What it is good for
Engagement rate is a fast read on whether creative resonates: a version that earns more reactions and saves at similar spend is usually the stronger hook. On paid social it also feeds the signals that shape delivery.
Where it misleads
Engagement is not intent. A meme can out-engage a product ad and sell nothing. Chase engagement rate as a goal and you optimize for entertainment, not pipeline. Treat it as a creative diagnostic, then judge the money on CPA and ROAS.
Common questions
How is engagement rate calculated?
Divide total engagements (clicks, reactions, comments, shares, saves) by reach or impressions over the same period. Definitions vary by platform, so compare like with like.
Is a high engagement rate good?
It is a good creative signal but a weak business metric. High engagement with low conversion means the ad entertains without selling, so read it alongside CPA and ROAS.