Create pie charts with automatic percentage calculations. Enter raw numbers and see instant percentage breakdowns. Free online tool — no signup required.
Divide each slice's value by the total of all values, then multiply by 100. That is the slice's percentage. Multiply the percentage by 3.6 to get the slice's angle in degrees, because a full circle is 360 degrees and 360 ÷ 100 = 3.6.
Percentage = value ÷ total × 100
Angle = percentage × 3.6 (or value ÷ total × 360)
Worked example: a $3,000 monthly budget
| Category | Value | Percentage | Angle |
|---|---|---|---|
| Rent | $1,200 | 40% | 144° |
| Food | $750 | 25% | 90° |
| Savings | $600 | 20% | 72° |
| Transport | $450 | 15% | 54° |
| Total | $3,000 | 100% | 360° |
Check your work: the percentages should add up to 100 and the angles to 360. A total of 99.9 or 100.1 comes from rounding, not a mistake. Three equal slices are each 33.3% on a label but 33.33...% in the math.
To go the other way, turn a percentage back into a value with percentage ÷ 100 × total. In the budget above, 25% of $3,000 is $750.
The chart above does the percentage step for you: enter the raw numbers and each slice is labeled with its share of the total. The angle matters when you draw a pie chart by hand with a protractor, or when a class assignment asks you to show the working.
Percentages make proportional data instantly understandable. Readers can grasp the relative size of each category without doing mental math.
Enter raw numbers — percentages appear instantly
Readers understand proportions at a glance
Perfect for business reports and presentations
Clean formatting with proper rounding
Type raw numbers — no need to calculate percentages
Percentages print on each slice (on by default)
Adjust colors, label positions, and decimal places
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