Charts & Visualizations

Stacked Area Chart

A variation of the area chart where multiple data series are stacked on top of each other to show both individual values and their contribution to the total.

Definition

Stacked area charts display multiple data series by stacking each series on top of the previous ones, creating a cumulative visualization. This chart type is particularly useful for showing both individual component values and their contribution to the total, making it ideal for part-to-whole analysis over time. The stacking allows viewers to see both the overall trend and the changing composition of the whole.

Examples

Traffic sources by device type shown as stacked areas, revealing both the total traffic trend and the changing proportion of each device type over six months

Chart Visualization

This example includes an interactive chart visualization with 6 data points.

Chart type: area

Usage

Best Used For

  • Showing part-to-whole relationships over time or sequence
  • Comparing proportions between categories while seeing the total
  • Visualizing composition changes within a total that itself may be changing
  • Displaying cumulative values across multiple categories
  • Tracking market share or percentage distributions over time

Data Requirements

[Object]

When to use this chart

Channel mix over time

Data shape: Revenue or spend share by platform (Meta, Google, TikTok)

Limit to 3–5 channels; aggregate long tail into Other to preserve readability

Source: Knaflic, "Storytelling with Data" (2015); AMA Marketing Analytics guidelines

Limitations

Important Considerations

  • ⚠Hard to compare non-adjacent series due to varying baselines
  • ⚠Can be misleading due to changing baselines for upper series
  • ⚠Complex to interpret with many categories (limit to 5-7 series)
  • ⚠Small values may become difficult to see or compare
  • ⚠Requires careful color selection to distinguish adjacent areas

Best Used For

  • Showing part-to-whole relationships over time or sequence
  • Comparing proportions between categories while seeing the total
  • Visualizing composition changes within a total that itself may be changing
  • Displaying cumulative values across multiple categories
  • Tracking market share or percentage distributions over time

Supplemental Resources

Frequently asked questions

Common questions about Stacked Area Chart, answered.

What is a stacked area chart?
A stacked area chart plots several series on top of one another so each filled band sits above the one below it. The top edge traces the combined total over time, and the thickness of each band shows how much that series contributes to the whole. It answers two questions at once: how is the total changing, and how is the mix changing — for example total revenue over the year and each channel's share of it.
When should I use a stacked area chart?
Use it for part-to-whole relationships that change over time and where the running total is meaningful — revenue by channel, traffic by source, spend by platform. It shines when you care about both the total trend and the composition. Avoid it when you need to compare individual series precisely, because only the bottom band starts at the zero baseline; the rest float on shifting bases and are easy to misread.
Stacked area chart vs stacked bar chart — which should I use?
Both show part-to-whole composition. Use a stacked area chart when the x-axis is continuous (time) and you want to emphasize the flow of the total. Use a stacked bar chart when the x-axis is categorical or you have only a handful of discrete periods you want to compare directly. Area implies continuity; bars imply distinct buckets.
Why are the middle bands in my stacked area chart hard to read?
Because only the bottom series rests on the zero baseline — every band above it starts from the wavy top of the band below, so its apparent height is distorted by the series under it. Put the most stable or most important series at the bottom, keep the number of series to roughly 3–5, and if exact per-series values matter switch to small multiples or a line chart.
How many series can a stacked area chart handle?
Three to five is the practical sweet spot. Beyond that the bands get thin, colors blur together, and the baseline-shift problem makes the upper series unreadable. If you have many categories, group the long tail into an 'Other' band, use a treemap for a single point in time, or switch to a line chart for precise comparison.

Related Terms

Area Chart

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Stream Graph

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Data Visualization