How big is a LEGO torso in Microsoft Paint I am trying to print decals, but I don't know how the size of the torso or any other parts are supposed to scale in my Microsoft Paint.
The size won't matter in Paint, what will matter is the resolution of your printer.

For example, if you want to print 1 inch by 1 inch, and your printer is 800 DPI, then you need an 800x800 image.