Instagram Engagement Rate Calculator

Engagement rate isn't one formula, it depends on what you divide by: reach, followers, or views for Reels. Enter your numbers once below and see all three at the same time, or connect your account and ask Claude or ChatGPT to run it on your real data instead.

Interactions Likes + comments + saves + shares

Reach Unique accounts that saw the post

Followers Total followers on the account

Views (for Reels) Total plays on the Reel

You're typing these numbers in from memory. Connect your Instagram account to Windsor.ai, then ask Claude or ChatGPT for the real number instead of retyping it every time.

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Prompt to use once connected "Calculate my Instagram engagement rate by reach, by followers, and by views for Reels, averaged across the last 90 days."

First time asking Claude or ChatGPT about your Windsor data? Add the Windsor.ai connector from the Claude directory or ChatGPT's app store. One click, no URLs to paste.

Why three formulas, not one

Most engagement rate calculators publish a single formula. In practice, Windsor customers pull engagement data through ChatGPT, Claude, and Copilot in three different shapes depending on what they're actually measuring, and each shape needs a different denominator:

What you're measuring	Formula	Fields
Engagement per person who saw the post	Interactions ÷ Reach	`media_engagement` ÷ `media_reach`
Engagement per follower	Interactions ÷ Followers	`total_interactions` ÷ `followers_count`
Engagement per view, for Reels specifically	Reel interactions ÷ Views	`media_reel_total_interactions` ÷ `media_views`

Reach-based and follower-based engagement rate can tell noticeably different stories on the same post, especially for accounts where reach regularly exceeds the follower count. Reels need their own formula because Instagram counts a Reel view differently from a feed impression.

Run all three on your real data

The calculator above works from numbers you type in once. For an ongoing answer, connect Instagram to Windsor.ai and ask directly:

Prompt "Pull my Instagram engagement data for the last 90 days. Calculate engagement rate by reach, by followers, and by views for my Reels, and tell me which posts are outperforming my average on each measure."

FAQs

Why are there three different engagement rate formulas?

Because “engagement rate” means different things depending on what you’re comparing it to. Per reach tells you how well a post converted the people who actually saw it. Per followers is the classic definition, useful for comparing accounts of different sizes. Per views is specific to Reels, since Instagram counts a Reel view differently from an impression.

Which formula should I use?

Per reach if you want to know how well a specific post performed against its own audience. Per followers if you’re benchmarking against other accounts or over time. Per views if you’re evaluating Reels specifically.

What counts as an interaction?

Likes, comments, saves, and shares added together. Windsor’s media_engagement and total_interactions fields already sum these for you.

Can this run automatically on my account instead of me typing numbers in?

Yes. Connect your Instagram account to Windsor.ai, then ask ChatGPT, Claude, or Copilot to calculate the same three rates directly from your real data.

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