Pie charts and bar charts both display categorical data. But they answer different questions — and one is almost always a better choice than the other.
When your categories form a meaningful whole, use the free pie chart maker to calculate percentages and label each slice.
Key difference
| Pie chart | Bar chart | |
|---|---|---|
| Question answered | "What share does each category represent?" | "How do these categories compare in value?" |
| Best for | Part-to-whole relationships | Rankings, comparisons, changes over time |
| Number of categories | 2–5 | 2–20+ |
| Requires zero baseline | No | Yes |
| Easy to compare similar values | No | Yes |
| Familiar to all audiences | Yes | Yes |
When to use a pie chart
A pie chart is for part-to-whole stories where the total equals 100% and category shares are the message.
- Market share: "Company A holds 52% of the market"
- Budget breakdown: "Salaries represent 60% of expenses"
- Survey responses where options are mutually exclusive and exhaustive
- Any situation where one category is dominant and you want to show its dominance visually
Pie charts work when there are 2–5 categories and the differences between slices are large enough to see.
When to use a bar chart
A bar chart is for comparing values across categories — ranking, contrasting, or showing change.
- Comparing sales figures across 10 products
- Ranking countries by population
- Showing year-over-year revenue by product line
- Any situation where you want to ask "which is higher?" or "how much higher?"
Bar charts work for any number of categories. A horizontal bar chart is especially effective for 10+ categories with long labels.
Why bar charts usually win for comparison
The human eye is better at comparing bar lengths than pie slice angles. Research (including Cleveland & McGill's 1984 paper that introduced the dot plot) shows that people judge positions and lengths more accurately than areas and angles. For the same data, a bar chart produces more accurate comparisons.
Example: if two slices are 22% and 19%, they're nearly indistinguishable in a pie chart. On a bar chart, the difference is immediately visible.
The one case where pie charts are genuinely better
When the message is "one category accounts for more than half" or "one category dominates overwhelmingly," a pie chart makes this easy to see quickly. A single large slice that clearly exceeds the midpoint of the circle communicates dominance more directly than a bar chart.
When neither is ideal
| Situation | Better chart |
|---|---|
| More than 6–8 categories | Horizontal bar chart with sorted bars |
| Showing change over time | Line chart |
| Comparing two values per category | Dumbbell/Cleveland dot plot |
| Showing distribution of values | Histogram or box plot |
FAQ
Can I use a pie chart with more than 6 slices?
Technically yes, but practically no. Beyond 5–6 slices, the thin wedges become impossible to compare, and the chart stops communicating. Group the smallest slices into an "Other" category, or switch to a bar chart.
Should a pie chart always add up to 100%?
Yes — the whole circle represents the total. If your categories don't account for all possible values (e.g., you're only showing the top 3 of 10 options), either add an "Other" slice to reach 100% or use a bar chart instead.
Is a donut chart better than a pie chart?
Donut charts and pie charts communicate the same information. Donut charts are slightly easier to read because the eye focuses on arc length rather than wedge area. They also allow a summary stat in the center. The choice between them is mostly aesthetic.
How this guide is reviewed
This guide is maintained by the ChartsMakers Editorial Team and reviewed for statistical accuracy, product behavior, and clarity. When a guide relies on software behavior or statistical definitions, we check it against official documentation or established references. See our editorial policy.