i have a project im working on and i need to use inkscape to resize a picture to the actual dimensions of the final product when i print. its kind of confusing, but ill tell you what its kinda about.

theres a line in the middle of the SVG that is supposed to be 51mm in real life. i need to scale it so that when i print, that line in real life measures 51mm. i will attatch the picture so you can see what im talking about.

Try this extension: https://inkscape.org/en/~Moini/%E2%98%8 ... own-length