Two ways to measure engagement
By followers: interactions ÷ followers. Easy to work out for any account, but on TikTok, Shorts and Reels most views come from people who don’t follow you, so it can top 100% and stops meaning much.
By views: interactions ÷ views. It measures how many people who saw the post did something — the better number when you have it.
Compare a post with your own usual
Industry averages mix huge brands with small creators and every niche at once. Your own median post is a fairer bar: a post at 2× your usual views is doing something your others aren’t, whatever the averages say.