George wants to print something in MS Paint that is exactly the dimensions that it is supposed to be. But it doesn't ever work out that way. How can he? Leo says it's actually a complex problem because of the screen's size, the resolution of the printer, and other considerations. In most cases, what you want to do is select the option "actual size" from your printer utility. You can calculate the dots per inch / your screen size. Adobe Photoshop Elements can do it accurately and Irfanview or Paint.Net.