Pie-% Helper
Free Pie-% Helper: select your labels and values, then Insert ▸ Chart ▸ Pie. To show each slice as a percentage, the share of a value is =value/SUM(range).
How it works
In Excel or Google Sheets, select your labels and values, then Insert ▸ Chart ▸ Pie. To show each slice as a percentage, the share of a value is =value/SUM(range).
Lay out your categories in one column and their values in the next.
Select both columns, then Insert ▸ Chart and choose Pie (or Doughnut).
Turn on data labels and set them to show percentage.
To compute a share in a cell, use =value/SUM(range) and format as a percentage.
What this does
A pie chart shows how parts make up a whole, with each slice sized by its share of the total. It works best with a handful of categories that add to a meaningful 100% — market share, budget split, survey responses. Beyond five or six slices it gets hard to read, where a bar chart usually communicates better.
A worked example
With quarters Q1–Q4 valued 30, 45, 15, 60 (total 150), each slice is value/total: Q4 is 60/150 = 40% of the pie. In a cell, =B2/SUM($B$2:$B$5) gives that share; format it as a percentage and add data labels so the slices are annotated. The donut above recomputes every slice as you edit the values. A pie chart is the fastest way to make a composition obvious — where the money goes, who holds what share. Used on the right data (a few parts of one whole) it is instantly readable to any audience.
Common mistakes
- Using a pie for more than ~6 categories, where slices blur together — switch to a bar chart.
- Plotting values that do not sum to a meaningful whole, so percentages mislead.
- Including a total row in the data, which adds a giant 50% slice.
- Relying on colour alone; add labels so the chart is readable in greyscale.
FAQ
How do I show percentages on each slice?
Add data labels, then in label options tick “Percentage”. Excel computes each slice’s share of the total automatically.
Pie or bar chart?
Pie suits a few parts of one whole; bar charts compare many categories or values that do not sum to 100%. When in doubt, use a bar chart — it is easier to read.
Why does my pie look wrong?
Usually a stray total row or a blank category is included. Plot only the category/value pairs that add to your whole.