Statistics & Probability

Instant, private, and free

Pie Chart Calculator.

Convert category values to percentages and sector angles.

On-device calculationNo signup
01

Set your values

Results update as you type.

total: 100

total

100.000000
percentages: 25, 35, 40

percentages

25, 35, 40
angles: 90, 126, 144

angles

90, 126, 144

Results update automatically as you type.

Use Cases

Visualize survey responses

Quickly convert response counts into percentages and angles to create an accurate pie chart for reports or presentations.

Example: If 50 out of 200 respondents chose 'Yes', that's 25% and a 90° sector.

Budget allocation breakdown

See how each expense category compares to the total budget in both percentage and angle form.

Example: Rent $1000, Food $500, Other $500 → Rent 50%, 180°.

Frequently Asked Questions

How does the Pie Chart Calculator work?
Enter your category values, and the calculator sums them to find the total. Each category's percentage is its value divided by the total, multiplied by 100. The sector angle is that percentage multiplied by 3.6 (since a full circle has 360 degrees).
What units are used for the sector angles?
Sector angles are given in degrees. Each category's angle is proportional to its share of the total, so all angles add up to 360 degrees.
Can I use this calculator for any type of data?
Yes, as long as your data consists of positive numeric category values. It's ideal for survey results, budget breakdowns, or any part-to-whole comparison.

Tips & Common Mistakes

Tips

  • Ensure all category values are positive numbers; zero or negative values may distort the chart.
  • Double-check that your category values are in the same unit (e.g., all dollars or all counts) for accurate percentages.
  • Use the calculated angles to draw your pie chart with a protractor or in software like Excel or Google Sheets.
  • If you have many categories, consider grouping smaller ones into an 'Other' category to keep the chart readable.

Common Mistakes to Avoid

  • Entering percentages instead of raw values – the calculator expects actual counts or amounts, not percentages.
  • Forgetting to include all categories – the total must represent the whole data set for accurate proportions.
  • Using negative numbers or zeros, which can lead to misleading sector angles or division by zero.

Last updated: August 13, 2026