The bounce rate in GA4 is calculated using the formula "bounce rate = 100% - engagement rate". The engagement rate indicates the percentage of sessions with engagement among all sessions. In other words, a bounce in GA4 refers to a session without engagement. While analysis centered on user actions is important, the bounce rate in GA4 is a useful indicator.
The meaning of "bounce rate" is different in GA4 and UA
GA4 and UA have different meanings for Bounce Rate. GA4 Bounce Rate indicates the general manager email lists percentage of sessions with no engagement.
On the other hand, the UA bounce rate is defined on the official website as "the percentage of one-page sessions where nothing was done on the page." Any session that leaves after only one page is considered a bounce, regardless of whether the user leaves the page immediately or finishes reading it to the end. There was a problem that even if the user's request was met, it would be counted in the bounce rate.
Reference: [UA→GA4] Comparison of metrics: Google Analytics 4 and Universal Analytics - Analytics Help
The number of sessions is explained in detail in the following article. Please refer to it.
Reference: What is the number of sessions? Explaining the difference between the number of page views and the number of users, and the measurement rules
How to calculate "bounce rate" in GA4
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shaownhasan
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