Posted by dellus on Dec 29, 2017; 6:19pm
URL: https://forum.librecad.org/LebreCAD-print-scale-formula-tp5715656p5715657.html

I'm not sure, but I think it just tries to fit the drawing onto the paper with a margin of a certain extent around the objects to the paper border. So you usually will have to set the exact scale manually.