Pie Chart Percentage Calculator
Enter category labels and values to convert them into percentages that sum to 100%, ready for pie chart visualization.
Example: Marketing 30
| Label | Value | Percentage |
|---|---|---|
| Marketing | 30 | 30.00% |
| Sales | 45 | 45.00% |
| Support | 25 | 25.00% |
Total value: 100
How to Use This Calculator
- Enter each pie slice with label and numeric value.
- Ensure values are non-negative numbers (zeros are permitted).
- Review the calculated percentages that add up to 100%.
- Use the output to draw accurate pie charts or feed into visualization software.
Formula
Percentage = (slice value / total value) × 100%
Total value = Σ slice values
Percentages are rounded to two decimals; rounding may cause slight sum deviations.
Full Description
Pie charts illustrate parts of a whole. This calculator converts raw data into percentage shares, streamlining the process for presentations, reports, and infographics without manual arithmetic.
Frequently Asked Questions
Do percentages always sum to 100%?
Yes, except for small rounding differences displayed (e.g., 99.99%).
Can I input decimals?
Absolutely. Values can be integers or decimals—units are arbitrary.
What if a category has zero value?
It contributes 0% to the pie chart and can be omitted visually if desired.
How can I use these percentages?
Apply them directly to draw pie charts, annotate slices, or feed into spreadsheet charting tools.