Enter your data groups and their values to see each segment's percentage and degree angle for a pie chart. Add up to 8 named categories — the calculator divides each value by the total and shows you the percentage share and slice angle for every group, plus a live pie chart preview.
Total (Sum of All Values)
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Largest Slice (%)
Largest Slice (Degrees)
Active Groups
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Divide each group's value by the total sum of all values, then multiply by 100. For example, if a group has a value of 25 and the total is 100, its pie chart percentage is (25 ÷ 100) × 100 = 25%. This calculator does this automatically for each group you enter.
Each slice's angle in degrees equals (group value ÷ total value) × 360. A full circle is 360°, so each slice takes up a proportional share of that. For example, a group representing 25% of the total has a slice angle of 0.25 × 360 = 90°.
A pie chart is used to show how a whole dataset is divided into parts. It makes it easy to compare the relative proportions of each category at a glance. Pie charts work best when you have a small number of categories (typically 2–8) and want to highlight part-to-whole relationships.
To make a pie chart, list all your categories and their corresponding values. Calculate the total sum of all values, then find each category's percentage and degree angle. Plot each slice using those angles around a circle. This calculator automates all of those steps and shows you the result visually.
A 75-25 pie chart is a pie chart with two segments — one representing 75% of the data (270°) and the other representing 25% (90°). It's commonly used to visualize situations like a 3-to-1 ratio or a majority vs. minority split.
15 percent in a pie chart corresponds to a slice angle of 0.15 × 360 = 54°. That means the slice occupies 54 degrees out of the full 360-degree circle.
45% in a pie chart corresponds to a slice angle of 0.45 × 360 = 162°. This slice takes up nearly half the pie, representing just under half of the total data.
The probability of a random data point falling in a given category equals that category's percentage divided by 100 (i.e., its decimal proportion). For example, if a slice represents 30% of the pie chart, the probability of selecting a value from that category at random is 0.30, or 30%.