Graphs and Charts: How to Write a Long Description

The instructions on this page can be used for all types of Graphs and Charts. The most common types are explored further in the bottom sections of this page, and you can find other types through the examples page (links below).

Not all graphs require a long description. More simple graphs and charts can be easily described in 3-4 sentences and can go directly into the Alt-text. When they do need a long description it is important to focus on the facts and data more than any visual elements.

As with maps, ask what is this chart saying? To help answer this question, review the context surrounding the graph.

Are there any striking visual trends in this chart? Remember that charts and graphs are used to give visual impact to data, so summarizing that at the beginning of your description is a good idea.

Begin by providing the title of the graph, and its main purpose (if it is not clear from the title). Then, describe the its structure and design before going into detail, including the type of graph, and the information on the X and Y axes. You want the reader to understand the layout and larger pieces before describing finer details!

Always name the type of graph or chart. This may require some research on your end. You can start with the following website for 80 types of charts & graphs for data visualization (with examples)

If possible, include the data in a table in a long description.

For units, use the full word instead of shortened/abbreviated forms (i.e., Use “seconds” instead of “s”), and ensure units are described consistently throughout the description

See examples on Samples of Alt-Text:Graphs and Charts: Medium Descriptions or Samples of Alt-text: Graphs and Charts Long Descriptions

Remember:

Go to Writing Tip: Using Point Form Technique for a breakdown on how you can start the writing process

Below are the most common chart types we get.

Bar Charts

Below are the guidelines for describing a Bar Chart.

For graphs, you can write a summary of the chart and what it is saying then put the data into a table or list for clarity.

See examples on Samples of Alt-Text:Graphs and Charts: Medium Descriptions or Samples of Alt-text: Graphs and Charts Long Descriptions

If you have any questions, post your question on the Alt-Text Q&A

Pie chart

The description for a pie chart needs to reference the following data elements:

See examples on Samples of Alt-Text:Graphs and Charts: Medium Descriptions or Samples of Alt-text: Graphs and Charts Long Descriptions

If you have any questions, post your question on the Alt-Text Q&A

Navigate Back to Complex Images and Long Descriptions