What is Bounce Rate?
Bounce rate measures the share of sessions in which visitors open a page and leave without doing anything. In Google Analytics 4 it is the inverse of the engagement rate: a bounce is a session that lasts less than ten seconds, triggers no key event and contains no second page view.
A high bounce rate is a symptom, not a diagnosis. It can mean the page attracts the wrong audience, fails to deliver on the promise of the advert, loads too slowly or is unusable on a smartphone. It can also be harmless: someone looking for opening hours who finds them bounces away satisfied.
That is why you never read bounce rate in isolation but in context: per traffic source, per device and per page type. What matters is not the absolute number but the outlier - the one landing page losing twice as many visitors as its neighbours.
Why does Bounce Rate matter?
Since GA4, bounce rate has been defined differently from the old Universal Analytics - a bounce now means: under ten seconds, no key event, no second page. Old benchmarks are useless as a result, and comparing numbers across that system boundary leads to wrong conclusions.
Bounce Rate in practice
- 01A campaign landing page shows an 85 per cent bounce rate on smartphones but 45 on desktop - the problem is the mobile form, not the audience.
- 02A blog article with a high bounce rate but four minutes of reading time is not a problem - readers got what they came for.
- 03After cutting a form from nine fields to four, the bounce rate of the page drops measurably - friction was the cause, not the offer.
