Turn a list of values into pie-chart slices with percentages and angles, drawn on a canvas in the browser.
Total
How to use this tool
Enter the values separated by commas.
Optionally enter matching labels, also comma separated.
Read each slice’s percentage and start/end angles.
View the drawn chart below the results in the browser.
Formula & worked example
Values 30, 50, 20 give slices of 30%, 50% and 20%, with angles of 108°, 180° and 72°.
Limitations — read this before you rely on it
Values must be zero or positive and sum to more than zero; pie charts are a poor choice when values are very many or nearly equal in a way that needs precise comparison.
Frequently asked questions
As many as you list, but charts with more than about eight slices get hard to read; consider grouping small values.
If you give fewer labels than values, the rest are named Slice 4, Slice 5 and so on.
Yes. Values may be decimals; only the proportions matter.
Because every slice shares one total, so percentages always add to 100% and angles to 360°.
The chart is drawn on a canvas in your browser; take a screenshot or use your browser’s save-image option on the canvas.