Engagement rate
GA4 engagement rate / engaged sessions / engaged session / bounce rate GA4
Engagement rate is the share of visits to your website that Google Analytics 4 counts as engaged. A visit qualifies when it passes a timer that starts at 10 seconds, reaches two page views, or records a key event. Bounce rate is everything else, so the two add up to 100%.
Google defines the arithmetic in one line on its metrics reference: engagement rate equals engaged sessions divided by total sessions. A session is one visit, and by default it ends after 30 minutes of inactivity. The judgment sits in the word engaged.
The same reference lists three ways a session qualifies. It lasted 10 seconds or longer, it had at least one conversion event, or it had two or more page or screen views. Google's help article on the metric words the timer slightly differently, as a session that lasts longer than 10 seconds.
The 10 seconds is a default. In the web data stream settings, an option called Adjust timer for engaged sessions lets an admin choose the number of seconds a session needs. Change it, and every engagement rate from that day on is measured against a different bar.
Bounce rate in Google Analytics 4 is the percentage of sessions that were not engaged. Google excludes first_visit and session_start from the count even when someone marks them as key events. Most reports leave both metrics out until an Editor or Administrator adds them.
In practice
A home services company records 1,200 sessions in a month. Of those, 780 pass the timer, reach a second page or record a key event. The engagement rate is 780 divided by 1,200, which is 65%, and the bounce rate is 35%. Raise the timer to 30 seconds and fewer visits qualify on time alone, so the rate can drop with no change in how people use the site.
Not the same as
- Key event
- A key event is an action you marked as important, such as a form submission. Recording one is one of three ways a visit becomes an engaged session.
Why it matters to you
Engagement rate is a quick read on whether paid traffic stays. A landing page with a low rate is receiving visitors who leave almost at once, and Google's own advice is to check whether the ad matches the page. Compare the rate only across periods when the timer and the key events stayed the same.
What to ask or check
- 01Has anyone changed the engaged session timer on this property's web data stream, and on what date?
- 02Which landing pages have the lowest engagement rate, and which campaigns send visitors to them?
- 03Which key events are set up, and does any of them fire on every page load?
What people get wrong
That a high engagement rate means people liked the page. A key event set to fire on every page load makes every visit count as engaged, and the rate climbs without a single visitor behaving differently.
Red flags
- A key event that fires on page load, which counts every visit as engaged.
- An engagement rate compared across a date when someone changed the engaged session timer.
Where you will see it
Google Analytics 4 leaves engagement rate and bounce rate out of most reports by default. An Editor or Administrator adds them to a detail report, such as Pages and screens, through Customize report.