Sunburst Chart: The Complete Guide to Hierarchical Visualization

A sunburst chart is a multi-ring circular visualization that displays hierarchical data from the center outward. Think of it as a pie chart with multiple concentric layers — the inner ring represents the top-level category, and each subsequent ring breaks those categories down into sub-categories and further detail.

Sunburst charts excel at showing how a whole is divided into parts, and how those parts are further divided — all in a single, compact visual. In this guide, you will learn when to use a sunburst chart, how it compares to other hierarchical charts, and how to build one for free with ChartLoad.

How Does a Sunburst Chart Work?

A sunburst chart organizes data in concentric rings:

• Center circle: The root or total — often left blank or labeled with a summary
• First ring: Top-level categories (e.g., continents, departments, product lines)
• Second ring: Sub-categories within each parent (e.g., countries within continents)
• Third ring and beyond: Even finer breakdowns (e.g., cities within countries)

Each segment's angular width is proportional to its value relative to its parent. This means you can see both the hierarchy and the proportions simultaneously — something that flat charts like bar charts simply cannot do.

Sunburst Chart vs. Other Hierarchical Charts

Several chart types handle hierarchical data. Here is how the sunburst compares:

Key insight: Choose a sunburst when you want a compact, visually striking view of a hierarchy with proportions. Choose a treemap when you need to maximize use of rectangular screen space. Choose a Sankey diagram when the data represents flows rather than containment.

Best Use Cases for Sunburst Charts

1. File System and Disk Usage Visualization

Sunburst charts are the gold standard for showing disk usage. The center represents the root directory, the first ring shows top-level folders, and outer rings reveal sub-folders — instantly showing which paths consume the most space.

2. Organizational Structure

While an org chart shows reporting lines, a sunburst shows headcount distribution. The CEO sits at the center, divisions form the first ring, departments the second, and teams the third. You can immediately see which division has the most people.

3. Product Category Breakdown

E-commerce companies use sunbursts to visualize revenue across product hierarchies: Category > Sub-category > Product line. A single chart reveals that "Electronics > Smartphones > Premium" drives 35% of total revenue.

4. Budget and Expense Allocation

Government and corporate budgets have natural hierarchies. A sunburst chart shows how a total budget flows into departments, programs, and line items — all in one visual.

5. Geographic Hierarchies

Continent > Country > Region breakdowns of sales, population, or any metric work beautifully in sunburst form. Each ring adds geographic granularity.

How to Create a Sunburst Chart with ChartLoad

ChartLoad's sunburst chart maker handles the complexity for you — just enter your hierarchical data.

Step 1: Open the Sunburst Chart Maker

Go to ChartLoad's sunburst chart page. A sample multi-level dataset loads automatically so you can see the format.

Step 2: Enter Your Hierarchical Data

Input your data with parent-child relationships. Each row specifies a category, its parent, and its value. ChartLoad builds the concentric rings automatically from this structure.

Step 3: Customize Colors and Labels

Select a color palette that distinguishes top-level categories clearly. Inner ring segments inherit related hues for their children, creating a natural visual grouping. Toggle labels, tooltips, and the center text.

Step 4: Download

Export as PNG for presentations, SVG for web, or PDF for print. Every download is free and watermark-free.

Sunburst Chart Best Practices

• Limit to 3-4 levels. Each additional ring adds complexity. Beyond four levels, the outermost segments become too thin to read. For deeper hierarchies, allow interactive drill-down or use a treemap.
• Use color to group families. All children of a parent segment should share a color family (e.g., shades of blue for "Electronics," shades of green for "Clothing"). This reinforces the hierarchy visually.
• Label the inner rings. Outer ring segments are often too small for labels. Focus your labels on the first two rings and use tooltips or a legend for the rest.
• Show the total in the center. The center circle is prime real estate. Use it to display the total value, making it easy for readers to contextualize every segment.
• Sort segments by size. Within each ring, arrange segments from largest to smallest (clockwise from 12 o'clock). This helps readers quickly identify the dominant categories.

When NOT to Use a Sunburst Chart

1. Flat (non-hierarchical) data. If your data has no parent-child relationships, a pie chart, bar chart, or donut chart will be simpler and clearer.
2. Precise value comparison. The angular encoding makes it hard to compare two thin outer-ring segments. Use a bar chart or table when exact comparisons matter.
3. Time-series data. Sunbursts show structure, not trends. For data over time, use a line chart or area chart.
4. Very deep hierarchies (5+ levels). The outer rings become unreadable. Consider a collapsible tree or a treemap with drill-down instead.

A sunburst chart is a pie chart that grew up — it shows not just what the parts are, but what the parts are made of.

Build Your Sunburst Chart Today

Ready to visualize your hierarchical data in a single compact chart? Open ChartLoad's free sunburst chart maker and turn your multi-level data into a stunning visualization. No signup, no watermarks, no learning curve — just paste your data and download.