Chart type · Comparison
Treemap
How to read it
Area is the value. Rectangles are laid out largest first, usually from the top-left corner. In a morph, compare the start and the end — the areas in between are only the move. In a sector map, a part's area is its share of the whole, and colour (green up, red down) is the change, not the size.
Best for
Market share and revenue mix, especially with a long tail of small parts, or any "who gained share" story.
When not to use it
Precision matters — people compare areas badly, especially between rectangles of different proportions. Sector headers also take a fixed strip, so areas are only proportional across sectors to within that strip.
The common mistake
Comparing a tall thin block with a wide flat one. Equal areas in different shapes rarely look equal.
Example data
Who actually owns the smartphone market?
Global shipment share, latest quarter
The sample dataset this format ships with, drawn the way the site draws every clip's numbers — hover, sort or step through it. Figures as given by its source line: Illustrative example data.
Examples
No treemap videos published yet. Browse the rest of the library.
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