Question: how to make a pie chart based on percentage in excel?
Answer: Select the data you will create a pie chart based on, click Insert > Insert Pie or Doughnut Chart > Pie. ... 
Then a pie chart is created. ... 
Now the corresponding values are displayed in the pie slices. ... 
In the opening Format Data Labels pane, check the Percentage box and uncheck the Value box in the Label Options section.