Polygon Chart: Definition & Overview

A polygon chart is a type of data visualization that displays multivariate data across multiple axes arranged radially around a central point. Each axis represents a distinct variable or category, and data points are plotted along each axis. When the data points are connected by straight lines, they form a polygon — hence the name "polygon chart."

Other Names for Polygon Charts

Polygon charts are also commonly known as radar charts, spider charts, web charts, star plots, star charts, cobweb charts, kiviat diagrams, and rose diagrams. All these names describe the same type of visualization. The terminology varies by industry and region, but the underlying chart structure is identical.

In AnyChart and Highcharts documentation, "polygon chart" specifically refers to an area series displayed on a polar plot with a categorized X-scale. In general usage, however, "polygon chart" is used interchangeably with "radar chart" and "spider chart."

Key Characteristics of Polygon Charts

Polygon charts have several defining characteristics. First, they display three or more quantitative variables simultaneously on axes that radiate from a common center point. Second, each axis represents a different category, metric, or variable, with values increasing outward from the center. Third, data points are connected to form a closed polygon shape, and the area of this polygon can be filled to enhance visual differentiation between multiple data series.

When Should You Use a Polygon Chart?

Polygon charts are most effective for comparative analysis across multiple variables, especially when you want to visualize a complete "profile" for one or more subjects. They excel at revealing overall patterns, identifying strengths and weaknesses, and comparing two or more subjects across the same set of dimensions. They are less effective when differences between values are very subtle, when there are too many axes (more than 10–12 becomes cluttered), or when precise numerical comparisons are needed.