Math

Pie Chart Maker

Create a pie chart instantly by entering labels and values. Supports donut mode, label format toggle, and PNG download.

Tips

  • Pie charts are best for showing proportions of a whole. They work well for questions like "what share of the budget does each category take?" or "what percentage of sales came from each product?"
  • Keep it to 5–7 slices or fewer for readability. If you have more categories, group smaller ones into an "Other" slice or consider switching to a bar chart.
  • Donut style leaves a blank center where you can add a title or total figure — useful when inserting the chart into presentations.
  • Click the camera icon in the top-right of the chart to download a PNG image you can paste directly into reports or slides.
  • Values can be absolute or relative — dollars, units sold, or percentages all work. The chart normalises whatever you enter, so the total does not need to equal 100.

Frequently Asked Questions

Yes. Decimal numbers like 1.5 or 0.75 are fully supported. The chart recalculates percentages automatically.

The limit is 20 items. Beyond that, pie charts become too cluttered to read. Consider grouping smaller slices into "Other" or switching to a horizontal bar chart for many categories.

Not yet — the chart uses ECharts' default colour palette automatically. Custom colour support is planned for a future update.

They convey the same information — the only difference is the hole in the centre. The donut style lets you place a total or title in the middle, which can look cleaner in slide decks.

Click "Save as image" to download a PNG, then paste it into your document. For editable charts in Excel, you'll get better results using Excel's built-in chart tools — but the PNG works well for reports and presentations.
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Side Note — Why do experts dislike pie charts?

In data visualisation circles, pie charts are often criticised for being hard to read accurately. Humans are better at comparing lengths than areas, so two similar slices (e.g. 28% and 32%) look nearly identical in a pie chart, while the difference is immediately obvious in a bar chart.

3D pie charts are even more problematic — the perspective distortion systematically makes near slices look larger than far ones. Edward Tufte's influential 1983 book The Visual Display of Quantitative Information coined the "data-ink ratio" concept and used pie charts as an example of low-information-density design.

That said, pie charts do shine in a few scenarios: showing whether something exceeds 50% (majority rule), or communicating a rough breakdown to a non-technical audience when precision is less important than quick comprehension. The key is matching the chart type to the story you're trying to tell.

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