> ## Documentation Index
> Fetch the complete documentation index at: https://docs.aloftly.com/llms.txt
> Use this file to discover all available pages before exploring further.

# Bounce rate

> GA4 bounce rate derived from sessions and engaged sessions.

| Contract           | Value              |
| ------------------ | ------------------ |
| Metric key         | `ga4.bounce_rate`  |
| Source             | Google Analytics 4 |
| Status             | active             |
| Type               | derived            |
| Semantic version   | 1                  |
| Catalog visibility | Picker-eligible    |

## How it's calculated

```text theme={null}
(sum(ga4.sessions) - sum(ga4.engaged_sessions)) / nullif(sum(ga4.sessions), 0)
```

### Built from

* `ga4.sessions`
* `ga4.engaged_sessions`

## Known caveats

* Returns null until the engaged-session coverage guard is complete.

## Where this appears

* Dashboard builder
* AI traffic datasets

<AccordionGroup>
  <Accordion title="Grain and identity" icon="ruler">
    derived\_period; entity: store; same-day fold: sum; additivity: non\_additive.

    **Join and identity keys:** none.
  </Accordion>

  <Accordion title="Filters and boundaries" icon="filter">
    * Organization, store, and GA4 property are resolved server-side.
    * Reads use a half-open interval: recorded\_at >= start and recorded\_at \< end.
    * Site reports preserve acquisition/device segments; page reports retain the top 75 pages per day.
  </Accordion>

  <Accordion title="Timezone, currency, and freshness" icon="clock">
    **Timezone.** GA4 report dates are property-calendar dates normalized to UTC-midnight labels. They are not rebucketed in the browser timezone.

    **Currency.** Not applicable.

    **Freshness.** Computed by Cube at read time.
  </Accordion>

  <Accordion title="Version history" icon="clock-rotate-left">
    | Date       | Change                                                             |
    | ---------- | ------------------------------------------------------------------ |
    | 2026-08-03 | Bound the metric to the executable certified semantic release.     |
    | 2026-07-27 | Registered GA4 traffic and page contracts in the semantic catalog. |
  </Accordion>
</AccordionGroup>