How to build the pie
Start with the sample and replace it. The title should name the whole, such as orders by weekday or budget by category. The subtitle can say the time or the unit. Each row is one slice: a short label and one positive number. A zero slice disappears, which is what you want when a category did not occur. Negative numbers do not belong on a pie. If you have losses or changes, use the waterfall chart instead.
Keep the number of slices small. Six slices are comfortable. Past eight, the labels fight and the thin slices become decoration. Merge the smallest leftovers into one slice called Other, and say so in the subtitle. Sort by value when you want the largest share to lead. Leave the sort off when the order itself means something, such as days of the week or steps in a process.
Colors are the legend. Give each slice its own color from the six swatches, and keep neighboring slices different enough that a print in gray still separates them. Do not rely on color alone. The legend prints the name, and you can put the percentage or the raw value on the wider slices. Percentages are the usual choice because a pie is already about share. Turn percentages off when the raw count is the number people came to see.
The start angle rotates the first slice. A small turn can keep a label from landing on a crowded side. It does not change the data. The background and the text color affect the title and the legend, not the slices. If the title and the background are close in brightness, darken the text before you export. The picture is saved only in this browser.
Download PDF for a handout or a report page, PNG when the chart will sit on a web page or a slide and the words should stay sharp, and JPEG when the tool that receives the file expects a photo. After the export, use the grid under this article to open a doughnut chart if you want the same shares with an empty center, or a bar chart if a reader needs to compare the sizes more precisely than a wedge allows.