Glossaire · SEO

Bounce rate

Bounce rate is the percentage of sessions during which a visitor views a single page of a website and then leaves without triggering any further interaction. Historically, in Universal Analytics, a bounce was a session limited to one single request to the server. With GA4, the logic is reversed: bounce rate there is the percentage of sessions that are not considered engaged, meaning sessions shorter than 10 seconds, with no second page view and no conversion event. Bounce rate is calculated by dividing the number of single-page (or non-engaged) sessions by the total number of sessions. It is expressed as a percentage and serves as a relevance indicator: a high rate may signal a mismatch between search intent and the content offered, a slow page, or a degraded user experience. It should always be interpreted according to the type of page and the goal pursued.

Bounce rate is one of the most cited yet most misinterpreted metrics in SEO. Reading it correctly depends entirely on the context of the page and the measurement tool used.

How bounce rate is calculated

The calculation is based on the ratio of sessions with no interaction to total sessions. In Universal Analytics, a bounce was counted whenever a session generated only one request to the server, with no click to another page. In GA4, Google redefined the concept: a session is "engaged" if it lasts more than 10 seconds, includes at least two page views, or triggers a conversion event. The GA4 bounce rate therefore corresponds to the proportion of sessions that meet none of these conditions.

Key takeaway

The same traffic can show a very different bounce rate depending on whether you measure with Universal Analytics or GA4. Always compare periods measured with the same tool.

Why it matters

Google has confirmed that bounce rate is not a direct ranking factor. Even so, it remains a valuable diagnostic signal. An abnormally high rate on a high-stakes page often reveals a gap between the targeted search intent and the content delivered, insufficient loading speed, or an unengaging design.

How to improve it

To reduce a problematic bounce rate, align content with the query, refine the hook above the fold, and optimize speed. Good internal linking also encourages visitors to keep browsing. The ultimate goal is never the bounce itself, but the conversion rate that follows from it.

FAQ

Questions fréquentes

No. On a page that perfectly answers a question, the visitor may leave satisfied without browsing further. Bounce rate must be analyzed against the page's intent: it is a problem on a product page, but normal on a short informational article.

In GA4, engagement rate is the primary metric: it measures the share of engaged sessions. Bounce rate is simply its complement (100% minus the engagement rate), reintroduced by Google after the metric was initially dropped.

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