Pie Chart Calculator
Enter categories and amounts to compute relative percentages, angle measures, and data summaries for pie charts.
Total: 100
| Category | Value | % of Total | Angle (degrees) |
|---|---|---|---|
| Marketing | 45 | 45.00% | 162.0° |
| R&D | 30 | 30.00% | 108.0° |
| Operations | 15 | 15.00% | 54.0° |
| Other | 10 | 10.00% | 36.0° |
How to Use This Calculator
- List each category on its own line using “Label: value”.
- Confirm that values reflect totals (e.g., dollars, counts, minutes).
- Review percentages and angles to build your pie chart accurately.
- Double-check that all percentages add to approximately 100% (minor rounding is expected).
Formula
Percentagei = (Valuei / Σ Value) × 100%
Anglei = Percentagei × 360° / 100
These formulas convert absolute quantities into relative proportions suitable for pie chart visualization.
Full Description
Pie charts display parts of a whole using sectors, where each wedge's angle is proportional to its share of the total. This calculator transforms raw amounts into percentages and angles, simplifying chart creation in spreadsheets, presentation software, or by hand. It is especially helpful when the dataset has a manageable number of categories and the values sum to a meaningful total.
To keep pie charts legible, limit slices to a reasonable number and group very small categories into an “Other” slice. Ensure labels and percentages are clear so viewers can quickly grasp the distribution.
Frequently Asked Questions
Do percentages always add to 100%?
Yes, up to rounding error. Minor discrepancies (±0.01%) stem from formatting.
How many categories should I include?
Keep the number of slices manageable (ideally fewer than 8) for clarity.
Can I use decimals?
Absolutely. The tool works with integers, decimals, or currency values.
How do I show small values?
Combine tiny slices into an “Other” category to keep the chart readable.