## LaTeX forum ⇒ LaTeX Beginner's Guide ⇒ Points to cm

topsquark
Posts: 71
Joined: Wed Oct 05, 2022 10:30 pm

### Points to cm

I suppose many of my questions probably belong in this forum.

Anyway, what is the conversion factor between pt and cm? It's close to 28, but that doesn't seem to be exact.

Thanks!

-Dan

LaTeXguide.org • LaTeX-Cookbook.net • TikZ.org

rais
Posts: 411
Joined: Sun Nov 16, 2014 8:51 pm

### Points to cm

1 in = 2.54 cm = 72.27 pt

KR
Rainer

topsquark
Posts: 71
Joined: Wed Oct 05, 2022 10:30 pm

### Points to cm

rais wrote:1 in = 2.54 cm = 72.27 pt

KR
Rainer

Thank you!

Do you know happen to know where the unit pt is used? Is it a typesetting unit of some kind?

-Dan

rais
Posts: 411
Joined: Sun Nov 16, 2014 8:51 pm

### Points to cm

Yes, a point is the smallest typographic unit of measure.
The ratio of 72.27 pt to 1 in is what (La)TeX uses to adhere to the American Point System, AFAIK.
A PostScript point would be 1/72 of an inch, which is 1 bp (big point) in (La)TeX terms.
To complete the confusion, outside (La)TeX a PostScript point also is given as 1 pt.

OTOH, you could have asked (La)TeX what 1 cm is in pt, because when you ask (La)TeX about a dimension, it will be given in pt, no matter which unit was used to set it:
\documentclass{article}
\newlength\foo
\setlength\foo{1cm}
\begin{document}
1 cm = \the\foo
\end{document}


KR
Rainer