windows 7 - How can I find out the size of all the pdfs in a directory?

I have a folder with multiple subfolders. In Windows 7, I'd like to be able to find out the total size of all of the pdfs (files with extension .pdf) in that folder.

How can I do this?

Answer

Navigate to the topmost directory you want to start the search from, use *.pdf as the search filter in the top right of explorer and hit enter. After the search finishes, select all results with Ctrl-A and hit properties.