# Pie Chart Percentage Calculator Free pie chart calculator. Enter category values to compute percentages, degree angles for each slice, and identify the largest category. ## What this calculates Calculate the percentages and degree angles for each slice of a pie chart. Enter up to 8 category values and instantly see each category's share of the total, the angle of its pie slice, and which category is largest. ## Inputs - **Number of Categories** — min 2, max 8 — How many categories (2-8). - **Category 1 Value** — min 0 — Value for category 1. - **Category 2 Value** — min 0 — Value for category 2. - **Category 3 Value** — min 0 — Value for category 3. - **Category 4 Value** — min 0 — Value for category 4. - **Category 5 Value** — min 0 — Value for category 5. - **Category 6 Value** — min 0 — Value for category 6. - **Category 7 Value** — min 0 — Value for category 7. - **Category 8 Value** — min 0 — Value for category 8. ## Outputs - **Total** — Sum of all category values. - **Percentages** — formatted as text — Percentage of total for each category. - **Degrees** — formatted as text — Angle in degrees for each pie slice (out of 360). - **Largest Category** — formatted as text — The category with the highest value. ## Details A pie chart represents data as proportional slices of a circle. Each slice's angle is proportional to its share of the total: Degrees = (Value / Total) * 360. Similarly, each percentage is calculated as Percentage = (Value / Total) * 100. The slices must sum to 360 degrees (or 100%). Pie charts are best suited for showing the relative proportions of a small number of categories (ideally 2-6). When there are too many slices, especially small ones, the chart becomes difficult to read. In such cases, grouping small categories into an 'Other' category or using a bar chart instead may be more effective. When creating pie charts, start with the largest category at the 12 o'clock position and arrange slices clockwise in decreasing order. Use distinct colors for each category and label slices with both the category name and percentage. Avoid 3D effects, which distort the perceived size of slices. ## Frequently Asked Questions **Q: How do you calculate the angle for a pie chart slice?** A: Divide the category value by the total of all values, then multiply by 360 degrees. For example, if a category has value 25 out of a total of 100, its angle is (25/100) * 360 = 90 degrees. **Q: When should I not use a pie chart?** A: Avoid pie charts when you have more than 6-7 categories, when the categories have very similar values (making slices hard to distinguish), or when you need to compare exact quantities. Bar charts are generally better for precise comparisons. **Q: Why do my percentages not add up to exactly 100%?** A: Small rounding differences can cause the displayed percentages to sum to slightly more or less than 100%. This is a normal artifact of rounding each percentage independently. In formal presentations, you may adjust the last category to ensure the sum is exactly 100%. --- Source: https://vastcalc.com/calculators/statistics/pie-chart Category: Statistics Last updated: 2026-04-21