Scaling and units on vector output (SVG/PDF)

[villares]

I have been using "magic" hard-coded "scale factors" when outputting SVG or PDF files.

Is there a better way of getting consistent "mm" or "inches" sizes for a sketch output?

[hx2A]

I don't know about PDF files but I know for SVG you can do something like this

<svg width="130mm" height="178mm" viewBox="0 0 130 178"
xmlns:inkscape="http://www.inkscape.org/namespaces/inkscape"
xmlns="http://www.w3.org/2000/svg"
xmlns:svg="http://www.w3.org/2000/svg">

for a Sketch with size width of 130 and height of 178. Inserting that other stuff after thesvg tag will make it so that if you open it with Inkscape or plot it with a plotter, the dimensions of the shapes drawn will be the same as designed in the code.