🎓 Graphing & Visualization • Categorical & Presentation Charts
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Interactive Pie & Donut Chart Generator
Generates proportional SVG pie and donut charts with slice angles, percentages, and custom color palettes.
Categories & Metrics (String Buffered):Total: 110
Presets:
Total Sum110Top: Mathematics
Distribution Legend:
Mathematics
3531.8%
Physics
2522.7%
Computer Science
3027.3%
Chemistry
2018.2%
Total: 110Categories: 4Mean: 27.5Max: 35
What is a Pie Chart?
A pie chart is a circular statistical graphic divided into slices to illustrate numerical proportions, where the arc length of each slice is proportional to the quantity it represents.
Formula & Step-by-Step Calculation
Slice Angle θ = (Value_i / Total Value) × 360°, Percentage % = (Value_i / Total) × 100%
Circular proportionality.
Worked Step-by-Step Examples
Example 1
Categories: Math (35), Physics (25), Chemistry (20), CS (30)
Solution: Total = 110; Math = 31.8%, Physics = 22.7%, Chemistry = 18.2%, CS = 27.3%
• Total = 110; Math fraction = 35/110 = 31.8%
Common Real-World & Academic Use Cases
- ✓ Budget expenditure allocation visualization
- ✓ Market share breakdowns in business presentations
- ✓ Survey response demographic proportions
How to Use the Interactive Pie & Donut Chart Generator
1
Add Slices
Enter category labels and values.
2
Customize Colors
Choose colors for each slice.
3
View Chart
Review proportional slices and percentage legend.
Frequently Asked Questions
Q: When should I avoid using a pie chart?
When you have more than 7 categories or when slice values are very similar, as human eyes struggle to compare subtle angle differences.