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Quick answers
When should I pick Bar chart?
When the story is: comparing a handful of categories at one time.
When should I avoid Bar chart?
Skip it in cases like: too many categories, 3-D extrusion, or dual-axis tricks.
Who invented or popularised it?
William Playfair, Commercial and Political Atlas, 1786
What does it encode?
length of rectangles on one baseline
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.
Bar chart encodes values as length of rectangles on one baseline. William Playfair, Commercial and Political Atlas, 1786.
In reports, ads and assignments it fits comparing a handful of categories at one time. Skip it when too many categories, 3-D extrusion, or dual-axis tricks.
Use when
- Use when 1 — Use Bar chart when the story is comparing a handful of categories at one time.
- Use when 2 — Build the first draft in Excel or Google Sheets, then restyle — do not screenshot.
- Use when 3 — In PowerPoint, one Bar chart 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 Bar chart in cases like: too many categories, 3-D extrusion, or dual-axis tricks.
- 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
Bar chart: honour length of rectangles on one baseline, and switch when too many categories, 3-D extrusion, or dual-axis tricks.