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

# Bubble Chart

> Three-dimensional scatter with size as the third axis.

<Frame caption="A bubble chart, scatter with a third value as point size.">
  <img src="https://mintcdn.com/custral/NGCdls_pt-1YDx5S/images/charts/bubble.png?fit=max&auto=format&n=NGCdls_pt-1YDx5S&q=85&s=b55f402e9d2b0b2763b140dc0a51998c" alt="A bubble chart, scatter with a third value as point size." width="760" height="420" data-path="images/charts/bubble.png" />
</Frame>

## When to use

A Bubble chart is a Scatter chart with a third dimension encoded as bubble size. Use it when you have three numeric metrics per record and want to spot outliers and clusters at a glance.

## Required data shape

* **X axis**: numeric property.
* **Y axis**: numeric property.
* **Size**: numeric property used as the bubble area.

## Configuration

| Setting  | What it does                                         |
| -------- | ---------------------------------------------------- |
| X-axis   | The metric plotted along the horizontal axis.        |
| Y-axis   | The metric plotted along the vertical axis.          |
| Size     | The metric that drives each bubble's area.           |
| Color by | An optional property whose values color the bubbles. |

## Limitations

* More than \~200 records becomes hard to read.
* Size mapping is by area, not radius, small differences in the underlying value look smaller than they really are.


## Related topics

- [Chart drill-down](/bi/reporting/drill-down.md)
- [Reporting](/bi/reporting/overview.md)
- [Bar Chart](/bi/reporting/charts/bar.md)
- [Line Chart](/bi/reporting/charts/line.md)
- [Composite Chart](/bi/reporting/charts/composite.md)