Use your mouse to size the graph's vertical and horizontal axis equally. Click the "Save" button to save the changes to the spreadsheet and the graph.

If you have uneven distribution of data in your Excel chart, here is a better way to change the automatic axis settings.

Capture relationships between data sets by graphing linear equations in Microsoft Excel 2007. Linear equations allow you to predict values within your data set and view the overall trend.

Learn how to change, edit or rename a Data Series name in Microsoft Excel Graph or Chart without editing the original row or column name.