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Quick answers
When should I pick Treemap?
When the story is: part-to-whole with many leaves and a hierarchy.
When should I avoid Treemap?
Skip it in cases like: you need precise comparison of similar sizes.
Who invented or popularised it?
Ben Shneiderman, University of Maryland, 1991, for disk-space visualization
What does it encode?
area of nested rectangles for a hierarchy
Is it OK in ads?
Yes if one claim is visible at a glance in Meta, Google and retail print; otherwise link to a full figure.
Will a teacher accept it?
Yes for lab reports and poster boards if axes, units and a source line are present.
Treemap encodes values as area of nested rectangles for a hierarchy. Ben Shneiderman, University of Maryland, 1991, for disk-space visualization.
In reports, ads and assignments it fits part-to-whole with many leaves and a hierarchy. Skip it when you need precise comparison of similar sizes.
Use when
- Use when 1 — Use Treemap when the story is part-to-whole with many leaves and a hierarchy.
- Use when 2 — Build the first draft in Excel or Google Sheets, then restyle — do not screenshot.
- Use when 3 — In PowerPoint, one Treemap per slide, claim in the title.
- Use when 4 — For lab reports and poster boards, this form works when the question is comparison or process.
- Use when 5 — In Meta, Google and retail print, keep one number visible at thumbnail size.
Avoid when
- Avoid when 1 — Skip Treemap in cases like: you need precise comparison of similar sizes.
- Avoid when 2 — 3-D, dual axes, rainbow scales
- Avoid when 3 — Undated numbers, undated time series
- Avoid when 4 — Four charts on one slide
Audiences
- Work — PowerPoint
- Ads — Meta, Google and retail print
- School — lab reports and poster boards
Treemap: honour area of nested rectangles for a hierarchy, and switch when you need precise comparison of similar sizes.