Place small-slice labels outside the pie chart

Place labels for small slices outside the pie chart. For example, move labels outside when the slice is thin or when the label text is long.

Pie charts leave limited room for text inside narrow wedges. Moving small-slice labels outside the circle gives the labels more room and reduces the strain of fitting text into the slices.

Mechanism: Outside labels free the slice from carrying both the wedge and the text, which makes small slices and long labels easier to read.

Evidence: The source says pie charts are hard to label and recommends labeling smaller pie slices outside the chart, especially when labels are long (Muth, 2018).

• User Goal: Keep slice labels readable in a pie chart.
• Data: A pie chart with one or more small slices.
• Chart Setting: Labels are needed on the chart, and some labels are long or hard to fit.
• Success Criterion: Labels fit cleanly without being forced into thin wedges.

Break it when: The slice labels are short and the wedges are large enough to hold them cleanly. Why: The extra outside placement is less necessary.

Sacrifice: You use more space around the pie chart. Risk: Keeping labels inside small wedges leaves the pie hard to label. Mitigation: Move only the smaller-slice labels outside.

Mistake: Keeping long labels inside thin slices. Why it fails: Pie charts are hard to label that way.

Failure Sign: Labels look cramped inside narrow wedges or do not fit cleanly. Quick Check: Inspect the smallest slices and the longest labels first; if they do not fit comfortably, move them outside. Stronger Test: Compare an inside-label draft with an outside-label draft and keep the version with cleaner labels.

• Move the labels for the smallest slices outside the circle.
• Move long labels outside even if the slice is not the smallest.
• Keep inside labels only for wedges that can hold them cleanly.