The Doughnut Chart is a built-in chart type in Excel. Doughnut charts are meant to express a "part-to-whole" relationship, where all pieces together represent 100%. Doughnut charts work best to display data with a small number of categories (2-5). For example, you could use a doughnut chart to plot survey questions with a small number of answers, data split by gender, Windows vs. Mac users, or other data where categories are limited.
Doughnut charts should be avoided when there are many categories, or when categories do not sum to 100%.
Simple, compact presentation
Can be read "at a glance"
Excel will calculate percentages automatically
Difficult to compare relative size of slices
Become cluttered and dense as categories are added