How to Display All Folder Sizes in Finder (macOS)

Here’s how you make Mac’s Finders show the sizes of all folders in any Finder window:

1. Open Finder
2. Go to List view

3. Go to View > Show View Options (shortcut: Cmd + j)

4. Check the checkbox Calculate all sizes

That’s all, now you can see the size of any folder in Finder under list view.