Open Calgary Help Page

Creating charts: pie, column, bar

Pie chart

Starting with a dataset, let's first aggregate the data. From the blue Filter menu, navigate down to the Sort & Roll-Up tab. From the Group By drop-down menu choose the column and then you need to select the column you are rolling up on. The function menu offers you a choice of average, count, sum, maximum and minimum.

Select Visualize and then choose Pie chart. You will be prompted to fill in the Label and Value data.
After you select Apply, notice the changes.
Your pie chart is now generated with the data table underneath. 
From the Visualize menu, you can switch back and forth between different visualizations such as Donut, Column, Bar charts... and many more!