A percentage pie chart shows one share of a whole: 35% of a goal reached, 15% of a class absent, three quarters of a budget spent. Move the slider or type the number, rename the two slices, and the chart is ready to download.
This page covers searches such as 35% pie chart and 15 percent pie chart. The answer to both is the same tool: a circle with one colored slice and the remaining share in a second color.
How do you turn a percentage into degrees?
A full circle has 360 degrees and a whole has 100%, so 1% equals 3.6 degrees. Multiply any percentage by 3.6:
- 15% × 3.6 = 54°
- 35% × 3.6 = 126°
- 62.5% × 3.6 = 225°
The table under the chart does this for you and adds the remainder: at 35%, the second slice is 65% and 234°.
Which percentages match common fractions?
| Fraction | Percent | Degrees |
|---|---|---|
| 1/10 | 10% | 36° |
| 1/8 | 12.5% | 45° |
| 1/6 | 16.7% | 60° |
| 1/5 | 20% | 72° |
| 1/4 | 25% | 90° |
| 1/3 | 33.3% | 120° |
| 3/8 | 37.5% | 135° |
| 1/2 | 50% | 180° |
| 2/3 | 66.7% | 240° |
| 3/4 | 75% | 270° |
The quick buttons above the slider cover the shares people ask for most. A third and two thirds are exact on the chart even though their labels round to one decimal.
When does a single-percentage pie work best?
- Progress toward a goal: 35% of a fundraising target, 70% of a course finished. Name the slices “Reached” and “Still to go”.
- One headline number in a report: “1 in 4 customers came back”. A pie at 25% makes the share visible at a glance.
- Fractions in class: show students that 3/8 and 37.5% fill the same slice.
For a single share, a donut reads even faster: tick Donut and the number sits in a clean ring. Data visualization designers use this format for dashboards because the eye compares the colored arc with the gray rest in one glance.
What mistakes should you avoid?
- Don’t round twice. If your source says 34.6%, enter 34.6, not 35. The slider moves in half steps, and the box takes any decimal.
- Don’t drop the remainder. A slice without its counterpart looks like a sector of nothing. Keep the “Rest” slice: the tool colors it light gray, so the share you care about stands out. Click its color square in the table to pick another color.
- Don’t show a share of different wholes. “35% of women and 20% of men” are two pies, not one.
How do you read a percentage pie chart at a glance?
Three reference shares make any single-slice chart easy to judge. 25% is a perfect quarter, with straight edges at 12 and 3 o’clock. 50% splits the circle with one straight line. 75% leaves an empty quarter. Every other share sits between these marks, so 35% reads as “a bit more than a quarter” and 15% as “a bit more than half of a quarter”.
That is also why single-share pies work in presentations: the audience estimates the number before you say it, and your label confirms it. Keep the label big (choose Percent under Slice labels), and keep the title short enough to read from the back of a room.
Where can you go next?
With several shares to show, switch to the pie chart maker with percentages, which turns any list of numbers into slices. For hand drawing, the pie chart calculator lists the degrees for every slice. And to let chance pick a share, the randomizer wheel makes random pie charts.
These tools are free from Fe/male Switch, the startup game where women build their first company. A progress pie like the one above also works on the last slide of a pitch deck, to show how much of a round is already committed.
Published 26 October 2026 · by the Fe/male Switch team