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To find details about a files size, you can right click and select "Get Info":

Get Info Window

When I select a large number of files, and want to get information about all if them together as a single selection, such as the combined total size, I get the same window for every individual selection, and not a single view for the selection as a whole.

How can I get total file sizes for file/folder selections?

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up vote 57 down vote accepted

Instead of +I use ++I to see the info:

enter image description here

Cmd+Ctrl+I does something similar, but gives you a static Summary Info window which doesn't update as your selection changes, and you can open multiple windows for different selections, which is handy for comparing groups of synced folders for example.

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Yup, that's it!! – daviesgeek Mar 16 '12 at 20:00
@daviesgeek I actually didn't know this before. But I always try the option key when looking for new features. – gentmatt Mar 16 '12 at 20:02
The Option key really is incredibly undervalued and versatile... Must re-watch the great Screencast for tips. – stuffe Mar 16 '12 at 20:07
Cmd-Ctrl-I does something similar, but gives you a static "Summary Info" window (doesn't update as selection changes) and you can open multiple windows for different selections. Handy for comparing groups of synced folders. – joelseph Apr 1 '12 at 19:37
Thanks @joelseph I will edit that into the existing answer if it's OK by you - very useful – stuffe Apr 1 '12 at 19:44

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