Pie chart maker
Type a label and a number on each line. The tool adds them up, draws every slice in proportion to its share of the total and lists the percentages in a table. Switch the percentage labels on or off and download the chart as a PNG. Nothing is uploaded.
Runs in your browser: nothing you enter is sent anywhere.
How to use it
- Type or paste your data, one slice per line: a label, then a number.
- Add a title and choose whether percentages appear on the slices.
- Check the table under the chart, then press Download PNG.
How it works
The tool adds all values to get the total. A slice’s share is its value divided by the total, and its angle is that share times 360 degrees. Slices start at 12 o’clock and run clockwise in the order you typed them. Percentages are written on slices that take at least 5% of the circle; smaller ones are still in the legend and the table.
Worked example
The default data is Maths 6, Science 4, History 3, Art 2 and Sport 5. The total is 20, so the shares are 30%, 20%, 15%, 10% and 25%, which add up to 100%.
Tips
- Use a pie chart for parts of one whole; for comparing separate amounts, a bar chart reads more easily.
- Keep to about six slices; many thin slices are hard to compare.
- Type the slices in the order you want them to appear around the circle.
Frequently asked questions
How are the percentages worked out?
Each value is divided by the total of all values and multiplied by 100. The slice angle is the same share of 360 degrees. With values 6, 4, 3, 2 and 5 the total is 20, so the 6 is 30% and spans 108 degrees.
Do the values have to add up to 100?
No. Enter any amounts, such as votes, hours or money; the tool finds the total itself. If your numbers already are percentages that add to 100, they are shown unchanged.
Why do the rounded percentages not always add to 100?
Percentages are rounded to one decimal place, so a few rounded shares can add to 99.9 or 100.1. The slices themselves are drawn from the exact values.
What happens to zero values?
A zero keeps its row in the table with 0% but has no slice in the picture. If every value is zero the tool tells you, because there is nothing to divide.
How do I save the chart?
Press Download PNG. The image has a white background and is drawn at twice the on-screen size. It is made in your browser and never uploaded.