When should I use a radial bar chart?

Infographics where visual impact matters ● Progress indicators ● Goal completion vs target ● Small number of categories

When should I avoid a radial bar chart?

Precise comparison (arc length is hard to judge) ● Many categories

What are common mistakes with radial bar charts?

Outer bars look larger due to longer arc even with equal values ● Using for precise comparison where a linear bar chart is better ● Not starting from a consistent baseline angle

Comparison

Radial Bar Chart

Bars wrapped around a circular axis. Visually striking but less precise than linear bars.

Q3 OKR Progress

Percent complete toward quarterly goals

View data (4 rows)

Chart data table: Q3 OKR Progress
Metric	Progress
Retention	91
Revenue	85
Users	72
NPS	64

Make a radial bar chart with your data

Use a radial bar chart when…

Infographics where visual impact matters
Progress indicators
Goal completion vs target
Small number of categories

Avoid when…

Precise comparison (arc length is hard to judge)
Many categories

Data it needs

Property	Value
Min Rows	2
Min Columns	2
Column Types	stringnumber

Visual anatomy

Marks

arc

Channels

arc-lengthcolor-hue

Axes

angular

Guiding principles

PerceptionThe Encoding Hierarchy
Arc/angle encoding is less accurate than position; use sparingly

Consider instead

Bar Chart

When precise comparison matters

Common mistakes

Outer bars look larger due to longer arc even with equal values
Using for precise comparison where a linear bar chart is better
Not starting from a consistent baseline angle

History

Descended from Florence Nightingale's rose diagram (1858), modernized for dashboards.

Accessibility notes

Outer arcs read longer than inner arcs at equal values, so consult the data table for precise comparison rather than the visual. Maintain WCAG AA contrast between adjacent arcs.

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