A pie chart is a circle divided into slices where each slice represents one category's share of a whole. The angle of each slice is proportional to that category's percentage of the total.
To visualize your own part-to-whole data, paste category labels and values into the free pie chart maker.
The core idea
Draw a circle. Divide it according to how much each category contributes to 100%. A category with 50% gets half the circle; a category with 25% gets a quarter. The whole circle always equals the total — 100% — and every slice is one piece of that total.
This makes pie charts inherently a part-to-whole chart. They answer: "What fraction of the total does each category represent?"
Pie chart anatomy
- Slice — one wedge representing one category. Its arc length and central angle both correspond to the category's percentage.
- Label — the category name, sometimes placed inside the slice, sometimes outside with a leader line.
- Percentage — often printed inside or near each slice; calculated automatically from the raw values.
- Legend — a key matching colors to category names when labels can't fit on the slices.
Donut chart: pie chart with a hole
A donut chart is identical to a pie chart except the center is cut out. The hole typically displays a summary statistic (total, percentage, label). Visually, donut charts are often preferred because:
- The center hole can carry useful text
- The eye focuses on arc length rather than wedge area, which some research suggests is slightly more accurate to read
- They look cleaner in modern dashboards
The trade-off: the missing center reduces the visual sense of "wholeness" that makes pie charts intuitive.
When pie charts work
- 2–5 categories — slices are distinct and easy to compare. More than 5–6 slices creates thin wedges that are nearly impossible to compare visually.
- Large percentage differences — a 50% slice vs a 10% slice is clear. A 22% vs 19% vs 18% comparison is not — use a bar chart instead.
- Part-to-whole is the point — when the audience needs to understand shares and proportions, not rank order or exact values.
When pie charts fail
| Problem | Better alternative |
|---|---|
| More than 6 categories | Horizontal bar chart |
| Categories with similar sizes | Bar chart (bar lengths are easier to compare than slice angles) |
| Showing change over time | Line chart or grouped bar chart |
| Comparing across two groups | Side-by-side bar charts |
| Exact values matter | Bar chart with value labels |
The human eye reads lengths (bar heights) more accurately than angles (pie slices). If ranking or comparing values matters more than showing proportions, bar charts almost always communicate more clearly.
When to use a pie chart
- Showing market share across 3–4 major players
- Visualizing budget breakdown where part-to-whole is the message
- Survey results like "What % prefer option A, B, or C?"
- Any scenario where the key message is "X accounts for more than half"
FAQ
Do pie chart values need to add up to 100%?
No — the chart calculates percentages from your raw values automatically. Enter actual counts, dollar amounts, or any unit. The chart divides each value by the total to get the percentage for each slice.
How many slices should a pie chart have?
2–5 slices is the practical limit for clear communication. With 6+ slices, consider grouping the smallest ones into an "Other" category. Pie charts with 10+ slices are almost always better served by a bar chart.
What is an exploded pie chart?
An exploded pie chart pulls one or more slices slightly away from the center to emphasize them. It's useful for highlighting a specific category but can distort proportions if overdone — the gap makes the emphasized slice look larger than it is.
References
How this guide is reviewed
This guide is maintained by the ChartsMakers Editorial Team and reviewed for statistical accuracy, product behavior, and clarity. Sources used for factual checks are listed in the References section. See our editorial policy.