Instagram Engagement Rate Calculator

The standard formula is (likes + comments) ÷ followers × 100, averaged over recent posts. Some analysts use reach instead of followers ((likes + comments) ÷ reach × 100), which better reflects how Instagram distributes content today — but follower-based ER remains the comparison standard brands use.

Rule of thumb: 1-3% is average, 3-6% is good, above 6% is excellent. Small accounts run hotter — under 5K followers, 5-8% is common — while accounts over 100K typically sit near 1-2%. Judge against your size bracket, not the global average.

Usually distribution, not content: Instagram shows feed posts to a fraction of followers, and that fraction shifts with the algorithm. Falling ER with steady content often means a stale audience (inactive followers accumulating) or a format mismatch — Reels currently earn more reach than static posts for most accounts.

Brands typically average the last 10-12 feed posts, excluding outliers like giveaways. A single post's ER swings too much to mean anything.

Yes — it's usually the first filter in influencer vetting. A 50K account at 4% beats a 200K account at 0.8% for most campaigns, because ER approximates how much of the audience is real and paying attention.

Yes — the Captapi Instagram API returns followers, likes, and comments for any public account as JSON, so you can compute ER for hundreds of accounts programmatically. A free key includes 100 credits.