How to Plot Two Things on the Same Y Axis in Excel. Properly formatted charts and graphs can help you grasp the patterns and trends hidden within the raw data of an Excel spreadsheet.

For example, you could show line graphs for temperature and humidity on top of each other. For this purpose, Excel lets you add a series of data to a chart and plot it on a second y-axis.

This article explains how to add a secondary axis to a chart in Excel so you can view unlike categories on the same graph. These instructions work in Excel in Microsoft 365, Excel 2021, Excel 2019 ...