A pie chart or pie graph is a circular illustration that looks like a pie. A pie chart is a circular chart that shows how data sets relate to one another. This means that you’ll need to convert each percent into an angle before you can add it to the pie chart. Nominal data is data that has no specific order or scale, but is categorized only by a name or category type. Pie charts, or circular graphs as they are also known, are a popular way to show how much individual amounts or percentages contribute to the total. wikiHow's Content Management Team carefully monitors the work from our editorial staff to ensure that each article is backed by trusted research and meets our high quality standards. Objective: Create a pie chart for a categorical variable for which values add up to 100%. Keep in mind, however, that a pie chart isn’t always the best way to go.For example, if you have multiple values per category, a clustered column or bar chart will better serve your purposes. That will give you a decimal number between 0 and 1. convert that to a percentage or a portion of a circle. Then you would finish drawing the section by drawing lines through these points. Set up this equation: (x / 19.3) = (360 / 100), where x is the number of degrees you're looking for. In the opening Format Data Labels pane, check the Percentage box and uncheck the Value box in the Label Options section. The pie chart template will automatically determine percentages for you. Data for pie charts Pie charts can convert one column or row of spreadsheet data into a pie chart. The whole pie represents 100 percent, or 360 degrees, which is the angle of a circle. For example, agriculture is 45%, commercial is 20%, manufacturing is unknown, and domestic is unknown. Since (54.55) (3.6) = … Apparently in this case the rounding is causing a discrepancy. Add Data Labels to the Pie Chart There are many different parts to a chart in Excel, such as the plot area that contains the pie chart representing the selected data series, the legend, and the chart title and labels. A verification code will be sent to you. 3. Feeling trapped by your life and career? Pie Charts Pie charts are not recommended in the R documentation, and their features are somewhat limited. References: IBM Corp. I've rounded all decimals where necessary, but when I add up all the sectors it totals 361. Drawing a pie chart from percentages is fairly simple once you understand how to convert percentages to angles of a circle. So you would draw a point outside the protractor at the 0 degree line, and another point at the 97 degree line. You can show the data by this Pie Chart: It is a really good way to show relative sizes: it is easy to see which movie types are most liked, and which are least liked, at a glance. The authors recommend bar or dot plots over pie charts because people are able to judge length more accurately than volume. Pie charts A pie chart is a circular chart. Please enter the email address for your account. Select the data you will create a pie chart based on, click Insert > Insert Pie or Doughnut Chart > Pie. An alternative method of determining the pie chart angle is by multiplying the percentage by 3.6.