Pie charts display data as proportional slices of a circle, making it easy to see how parts contribute to a whole. They are ideal for showing market share, budget allocation, survey demographics, and any composition data. viz42 generates properly proportioned pie charts with labels and percentages from simple text descriptions of your data.
Pie charts work best with 3-7 slices. For more categories, consider grouping smaller ones into an 'Other' slice, or use a bar chart instead.
Mermaid's native pie chart renders as a standard pie. After export, you can modify the SVG to add a center cutout for a donut style.
Use pie charts when showing parts of a whole (percentages that add to 100%). Use bar charts when comparing absolute values or when you have many categories.