DM send means someone thought another person should see it. Instagram’s head, Adam Mosseri, has named sends among the signals Instagram weighs most, which is a good reason to watch that number on its own, not just inside the total.

Formula 1: by followers

(average interactions per post ÷ followers) × 100

Say a hypothetical Instagram account has 4,500 followers. Across its last ten regular posts it averages 160 likes, 12 comments, 8 shares and 20 saves: 200 interactions. 200 ÷ 4,500 × 100 = 4.44%.

This is the version you can calculate for any public account, which is why brands and our Instagram engagement rate calculator use it. Its weakness is that it assumes every follower had a chance to see the post. They didn’t.

Formula 2: by reach

(interactions on a post ÷ accounts reached by that post) × 100

Same account, one post: insights say it reached 2,800 accounts and got 200 interactions. 200 ÷ 2,800 × 100 = 7.14%.

That’s a fairer measure of how good the post was, because it only counts people who actually saw it, including non-followers. The catch is that reach is private. You can calculate it for your own account; for anyone else, you have to ask for their insights. A related variant divides by impressions (total views, including repeat views by the same account), which gives a lower figure again.

Formula 3: by views

(interactions on a video ÷ views of that video) × 100

This is the natural one for TikTok and for Instagram reels, where most viewers often don’t follow you. Say a hypothetical TikTok video has 18,000 views, 1,100 likes, 35 comments, 40 shares and 85 saves: 1,260 interactions. 1,260 ÷ 18,000 × 100 = 7.0% per view.

If that account has 3,000 followers, the per-follower figure for the same video is 1,260 ÷ 3,000 × 100 = 42%. That isn’t a mistake. It means the video traveled well beyond the existing audience, which on TikTok is normal: the platform has said follower count isn’t a direct factor in what it recommends. Our TikTok engagement rate calculator shows both numbers side by side.

Which formula to use when

What’s a “good” rate?

There’s no official benchmark from either platform, and published averages vary a lot with who measured, how and when. As a very rough reading for follower-based Instagram rates, our calculator treats under 1% as low, 1% to 3% as common and above 3% as strong, but niche, format and account size move those lines considerably. Per-view rates on TikTok videos tend to run higher than follower-based rates on Instagram simply because the denominator is different. The most useful comparison is with your own account last month.

Why rates fall as accounts grow

Almost every account sees its follower-based rate drop as it gets bigger. That’s not necessarily a sign anything is wrong. Some of the reasons:

• Not every follower sees every post. Feeds are ranked, so a growing share of followers simply aren’t shown a given post.
• Early followers are closer. Friends, family and first fans interact with almost everything. Later followers are strangers with weaker ties.
• Followers accumulate, attention doesn’t. People who followed three years ago may have stopped using the app, but they still count.
• Viral spikes bring loose followers. A video that reached millions may add thousands of followers who liked that one clip, not the account.

This is why comparing a 900-follower account with a 90,000-follower account on engagement rate alone is misleading. Compare within a size band.

What bought followers do to the maths

Followers from a package raise the count without adding interactions. So the follower-based rate falls by a predictable amount. Take a hypothetical account with 2,000 followers averaging 100 interactions per post: 5.0%.

To get back to 5% at 3,000 followers, the account would need 150 interactions per post. The reach-based and view-based rates, on the other hand, stay roughly where they were, because bought followers don’t change who actually sees and reacts to the posts. That’s also why a brand that asks for insights will see the account more or less as it was before the order.

The lesson is the same one we give on our does buying followers work page: keep any package modest relative to the account, and don’t present the resulting rate as something it isn’t.

How brands read engagement rate

• Consistency over peaks. Ten posts at a steady 3% say more than one at 12% and nine at 0.8%.
• Comments relative to likes. Very few comments next to many likes can mean a passive audience or inflated likes.
• Reach and story views. Many brands ask for screenshots or recordings of these, because they show how many people are actually seeing the content.
• Cost per interaction. Fee divided by expected interactions. A $400 post expected to get 500 interactions is $0.80 each; that’s easier to compare across creators than follower counts. Our money calculator gives a rough sponsored-post rate estimate to check fees against.
• Red flags. Sudden follower jumps, generic comments and empty-looking follower lists. Our guide on spotting fake followers covers the audit.