JLJosh Liljenquist

Data visualization utility

Pie chart maker

Turn category labels and nonnegative values into a local SVG pie chart. Add or remove rows, inspect the total and percentages, and use the accessible text table instead of relying on color alone.

By

Local SVG renderingAccessible data tableAdd or remove rows

Enter known values

Enter the known values and select Calculate.

How to use this calculator

  1. Enter a meaningful label and nonnegative value for each category.
  2. Add or remove rows as needed while keeping at least two categories.
  3. Generate the chart and confirm the displayed total.
  4. Use the textual category table for exact values and percentages.

Formula and method

Category percentage = category value ÷ total of all positive values × 100. Each SVG slice uses the same proportion of the full 360-degree circle.

Worked example

Values 50, 30, and 20 total 100 and create slices of 50%, 30%, and 20%. The chart and text table present the same information.

Assumptions and result interpretation

  • At least one category must have a value greater than zero.
  • Zero-value categories are retained in the text output but have no visible slice.
  • The browser renders the chart locally; labels and values are not sent anywhere.
  • Percentages may display small rounding differences while the underlying proportions total 100%.

Understanding the result

Pie charts work best for a modest number of mutually exclusive parts of one total. The accompanying table preserves precise values and makes the result accessible without the graphic.

Common mistakes

  • Mixing counts and percentages in one dataset
  • Using negative values
  • Relying on color without reading the legend
  • Using a pie chart when categories overlap

Methodology note

The calculation follows the deterministic formula shown above and runs locally in the browser without a remote calculation service.

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This deterministic utility is a calculation aid. Confirm definitions, required precision, and any course, laboratory, professional, or policy requirements separately.