There is no single “good” number — it scales inversely with audience size. Nano creators (1K–10K followers) commonly post the highest rates, often 3.5–6% or more, because small audiences reply and save the most; micro-influencers (10K–100K) tend to see 1.5–3.5%; mid-tier and macro accounts settle around 1–2%; and mega accounts (1M+) frequently sit at 0.4–1%. This calculator grades your rate against tier-adjusted bands rather than one flat threshold. Remember that niche (beauty and fitness differ from B2B), format (Reels usually out-engage static posts) and the data source all shift the numbers by whole percentage points, so treat any benchmark as a rough guide.

Each basis answers a different question. ER by followers — interactions ÷ followers × 100 — is the public standard because followers are visible on any profile, so it is best for comparing accounts or estimating an influencer’s rate. ER by reach — interactions ÷ the unique accounts that saw the post — is the most meaningful measure of how a single post actually performed, since it ignores followers who never saw it. ER by impressions divides by total views (a person can be counted more than once), giving the most conservative figure. Reach and impressions come from your own Instagram Insights, so those two bases need numbers you enter by hand; a browser cannot fetch them for you.

This is an honest, offline calculator, not a scraper. Instagram’s engagement data — especially reach and impressions — lives behind its private API and each account’s own Insights, which a web page cannot access (cross-origin security blocks it, and scraping is unreliable and against the platform’s terms). So you copy your likes, comments, saves, shares and, if you use them, reach or impressions from the post or your Insights, and the tool does the math locally. That also means it works for any account whose public like and comment counts you can read, and it protects your privacy because nothing you enter is ever sent anywhere.

The calculator is 100% client-side. Your followers, likes, comments, saves, shares and Insights figures are just numbers in the page — the engagement math, the tier benchmarks and the sponsored-post estimate all run locally in JavaScript with no server, API call, database or logging in the processing path. It works offline once cached, and closing the tab discards everything you typed. The only optional network use anywhere on the site is consent-gated advertising, which never sees your inputs.