The share of people who interacted with a post, out of a base you choose. The base can be reach, followers, impressions or video views, and the result changes a lot depending on which one you use.
Formula
Engagement rate by reach = engagements ÷ reach × 100 · Engagement rate by followers = engagements ÷ followers × 100
Example
Meera's Reel got 900 engagements, reached 30,000 people, and she has 12,000 followers. By reach the engagement rate is 900 ÷ 30,000 = 3%. By followers it is 900 ÷ 12,000 = 7.5%.
How you'll hear it
“What base is this engagement rate on, reach or followers? Otherwise I can't compare it with last month.”
What it helps you decide
Which formats and topics to make more of, and which to drop. It also decides whether a creator is worth paying, since a high follower count with low engagement means few people are paying attention.
Where people misread it
People compare rates calculated on different bases, or compare a viral post (rate by followers is inflated) with a normal one. A high rate driven by giveaway tags or contest comments says little about buying interest.
The story
Meera's agency sends a monthly report. The headline: the giveaway Reel had a 7.5% engagement rate, the best of the month.
That number is engagements divided by followers. The Reel reached far more people than Meera has followers, so dividing by followers makes it look bigger.
| Reel: engagements | 900 |
| Reel: reach | 30,000 |
| Reel: engagement rate by followers | 7.5% |
| Reel: engagement rate by reach | 3% |
| Carousel: engagements | 320 |
| Carousel: reach | 4,000 |
| Carousel: engagement rate by followers | 2.67% |
| Carousel: engagement rate by reach | 8% |
|---|
By reach, the plain carousel of new arrivals did better. Of every 100 people who saw it, 8 did something, against 3 for the Reel.
The rate also hides what kind of engagement it was. Most of the Reel's comments were tags for the giveaway. The carousel brought 25 direct messages asking for prices and sizes.
So Meera asks for two things in every report: engagement rate by reach, and the engagements split by type, with direct enquiries shown on their own line.
All figures are fictional and illustrative.
Work out engagement rate on both bases
The example's numbers are filled in. Replace them with yours.
This post reached more people than you have followers, so the rate by followers flatters it. Use the rate by reach to compare posts.
Don't confuse it with
- Click-through rate: counts only clicks on a link, divided by impressions.
- Conversion rate: counts purchases or sign-ups, not interactions.
Related terms
Want to use this at work? AI-led Social Media Excellence is aFactor's 16-week program for social media work.
Sources
- How to calculate engagement rate, Hootsuite, 2026
- Social media metrics to track, Hootsuite, 2026