Engagement rate

Engagement rate is the percentage of a post’s audience that takes a measurable action on it — like, comment, share, save — usually computed against either reach (people who saw it) or followers (everyone who could have).

There are two common denominators and they tell different stories. Engagement rate by reach (ER by reach) is engaged users / people who saw the post. Engagement rate by followers (ER by followers) is engaged users / total followers. ER by reach is the cleaner signal for content performance because it strips out distribution differences; ER by followers is the metric most native platform analytics show by default.

What counts as engagement varies by platform. LinkedIn weighs comments and reshares more heavily than likes; Instagram weighs saves and shares; TikTok weighs completion rate and replays alongside the explicit actions. A post’s engagement rate is also category-dependent — a B2B founder post on LinkedIn at 8% ER is exceptional; an e-commerce post on Instagram at 2% is good.

Engagement rate is the metric most directly under your control. Follower count is a vanity metric and reach depends on the platform; ER is the part you can move with better content. Watching ER trend over a quarter tells you whether your content is improving — follower count tells you almost nothing.