\documentclass[portrait,a0b,draft]{a0poster}
\usepackage{hfont}
\begin{document}
The following font sizes are available:
\tiny tiny ŸÀÌ´Ï 12pt
\scriptsize scriptsize ½ºÅ©¸³Æ®»çÀÌÁî 14.4pt
\footnotesize footnotesize Dz³ëÆ®»çÀÌÁî 17.28pt
\small ½º¸ô 20.74pt
\normalsize ³ë¸Ö»çÀÌÁî 24.88pt
\large ¶óÁö 29.86pt
\Large ¶óÁö 35.83pt
\LARGE ¶óÁö 43pt
\huge ÈÞÁî 51.6pt
\Huge ÈÞÁî 61.92pt
\veryHuge º£¸®ÈÞÁî 74.3pt
\VeryHuge º£¸®ÈÞÁî 89.16pt
\VERYHuge º£¸®ÈÞÁî 107pt
\end{document}