Visualization types

Bar Chart

Also known as: bar graph

A bar chart displays categorical data with rectangular bars whose length or height corresponds to the value of each data point.

Bar charts can be visualized using vertical or horizontal bars. Bar charts are best used to compare a single category of data or several. When comparing more than one category of data, the bars can be grouped together to created a grouped bar chart.

Bar charts use volume to demonstrate differences between each bar. Because of this, bar charts should always start at zero. When bar charts do not start at zero, it risks users misjudging the difference between data values.


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In addition to the guidance provided in this section, relevant guidance can also be found in the Agency Logo, Axes, Colors, Grids, Labels, Legends, Source, Titles, Typography sections.