Pie and donut charts in Power BI - Step-by-Step Guide

Introduction

Pie and donut charts show parts of a whole. They help you see how different categories compare in size. Use them to quickly understand proportions in your data.

When you want to show sales distribution by product category in a simple visual.

When you need to compare market share percentages among competitors.

When you want to display survey results as parts of total responses.

When you want to highlight the biggest contributors to total revenue.

When you want a visual that is easy for anyone to understand at a glance.

Steps

Step 1: Click

- Report view pane

The report canvas is active and ready for visuals

Step 2: Select

- Visualizations pane > Pie chart icon

A blank pie chart visual appears on the canvas

Step 3: Drag

- Category field from Fields pane to Legend well in Visualizations pane

The pie chart slices are created based on categories

Step 4: Drag

- Value field from Fields pane to Values well in Visualizations pane

The pie chart slices size adjusts to the values

Step 5: Click

- Visualizations pane > Format (paint roller icon)

Format options for the pie chart appear

Step 6: Toggle

- Format pane > Details > Donut toggle

The pie chart changes to a donut chart with a hole in the center

💡 Use donut charts to add a label or number in the center

Step 7: Adjust

- Format pane > Data colors

Colors of slices update to your chosen palette

Before vs After

Before

Blank report canvas with no visuals

After

Pie chart showing sales by product category with slices sized by sales amount and legend on the right

Settings Reference

Legend

📍 Format pane > Legend

Show or hide the legend and choose where it appears

Default: On, Position: Right

Detail labels

📍 Format pane > Detail labels

Control what text appears on each slice

Default: Category and Percent of total

Donut toggle

📍 Format pane > Details

Switch between pie chart and donut chart style

Default: Off

Data colors

📍 Format pane > Data colors

Change slice colors to match your theme or preference

Default: Automatic colors

Common Mistakes

Using too many categories in the pie chart

Too many slices make the chart hard to read and colors confusing

Limit categories to 5-7 or group smaller ones into 'Other'

Not adding values to the Values well

The pie chart will not show slice sizes and looks empty

Always drag a numeric field to Values to size slices properly

Using pie charts for data that changes over time

Pie charts do not show trends or changes well

Use line or bar charts for time series data

Summary

Pie and donut charts show parts of a whole using slices.

Add category fields to Legend and numeric fields to Values to build the chart.

Limit categories for clarity and use donut style to add center labels.

Practice

1. What is the main purpose of a pie chart in Power BI?

easy

A. To list data in rows and columns

B. To show parts of a whole as slices of a circle

C. To compare two numerical values side by side

D. To display trends over time with lines

Solution

1. Step 1: Understand pie chart basics

   A pie chart divides a circle into slices representing parts of a whole.

2. Step 2: Compare with other chart types

   Line charts show trends, bar charts compare values, tables list data. Only pie charts show parts of a whole as slices.

3. Final Answer:

   To show parts of a whole as slices of a circle -> Option B

4. Quick Check:

   Pie chart = parts of whole [OK]

Hint: Pie charts always show parts of a whole circle [OK]

Common Mistakes:

• Confusing pie charts with line charts
• Thinking pie charts show trends over time
• Using pie charts for detailed data tables

2. Which of the following is the correct way to add a donut chart in Power BI?

easy

A. Select the donut chart icon from the Visualizations pane

B. Write a DAX formula to create a donut chart

C. Use the Data view to draw a donut chart manually

D. Insert a pie chart and then change its color to white

Solution

1. Step 1: Identify how to add visuals in Power BI

   Power BI provides a Visualizations pane with icons for different charts.

2. Step 2: Find the donut chart icon

   The donut chart icon is available to select directly; no DAX or manual drawing is needed.

3. Final Answer:

   Select the donut chart icon from the Visualizations pane -> Option A

4. Quick Check:

   Donut chart = Visualizations pane icon [OK]

Hint: Use the Visualizations pane icons to add charts [OK]

Common Mistakes:

• Trying to create charts with DAX formulas
• Using Data view to draw charts manually
• Changing colors to fake chart types

3. Given a dataset with categories and sales, what will a donut chart show if you drag 'Category' to Legend and 'Sales' to Values?

medium

A. A bar chart comparing sales amounts

B. A line showing sales trend over categories

C. A table listing sales by category

D. Slices representing sales share of each category

Solution

1. Step 1: Understand donut chart data fields

   Legend defines slices (categories), Values define slice sizes (sales amounts).

2. Step 2: Interpret the visual output

   The donut chart will show slices sized by sales share per category, not trends or tables.

3. Final Answer:

   Slices representing sales share of each category -> Option D

4. Quick Check:

   Legend + Values = slices sized by values [OK]

Hint: Legend = slices, Values = slice size in pie/donut charts [OK]

Common Mistakes:

• Expecting a line or bar chart from a donut chart
• Confusing legend with axis in charts
• Thinking donut charts show raw numbers, not shares

4. You created a donut chart but it shows only one slice instead of multiple categories. What is the likely cause?

medium

A. The 'Category' field was not added to the Legend well

B. The 'Sales' field is empty or zero for all categories

C. The donut chart does not support multiple slices

D. The data model has no relationships

Solution

1. Step 1: Check the Legend field in the donut chart

   If 'Category' is missing or not properly added to Legend, the chart shows one slice.

2. Step 2: Verify other options

   Empty sales would show no slices, donut charts support multiple slices, and relationships affect filtering but not basic slices.

3. Final Answer:

   The 'Category' field was not added to the Legend well -> Option A

4. Quick Check:

   Legend missing = one slice [OK]

Hint: Always add categories to Legend for multiple slices [OK]

Common Mistakes:

• Assuming donut charts can't show multiple slices
• Ignoring the Legend field placement
• Blaming data model relationships for slice count

5. You want to show total sales in the center of a donut chart along with category slices. Which feature should you use in Power BI?

hard

A. Use the donut chart's center text option to display total sales

B. Enable the 'Detail labels' and set 'Label style' to 'Data value and percentage'

C. Add a card visual on top of the donut chart manually

D. Create a measure that sums sales and add it to Legend

Solution

1. Step 1: Understand donut chart limitations

   Built-in donut charts do not have a direct center text option for totals with multiple category slices; the center category label works only for single categories.

2. Step 2: Apply best practice workaround

   Create a total sales measure, add a Card visual to display it, and manually position the card in the donut's center hole. Other options fail: no center text (A), labels on slices (C), legend misuse (D).

3. Final Answer:

   Add a card visual on top of the donut chart manually -> Option C

4. Quick Check:

   Card overlay = donut center total [OK]

Hint: Overlay Card visual in donut center for totals [OK]

Common Mistakes:

• Believing donut charts have native center text for totals
• Adding totals to Legend field
• Using detail labels expecting center display