Pie charts rarely convey information effectively; we find their ubiquitous presence in reports troubling and unnecessary.
The Problem with Pies
We see pie charts everywhere. From executive summaries to detailed analyses, they persist. Our data shows a clear pattern: most pie charts are visual clutter.
Humans are not good at comparing angles or areas. When you present slices of a pie, the audience struggles to accurately gauge their relative sizes, especially with more than two categories.
Consider a pie chart with three slices: 30%, 35%, and 35%. Can you quickly tell the difference between the two larger slices? Most people cannot. This forces the viewer to read the exact percentages, negating the visual's purpose.
The primary goal of a chart is to make data interpretation faster and more intuitive. Pie charts fail this test repeatedly.
When They 'Work'
We sometimes encounter arguments for pie charts when a single category dominates. For instance, if one slice is 90% and the rest are tiny. Even then, a simple sentence stating, 'Category A accounts for 90% of the total' is often clearer and more direct.
Another common justification is showing 'parts of a whole'. This is true for any chart depicting proportions. The 'parts of a whole' argument does not automatically make a pie chart the best choice.
Even in these 'best-case' scenarios, the chart adds little value beyond direct text or a more effective visualization.
Better Alternatives
We have several reliable alternatives that perform better than pie charts in almost every situation. Our advice is simple: switch to these.
- **Bar Charts:** These are excellent for comparing discrete categories. They allow for easy visual comparison of lengths, which humans process efficiently. Order them by size for maximum impact.
- **Stacked Bar Charts:** If showing 'parts of a whole' is truly critical and there are few categories, a stacked bar can work. However, we often find simple bar charts comparing totals and then individual segments more effective.
- **Plain Text:** For very few categories or simple dominance, a concise sentence is frequently the most impactful way to convey the message. Do not underestimate the power of direct prose.
Our Recommendation
Our guidance is straightforward: avoid pie charts. They are a relic of less sophisticated data visualization and rarely serve your audience well. Prioritize clarity and ease of interpretation.
We advocate for visuals that require minimal mental effort from the audience to extract insights. Pie charts typically demand more effort for less return. Let's make reporting more effective, not just decorative.
Want this kind of clarity on your own reports?
We rebuild executive packs and dashboards for a living. Send us what you've got. We'll tell you, honestly, what we'd change.