Glossary

The Instagram analytics
glossary.

Every Instagram Reels metric that matters, defined in plain English. Start with a term below, then see it in action on any public profile with Statly.

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Statly executive KPIs

View-to-Follower Ratio VTFR

Average views divided by an account's follower count. It measures how far an account's Reels travel beyond its own audience.

Why it matters: A VTFR above 1 means Reels regularly reach people who don't follow the account, a sign the algorithm is distributing the content. It's a truer measure of reach than follower count.

Reach Consistency Index RCI

The ratio of an account's median views to its average views. It shows whether reach is steady across posts or carried by a few viral hits.

Why it matters: A high RCI means dependable reach on every post; a low RCI means a handful of outliers are inflating the average.

High Performance Factor HPF

How often an account's Reels exceed its own follower count in views.

Why it matters: It captures how frequently content escapes the follower graph, rather than how big a single hit was.

Use it for competitor research →

Breakout Performance Rate BPR

The share of an account's Reels that beat three times its median views.

Why it matters: It quantifies how often an account produces a genuine breakout, not just steady content.

Find breakouts with Trend Finder →

Engagement Stability Index ESI

How consistent engagement is from Reel to Reel across an account.

Why it matters: A high ESI means reliable engagement; a low one means one or two posts are propping up the average.

Baseline Reliability Ratio BRR

How close an account's typical Reel sits to its own baseline, reflecting the strength of its worst posts, not just its best.

Why it matters: It separates creators with a dependable floor from those carried by rare spikes.

Duration Payoff DP

Which Reel length earns the most engagement for a specific account.

Why it matters: Optimal length varies by account, so Duration Payoff finds it from the data instead of a generic rule.

Outlier Score

How far a single Reel beat its own account's median views, expressed as a multiple such as 10x.

Why it matters: A Reel at 10x an account's normal is worth studying. Measuring against the account's own baseline keeps small accounts' breakouts visible.

Surface outliers with Trend Finder →

Core metrics & concepts

Engagement rate ER

The share of viewers who interacted with a Reel, usually likes plus comments divided by views or followers, times 100.

Why it matters: It shows how compelling content is beyond raw reach.

Read the like rate guide →

Like rate

Average likes divided by followers or views, times 100.

Why it matters: A quick read on how well content resonates relative to audience size.

Read the full guide →

Comment rate

Average comments divided by followers or views, times 100.

Why it matters: Comments are a stronger signal of engagement than likes and often line up with wider distribution.

Read the full guide →

Views (plays)

The number of times a Reel was played, including replays and plays from people who don't follow the account.

Why it matters: On Reels, views are the primary reach signal because Instagram distributes them well beyond followers.

Reach

The number of unique accounts that saw a Reel.

Why it matters: Reach separates unique audience from total plays; the two diverge when replays are high.

Median vs average views

The median is the middle value of an account's Reels; the average is the mean. One viral post inflates the average but not the median.

Why it matters: Comparing the two reveals whether an account's numbers are typical or skewed by a single outlier. Statly always shows both.

Breakout (viral Reel)

A Reel that significantly outperforms its own account's average and median views.

Why it matters: Measured against the account's own baseline, a small account's breakout is a real signal even if its raw numbers are modest.

Catch breakouts early →

See these metrics on any profile.

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No card needed · 500 videos · 3 days