Question

How do I determine which version of macOS is running on my computer?

Answer

1. Click on the Apple Icon from the Menu Bar
   
   
   
   
2. Select About This Mac
3. The resulting window shows the operating system version information. In the example below, the machine is running macOS Mojave 10.14.6
   
   
   
4. Mac OS:
   
   • macOS 11.0:   Big Sur - 2020
   • macOS 10.15: Catalina (Jazz) - 7 October 2019
   • macOS 10.14: Mojave (Liberty) - 24 September 2018
   • macOS 10.13: High Sierra (Lobo) - 25 September 2017
   • macOS 10.12: Sierra (Fuji) - 20 September 2016
   • OS X 10.11: El Capitan (Gala) - 30 September 2015