In the “Profile Analysis” section, you’ll find “engagement rate by day” chart.
It depicts the amount of interaction your content earns relative to the size of your audience.
It’s calculated as the total number of interactions your posts receive divided by your total number of followers (then multiplied by 100%).
To exemplify it:
Let’s say your profile has 1 000 followers and 200 of them interact with your content – your engagement rate come to 20%.
Keep in mind, that ER takes on board comments and likes from users that ARE YOUR CURRENT FOLLOWERS only. It doesn’t consider engagement from people who don’t follow you at the moment.