Pie Chart Maker — Proportional Part-to-Whole Sector Generator
A pie chart divides a $360^\circ$ circular disc into radial sectors whose central angles ($\theta_i = 360^\circ \times x_i / \sum X$) and arc lengths are strictly proportional to each category's share of the total.
Tip: Paste Excel or Google Sheets rows (Ctrl+V / ⌘V) directly into any cell.
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Sector angle in radians: theta_i = 2 * pi * (x_i / sum(X)). Sector percentage: pct_i = (x_i / sum(X)) * 100%. SVG arc endpoint: (cx + r * cos(theta), cy + r * sin(theta)).
Chart Design & Use-Case Tips
- 01Sector angle in radians: theta_i = 2 * pi * (x_i / sum(X)). Sector percentage: pct_i = (x_i / sum(X)) * 100%. SVG arc endpoint: (cx + r * cos(theta), cy + r * sin(theta)).
- 02Restrict pie charts to 4–6 slices maximum; combine tiny categories (< 3%) into an 'Other' slice for clean readability.
- 03Ensure all slice values are strictly positive numbers that represent mutually exclusive parts of a single meaningful whole.
- 04Use the data labels toggle to display exact percentage shares alongside each slice.
Frequently Asked Questions
Do my input numbers have to add up to 100?+
No. Enter raw counts, dollars, or hours in Series A, and the Pie Chart Maker automatically normalizes every slice against the sum total to compute exact percentages and angles.
When should I use a donut chart or stacked bar instead of a pie chart?+
Use a donut chart when you want a central total readout, and use a stacked or horizontal bar chart when you have more than 6 categories or subtle 1–2% differences.
Can Pie Chart Maker handle negative values?+
Pie charts represent non-negative parts of a whole, so negative numbers are clamped at zero; for positive and negative contributions, use the Waterfall Chart Maker.