Is there a way to convert dimensions to inches in OS X? When I Get Info on a pdf or an image it gives me the dimensions in points, which is great. I need to know how big an image would be, at full size, in inches. Is there somewhere in OS X where that info is available? I found this question where you can get that info via Preview, but having to open each file is painful.
Open the file in Preview. Press command + I to open the Inspector window. You'll find the DPI of the image. 



You should get the required DPI in of the image.

Now launch Spotlight and divide image size in each dimension with the DPI. You should get your answer.