Simply put, pie charts are best used to show parts of a whole. Specifically, pie charts should illustrate meaningful relationships between percentages, or parts of 100%. If the data you want to display doesnt add up to 100%, a pie chart might not be your best choice.
Does pie chart have to equal 100?
Pie charts are designed to show parts of a whole, so any sum below or above 100% doesnt represent the entire picture. Finally, when it comes to legends, pie charts dont generally need one.
Why do some graphs not add up to 100%?
Due to rounding, percentages may not always appear to add up to 100%. You can control how many decimal points to display when you customize a chart or data table.
What should be included in a complete pie chart?
In order to use a pie chart, you must have some kind of whole amount that is divided into a number of distinct parts. Your primary objective in a pie chart should be to compare each groups contribution to the whole, as opposed to comparing groups to each other.
Why does adding percentages not work?
The problem is a percentage is calculated from a specific base value. After the first percentage change, the base changes, and the second percentage does not have the same base. Two percentages that have different base values cannot be directly combined by addition!
What is the ideal range of sections for a pie chart?
Pie charts work best for values around 25%, 50% or 75%. Its easier for readers to spot these percentages in a pie chart than in a stacked bar or column chart. Pie charts are not the best choice if you want readers to compare the size of shares. This is especially true if the differences between the shares are small.
What is a limitation of using a pie charts?
Disadvantages of a Pie Chart If too many pieces of data are used, pie chart becomes less effective. They themselves may become crowded and hard to read if there are too many pieces of data, and even if you add data labels and numbers may not help here.
What is 1/8 in a pie chart?
Fractions are often represented as pie charts, where a circle is broken into slices called sectors. For example, the central angle of the dark-shaded sector above is one-eighth of the circle, so its area is 81 the area of the circle.