Stacked column charts are a great way to visualize data that consists of different parts making up a whole. For example, showing revenue broken down into categories like product sales, services, etc.

However, a limitation of stacked columns is that it can be difficult to see the exact values for each segment. This is where data labels can be extremely helpful.

When to Use Data Labels

Here are some examples of when to use data labels on a stacked column chart:

When you want to emphasize specific values in the columns
To show percentages or totals for each segment
When the audience needs to see precise figures

To highlight trends over time as values change

In general, data labels improve a stacked column chart by making the individual values clear and easy to interpret.

How to Add Data Labels in PowerPoint

Adding data labels in PowerPoint is straightforward:

Select the stacked column chart and click the “+”” button next to “Chart Elements”
Check the box next to “Data Labels”

This will add basic data labels showing the values for each segment.

Customizing Data Labels

To customize data labels:

Right click on a data label and choose “Format Data Labels”
Adjust options like label position, separator, font size, color, etc.

You can show values, percentages, or values from cells here.

Showing Totals

To display totals for each stacked column:

Add a totals data series (set to line with no fill)

Make sure the totals use values from a cells range
Set label position to above
Increase font size for emphasis

Data Label Best Practices

When adding data labels, keep these best practices in mind:

Choose a label position that doesn’t obstruct column segments
Use consistent formatting for all data labels

Adjust font size so labels are legible
Show the most relevant values (totals, percentages, etc.)
Make key data labels stand out with bold or contrasting colors

Alternatives to Data Labels

If data labels make your stacked column too cluttered, consider these alternatives:

A data table below the chart
Floating text boxes with key values

Annotations pointing to specific columns
Showing abbreviated totals in the legend
Linking the chart to Excel so viewers can see values in source data

The goal is balancing clarity with clutter – use judgment to pick the right approach for your audience.

In summary, data labels can greatly improve stacked columns by revealing key values. Follow PowerPoint best practices when adding and formatting labels to maximize effectiveness. Carefully chosen data labels make data easier to comprehend accurately.