Engagement rate is the percentage of sessions that meet a defined threshold of meaningful interaction — commonly lasting longer than a set duration, including two or more pageviews, or triggering a specific conversion event — out of total sessions.
It's essentially the inverse framing of bounce rate: where bounce rate counts single-page sessions with no interaction, engagement rate counts sessions that clear a bar for meaningful activity, and the two can be roughly complementary depending on how a platform defines the threshold. Because the exact threshold varies by tool, engagement rate figures aren't always directly comparable across different analytics platforms, even for the same underlying traffic.
If a site records 5,000 sessions in a month and 3,100 of them last longer than 10 seconds or include a second pageview, the engagement rate for that month is 62%.
They're roughly complementary opposites — bounce rate counts single-page sessions with no further interaction, while engagement rate counts sessions that meet a threshold of meaningful activity, such as a minimum duration or multiple pageviews.
It depends on the platform's specific definition, but common thresholds include a session lasting longer than 10 seconds, including two or more pageviews, or triggering a defined conversion event.
Generally yes as a directional signal, but like most rate metrics it should be read with context — a very short visit that fully answers a question can still be a successful outcome even without meeting a strict engagement threshold.