
This also works with Cover Flow view, but must be set separately through View Options.

Now when you open any directory in list view, you’ll see the size of directories and their respective contents. If you choose “Set as Default” then the Show Folder Size option will be enabled for all folder sizes on the Mac, displaying each calculated storage capacity of each individual folder, totaling the contents of that folder.


What this trick does is show folder sizes on the Mac, calculated in megabytes, kilobytes, or gigabytes, depending on the total storage size taken up of each individual folder found on the Mac.
