> ## Documentation Index
> Fetch the complete documentation index at: https://cubed3-feat-druid-driver-streaming.mintlify.site/llms.txt
> Use this file to discover all available pages before exploring further.

# Area

> Show volume or part-to-whole trends over time with a filled region beneath the line.

Area charts add a filled region beneath the line. The fill communicates magnitude and cumulative volume, making area charts especially effective for stacked part-to-whole breakdowns over time.

## Variants

### Stacked

Each series is stacked on top of the previous one. The top edge shows the cumulative total; each filled band shows the individual contribution. Use this for part-to-whole breakdowns over time (e.g. revenue by product category over months).

### Percentage stacked (Stack %)

Each series is normalized to 100% at every X-axis value, showing proportional contribution over time. Use when relative share matters more than absolute volume.

### Overlaid

All series share the same baseline. Use only when series are clearly separated in value and you want to compare trajectories rather than totals — with many series, fills will occlude each other.

## Stacking

Set stacking behavior in the **Color & stacking** section of the Style tab. The **Stack**, **Stack %**, and **Overlay** options are the relevant modes for area charts.

See [Color & stacking](/docs/explore-analyze/charts/configuration/color-and-stacking) for palette options and stacked segment sorting.

## Axis behavior

Area charts use a temporal X axis for time dimensions — continuous and time-aware. For non-time fields, the axis is ordinal.