Calculate the percentages of a pie chart with equal pies (or sides). Simply count the total number of pies in the pie chart and divide 100 by the sum. The answer will give you the percentage of one pie. Since all other pies are equal, they also have the same percentage. For instance, if there are five equal pies in a pie chart, divide 100 by 5. The answer is 20, which is the percentage of one pie.
Calculate percentage of one unknown pie of a pie chart when the percentages of all other pies are given. Add the percentages of all the other pies and subtract the answer from 100. The answer will be the percentage of the unknown pie.
Calculate percentage of a pie when its angle is known. Divide the angle by 360 since a circle has 360 degrees. Multiply the answer by 100 to get the percentage of the pie.
Calculate pie chart percentages when the actual values of the items being represented in the pie chart are given. Add the actual values of the items. Get the percentage representing an item in the pie chart by dividing its value by the sum of values and multiplying the answer by 100.
For instance, you receive three payments worth $100, $200 and $300 in a month, and you want to represent the payments received for the month on a pie chart. The total of the three payments is $600. Get the percentage representing Payment 1 worth $100 by dividing 100 by 600, and multiplying the answer by 100. The answer is 16.67 percent. The slice representing Payment 1 in the pie chart equals 16.67 percent. Likewise, you can calculate the percentages of the slices representing Payment 2 and Payment 3 in the pie chart.