Someone asked, why is my bounce rate so low? It was normal before, but now it is only 4%, or a few tenths of a percent?
Based on my personal experience, there are several main reasons for an abnormally low bounce rate:
Setting too Many Key Events
The formula for calculating Bounce Rate is:
Bounce Rate = 1- Engagement Rate=1-Engaged Session/Sessions
An engaged session is a session that meets any of the following criteria:
- Lasts longer than 10 seconds
- Has a key event
- Has 2 or more screen or page views
Setting too many key events will increase the percentage of engaged sessions, which will in turn reduce the bounce rate.
For example, if the impression event of an e-commerce product is set to key events, this event will appear as soon as the page is opened, and the bounce rate will naturally be very low.
The Timer for Engaged Sessions is set too Short
The time setting for engaged session is too short. The default setting is 10 seconds. If you set it to 5 seconds, the proportion of engaged session will be too high and the bounce rate will be too low.
To adjust the location in GA4, click 「Admin」——「Data collection and modification」——「Data streams」to enter theWeb stream details, then click 「Configure tag settings」——「Show more」——「Adjust session timeout」to see:
The default value here is 10 seconds. Check if there is any modification.
