How to show margin distances in mm

Question

I would like to know the distance (in mm) of the margins I just set, and I would like them to be displayed in the document (for debugging purposes, of course).

I use the showframe option of the geometry package in order to denote the margins. How do I get to display the margin values?

This is a super MWE:

\documentclass[12pt,twoside,a4paper]{scrreprt}
\usepackage[pass,showframe]{geometry}
\usepackage{lmodern}
\usepackage{kantlipsum}

\begin{document}
\kant[1-10]
\end{document}

I would like it to be something like this (taken from Golden Ratio for vertical poem positioning):

enter image description here

Of course, I don't care about the text inside, just the margins (margin par, topmargin, innermargin, etc.)

As a follow-up to egreg's comment, see for example http://tex.stackexchange.com/questions/42371/margins-and-text-position/42381#42381 and http://tex.stackexchange.com/questions/42329/displaying-page-construction-guides/42330#42330 and http://tex.stackexchange.com/questions/17957/is-there-a-picture-showing-all-the-lengths-used-in-lists/17962#17962 — Torbjørn T., May 29 '14 at 12:07
possible duplicate of How can I easily display the dimensions of the text body? — Werner, Jun 04 '14 at 18:28
@Werner Definitely related, but I'm not so sure if a duplicate: a big part of the problem for me was to get the data in mm — Mario S. E., Jun 04 '14 at 18:49
Also related: http://tex.stackexchange.com/questions/51396/overview-of-margins-in-koma-script-typearea — Mario S. E., Jun 04 '14 at 19:20

score 19 · Accepted Answer · answered Jun 04 '14 at 18:03

Based on Gonzalo Medina' suggestion, and with a little bit of help with the documentation, I was able to achieve this with the layouts package:

\documentclass[12pt,twoside,a4paper]{scrbook}
\usepackage{lmodern}
\usepackage{layouts}

\begin{document}

\printinunitsof{mm}{\pagevalues}

\verb|\marginparwidth|: \printinunitsof{mm}\prntlen{\marginparwidth}

\pagediagram
\end{document}

With this result:

enter image description here

How to show margin distances in mm

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