Circle Chart Maker

Turn values into fraction shares, percentages, and 360° sectors for a classroom-ready circle graph. Edit the parts and see every conversion instantly.

Education and math tool

Divide a circle into sectors

Data stays in your browser

1. Enter parts of the whole

Paste parts and values

Use one part and one non-negative value per row.

Editable chart data
#	Part	Value
1	Part, row 1	Value, row 1
2	Part, row 2	Value, row 2
3	Part, row 3	Value, row 3
4	Part, row 4	Value, row 4

2. Choose what the sectors show

Circle graph title

Part labelsPercentagesDegreesLegend

Circle graph

4 parts · total 8 · 360°

Sector calculations

Values converted into shares, percentages, and angles for the circle graph
Part	Value	Share of total	Percentage	Angle
Reading	3	3 out of 8	37.5%	135°
Sports	2	2 out of 8	25%	90°
Gaming	1	1 out of 8	12.5%	45°
Other	2	2 out of 8	25%	90°
Whole	8	All parts	100%	360°

Quick guide

How to make a circle graph

List the parts. Enter each category and its value, or paste two spreadsheet columns.
Check the whole. The values must be non-negative and add to more than zero.
Read the conversions. Compare each value’s share, percentage, and sector angle in the table.
Use the result. Choose the labels your lesson needs and download the PNG.

What is a circle graph?

A circle graph divides one complete circle into sectors that represent parts of a whole. A larger share receives a larger sector. Because the whole circle represents 100%, all sector angles together equal 360°.

From values to percentages and degrees

First add the values to find the total. Divide one value by that total to find its fractional share. Multiply the share by 100 for a percentage, or by 360 for its central angle. The tool performs both conversions without requiring values to add to 100.

Worked example

3 out of 8

Share: 3 ÷ 8 = 0.375
Percentage: 0.375 × 100 = 37.5%
Angle: 0.375 × 360° = 135°

The default Reading sector demonstrates all three representations of the same part.

Fractions and parts of a whole

A value does not need to be written as a fraction before you enter it. If the values are 3, 2, 1, and 2, their total is 8. The first part is therefore 3 out of 8, or 3/8 of the whole. Decimal inputs work the same way because the share is always calculated from the actual total.

Circle graph vs pie chart

Use a circle graph for learning

Show how fractions, percentages, and central angles describe the same parts of a whole.

Use a pie chart for presentation

Communicate a small set of category shares without emphasizing the angle calculations.

Use bars for exact comparison

Choose a bar graph when close values or many categories need to be compared precisely.

Circle chart maker FAQ

How do I convert a value into a circle-graph angle?

Divide the value by the total of all parts, then multiply by 360 degrees. For example, 3 out of 8 is 3 ÷ 8 × 360 = 135 degrees.

Why does a full circle equal 360 degrees?

A complete turn around the center of a circle is defined as 360 degrees. Sector angles therefore add to 360 degrees when all parts of the whole are included.

Can a circle graph include a zero-value part?

Yes. It remains in the calculation table as 0%, or 0 degrees, but it does not occupy a visible sector in the circle.

What is the difference between this and the Pie Chart Maker?

This tool teaches parts of a whole by showing fractions, percentages, and angles. The Pie Chart Maker is aimed at general category-share visualization and simpler presentation controls.

Is my classroom data uploaded?

No. The values, calculations, rendering, and PNG export all stay in your browser.