How to find the size of a file or folder

How can I find the size of a file or folder?
I am trying to determine the size of my iPhoto and Mail folder.
It says "Size: --" under general from Get Info.

It's working fine...
When you ask for that info, and Finder presents those '--' dashes instead of a value, actually, Finder is calculating the value in background.
That's something that i recently noticed and wonder why tha heck he needs to do all that work by himself, kinda re-inventing the wheel of file size value "calculus"...
I posted some thoughts about it here: File / Folder size... How do Finder gets it?
Will appreciate feedback about this!
Props!

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