What is bounce rate
Also known as: bounce, GA4 bounce rate
Bounce rate is the percentage of visits that land on a site and leave without engaging. In Google Analytics 4, it is the opposite of engagement rate: the percentage of sessions that were not engaged, meaning they lasted 10 seconds or less, had no key event and viewed only one page. A high rate can signal a slow or confusing page, or one that differs from what the visitor expected.
Bounce rate (GA4) = non engaged sessions ÷ total sessions = 100% − engagement rate
In GA4, an engaged session lasts longer than 10 seconds, has a key event or has two or more page views. Everything else counts as a bounce.
A campaign landing page has a 78% bounce rate on mobile and 35% on desktop. The ad and audience are the same; the difference is the device.
Opening the page on a phone, the team sees the form sits below a huge image that loads slowly. With the image optimized and the form moved to the top, mobile bounce falls close to desktop.
GA4 and Universal Analytics: not the same number
In the old Universal Analytics, a bounce was a single page session with no other recorded interaction. Someone who read an entire article for five minutes and left satisfied counted as a bounce.
In GA4, the logic changed: a bounce is a session that was not engaged. Anyone who stays longer than 10 seconds no longer counts as a bounce. That is why comparing today's rate with old reports leads to wrong conclusions.
When a high rate is a concern
- An ad landing page with high bounce: the click cost money and the person left.
- Much higher bounce on mobile than desktop: a sign of speed or layout problems.
- High bounce from one specific campaign: the ad may be promising something else.
- Bounce rate that jumped suddenly: something broke, such as a form or a script.
When it matters less
Pages that answer a quick question, such as opening hours or an address, can do their job in a few seconds. The visitor found what they wanted and left. That is why bounce rate should be read against each page's goal, not as an overall grade for the site.
How to reduce it
- Make sure the top of the page confirms what the ad or search result promised.
- Improve speed, especially on mobile.
- Keep the next step visible without scrolling.
- Avoid pop ups that cover the page right on arrival.
- Offer related paths for people who want to keep going.
A measurement caution
Because engaged sessions depend on time and events, site setup changes the number. A key event mistakenly firing on page load makes bounce rate plummet without anything improving. Before celebrating or worrying, check that measurement is right.
Frequently asked questions
What is bounce rate?
The percentage of visits that land on a site and leave without engaging. In GA4, it is the percentage of sessions that were not engaged.
How does GA4 calculate bounce rate?
It divides non engaged sessions by total sessions. That equals 100% minus the engagement rate.
What is a good bounce rate?
It depends on the page type and traffic source. Compare similar pages with each other and track the trend, rather than chasing a single number.
Does bounce rate affect SEO?
Google does not list Analytics bounce rate as a ranking factor. But the causes of high bounce, such as slow pages or pages that do not answer the search, hurt the experience.
Why did my bounce rate change when I moved to GA4?
Because the definition changed. In GA4, anyone who stays longer than 10 seconds or completes a key action is not a bounce, which usually lowers the number.
Related terms
- Engagement rateEngagement is the measure of how much people interact with content or a website: likes, comments, shares...
- Core Web VitalsCore Web Vitals are three metrics that measure the real experience of people visiting a page: LCP, how long...
- Landing pageA landing page is the page a person reaches after clicking an ad, email or link, built to lead to a single...
- Conversion rateConversion rate is the percentage of people who took the desired action out of everyone who had the chance...
- Vanity metricsVanity metrics are numbers that make a company feel good but do not tell it what to do next: total visits...
- CTAA CTA (call to action) is the element that invites a person to take the next step: a button such as "Get...
Rodrigo Fávaro
Founder of ROO3, a marketing and technology agency in São José do Rio Preto, Brazil. Builds AI products running in production (Tobia, gerar.app, Pense Mercado) and maintains the AI Benchmark, a public ranking of AI models.
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