A pie chart maker with percentages saves you the step most people get wrong: turning raw counts into shares of a whole. Type the numbers as you have them, and every slice shows its percent of the total, rounded to one decimal.
The example above uses a small customer survey: 120 people answered “How did you hear about us?”. Nobody has to work out that 46 answers is 38.3% of 120; the chart does it, and the table under it shows the percent and the degrees for each slice.
How does the maker turn numbers into percentages?
Every slice follows the same two-step formula:
- Add up all the values. In the example: 46 + 31 + 27 + 12 + 4 = 120.
- Divide each value by the total and multiply by 100. Google search: 46 ÷ 120 × 100 = 38.3%.
| Answer | Count | Percent |
|---|---|---|
| Google search | 46 | 38.3% |
| 31 | 25.8% | |
| Friend or colleague | 27 | 22.5% |
| Newsletter | 12 | 10% |
| Other | 4 | 3.3% |
| Total | 120 | 99.9% |
That last line is not a mistake. Each percentage is rounded separately, so the printed labels can add up to 99.9% or 100.1% while the slices themselves fill exactly 360 degrees.
How do you make percentages add up to exactly 100?
Readers notice when a chart’s labels add up to 99.9%, and teachers mark it. The fix that statisticians use is the largest remainder method:
- Round every percentage down to a whole number: 38, 25, 22, 10 and 3. That makes 98.
- Find the 2 missing points and give them, one each, to the slices with the largest decimal remainders: Instagram (.83) and Friend or colleague (.5).
- Result: 38%, 26%, 23%, 10%, 3% = 100%.
Type those whole numbers into the maker as values and the labels will read exactly 100 between them.
Which label style should you choose?
- Percent for most charts. It answers the question a pie chart is built for: how big is each part of the whole?
- Value and percent when the total matters too, as in survey results (“46 answers, 38.3%”) or a budget (“€1,200, 46%”).
- Name and percent for charts that will be shown without a legend, like a thumbnail or a social post. Names only appear on slices big enough to hold them.
- Value when your numbers are already percentages from a report and you want them printed exactly as published.
What do people get wrong with percentage pie charts?
- Mixing totals. All slices must come from the same whole. “38% of customers” and “25% of revenue” can’t share a pie.
- Multiple-choice answers. When people can pick more than one answer, the percentages add up to more than 100% and a pie chart misleads. Use a bar chart for those questions.
- Too many thin slices. Anything under about 3% is hard to see. Group the small answers into “Other” and mention them in the text.
- Hiding the sample size. “38% of customers” from 12 answers means something else than from 1,200. Put the count in the title, as in the example.
Where can you go from here?
Want the counts on the slices instead? The pie chart with numbers shows values, or values and percentages together. Need one single share, like 35% of a circle? The percentage pie chart has a slider. Drawing a pie chart by hand for homework? The pie chart calculator gives the degrees for your protractor. Working inside a spreadsheet? Follow the guide for Excel or Google Sheets, or paste your two columns straight into the pie chart generator.
This maker is part of a free toolkit from Fe/male Switch, the startup game for women founders. Survey results like the example above are the first data most founders chart, for a customer interview summary or a pitch deck.
Published 26 October 2026 · by the Fe/male Switch team