TeX/LaTeX Font Sizes

To change the font size of text in a TeX/LaTeX document, use:

{\size Text to change the size of.}

where \size is one of:

\tiny
\scriptsize
\footnotesize
\small
\normalsize
\large
\Large
\LARGE
\huge
\Huge

Also see http://en.wikibooks.org/wiki/LaTeX/Fonts#Sizing_text for font size metrics and other details.