Illustrator: View -> Actual Size smaller than life size?

Question

I'm using Illustrator CS6 on OS X. When choosing View -> Actual Size, the displayed elements are smaller on the screen than their actual size, say in centimetres. How can I "calibrate" Illustrator to my screen's resolution (dpi) so that it can display objects at life size when using 100% zoom?(Acrobat does have a DPI setting in its preferences, and I assume Illustrator must have it too. But I cannot find it.)Edit: To clarify, if I put a ruler next to the screen, and also turn on the ruler in the document, I want them to match up when selecting View -> Actual Size.

Answer 1

(Command R) or

in the menu bar go to view > rulers> show ruler

that is true to life measurement

To find out the actual size of a shape.

Window> transform

a transform box will pop up.

now click on a shape

if you look at the transform box while the shape is selected the. ( w ) is the width and the (H) is the height. That is the actual size.

When you print the document out it will be the that actual size.

use the transform box and the ruler to gauge your scaling