Here's a little program that would have been better for the NANY.
I made it for myself, but I like to share (for free), so here it is!
It is a handy dandy calculator for converting pixels to inches or centimeters and vice-versa. You set the dpi, height, width of your image and it will give you immediate results and automatically copy them to your clipboard. You can also drag-n-drop images onto PixCalc and it will read the dimensions and dpi for you.
It comes with a chm help file.Download link
I'd like to know what you think!