# Bounce rate

> The share of visits or sessions that ended without engagement; each tool defines it differently.

Source: https://datacenter.so/glossary/bounce-rate

In GA4, bounce rate is the percentage of sessions that were not engaged, which is 100 percent minus the [engagement rate](https://datacenter.so/glossary/engagement-rate). A session is engaged if it lasted over 10 seconds, had a key event, or had 2 or more page views ([Google](https://support.google.com/analytics/answer/12195621)).

Universal Analytics counted any single-page session as a bounce, however long it lasted. Datacenter counts a visit with one pageview and under 10 seconds on the page. Because definitions differ, compare bounce rates only within one tool. See [bounce rate in GA4](https://datacenter.so/guides/bounce-rate-ga4).

## Related terms

- https://datacenter.so/glossary/engagement-rate
- https://datacenter.so/glossary/session
- https://datacenter.so/glossary/exit-rate