General plots / Pie and donut chart
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Each slice’s angle (area) is proportional to its share of the total; a donut shows the total in the centre. With several value columns, small pies are drawn side by side with consistent category colours.
Angles are compared less accurately than lengths: with more than 6–8 categories or similar shares, a stacked or ordinary bar chart shows differences more clearly.
Very small categories are merged into “Other” by default (threshold adjustable); the downloadable table keeps every category’s value and percentage before merging.
A pie shows composition, not totals; compare totals between pies using the summary.
Percentage = category value / column total × 100; negative values are ignored.
Up to 24 pies.
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