Visualize proportions and percentages dynamically. Create interactive pie charts to show part-to-whole relationships in your data.
Last updated: March 2026
A pie chart is a circular statistical graphic divided into slices to illustrate numerical proportions. Each slice represents a category's percentage of the whole, making it ideal for showing compositions and part-to-whole relationships. The full circle equals 360° or 100%.
Each slice occupies an angle proportional to its percentage: a category representing 50% of the total spans 180° (half the circle), 25% spans 90° (quarter circle), and so on. The formula is: slice angle = (value / total) × 360°. This makes it easy to visually compare relative sizes at a glance.
Pie charts work best with 2-5 categories. Beyond 6-8 slices, the human eye struggles to differentiate angles and compare sizes accurately. For many categories, consider using a bar chart or table instead. Always ensure colors are distinct and accessible (consider color-blind viewers).
Monthly Budget Breakdown
Housing dominates the budget at 60% (more than half the circle), while entertainment is minimal at 5% (a small sliver). Food and transport make up the remaining 35%. Visual comparison shows housing is 12× larger than entertainment.
Circular graph divided into slices proportional to data categories. Each slice = category percentage of whole. Visual: 360° = 100%, so slice angle = percentage × 3.6°. Effective for compositions and part-to-whole relationships.
Best for: Few categories (2-5), comparing parts to whole. Examples: budget breakdown, sales by region, survey responses. Avoid: >6 categories (hard to compare), trends over time (line chart better), small differences.
Relative to full circle (360°). Eye-ball: Does it occupy ~¼ of pie? ≈25%. More precise: Check breakdown table showing exact %. Our tool displays percentages next to each slice for accuracy.
Both show same data. Pie: filled circle. Donut: hollow center (can label category there). Donut advantage: center space for title/total. Pie: cleaner, easier to compare visually. Choose based on preference and space.
Pie charts auto-calculate! Enter any units (dollars, hours, votes, counts). Calculator converts to percentages: [10, 20, 30] → 16.7%, 33.3%, 50%. Total always = 100%.
NO! 3D perspective distorts perception—front slices appear larger, back smaller than they are. 2D allows accurate visual comparison. Scientific recommendation: always use 2D for data integrity. 3D only for aesthetic presentations where accuracy matters less.
Use distinct, high-contrast colors. Consider color-blind accessibility (avoid red-green alone). Color psychology: red=danger/loss, green=positive/profit, blue=neutral. Our tool auto-assigns varied hues for maximum distinction.
Effectively 2-5 ideal, 6-8 maximum. Beyond 8, human eye struggles to differentiate angles. Too many tiny slivers → consider bar chart or table. Use 'Other' category to consolidate small slices: 'Other: 12%' instead of many 1-2% slivers.
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