When should I use a grouped bar chart?

Comparing sub-groups within categories ● 2-4 groups per category

When should I avoid a grouped bar chart?

More than 4 groups (becomes cluttered) ● More than ~5 categories on the x-axis (groups stack into noise) ● When totals matter more than parts (use stacked bar)

What are common mistakes with grouped bar charts?

Too many groups per category ● Inconsistent group ordering

Comparison

Grouped Bar Chart

Multiple bars per category placed side by side for direct comparison across groups.

Headcount by Department and Gender

Engineering skews male, Marketing skews female

View data (5 rows)

Chart data table: Headcount by Department and Gender
Department	Men	Women
Engineering	82	34
Sales	64	48
Marketing	35	52
Design	28	41
Support	22	38

Make a grouped bar chart with your data

Use a grouped bar chart when…

Comparing sub-groups within categories
2-4 groups per category

Avoid when…

More than 4 groups (becomes cluttered)
More than ~5 categories on the x-axis (groups stack into noise)
When totals matter more than parts (use stacked bar)

Data it needs

Property	Value
Min Rows	2
Min Columns	3
Column Types	stringnumber

Visual anatomy

Marks

rectangle

Channels

position-xlength-ycolor-hue

Axes

x-categoricaly-quantitative

Guiding principles

Consider instead

Stacked Bar Chart

When composition matters more than comparison

Common mistakes

Too many groups per category
Inconsistent group ordering

History

Extension of the basic bar chart for multi-series comparison, common since the mid-20th century.

Accessibility notes

Hue is the only signal separating the groups, so pair color with patterns or direct labels for color-vision-deficient readers. The accompanying data table makes values screen-reader accessible.

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