I want to use a font size other than the standard LaTeX list of tiny, huge, etc. How can I do that?
Set font size. The first parameter is the font size to switch to; the second is the
\baselineskipto use. The unit of both parameters defaults to pt. A rule of thumb is that the baselineskip should be 1.2 times the font size.
As @frabjous noted, you'll need to add
\selectfont afterwards to make it kick in.
There are a couple of LaTeX packages available that provide for additional font sizes:
moresize package offers additional commands to have a broader range (
extsizes extends the standard LaTeX classes by additional class options (
20pt for the base font, so that all fonts in the document become smaller or bigger, but remain their relative difference. Advanced document classes (memoir, but especially the KOMA-Skript bundle) provide built-in capabilities for flexible font sizes.