Engagement rate
The share of an audience that interacts with content — likes, comments, shares, saves. Several formulas compete, so always state which one you use.
What engagement rate measures
Engagement rate (ER) captures how actively an audience responds to content, expressed as interactions relative to an audience denominator. It is the most-used quality metric in creator vetting — follower counts can be bought, sustained engagement is much harder to fake — but it only means something once the formula is fixed.
The competing formulas
The same post can score 2 % by followers and 8 % by reach. Neither is wrong; they answer different questions. Comparisons are only valid within one formula, one platform and roughly one account-size bracket.
Reading the numbers
ER declines with account size almost everywhere — micro creators routinely out-engage celebrities in relative terms, which is a core argument for micro and mid-tier campaigns. Weight the interaction types too: saves and shares signal far more intent than likes. Distorted patterns matter as much as levels: giveaway-inflated comment storms, engagement pods, or high engagement on old posts combined with a suddenly grown follower base are classic red flags for bought audiences.
In agency practice
Agencies live in ER at three moments. Vetting new roster talent: is the audience real and awake? Pricing: engaged niche audiences justify higher implied CPMs. And campaign reporting: did the branded content hold up against the creator's organic baseline? Branded posts typically engage somewhat below organic — a collapse, though, signals an audience mismatch. The operational rule that prevents most disputes is simple: every report and every media kit states the formula and the time window right next to the number.
Related terms
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