\documentclass[]{article}%

\usepackage{gcheck}

\usepackage[a6paper,asymmetric, bindingoffset=18pt,
  marginparwidth=.8in, reversemp,
  hmarginratio=2:1, vmarginratio=4:5,
  left=1in, top=1in]{geometry}
\geometry{dvips,showframe}

\begin{document}

\typeout{}
\dcheck\paperwidth{298.75394pt}
\dcheck\paperheight{423.94606pt}
\dcheck\textwidth{172.34895pt}
\dcheck\textheight{261.3386pt}
\dcheck\oddsidemargin{18.0pt}
\dcheck\evensidemargin{0pt}
\dcheck\topmargin{-37.0pt}
\dcheck\headheight{12.0pt}
\dcheck\headsep{25.0pt}
\dcheck\footskip{30pt}
\dcheck\marginparwidth{57.81621pt}
\dcheck\marginparsep{11.0pt}
\dcheck\columnsep{10pt}
\dcheck\hoffset{0pt}
\dcheck\voffset{0pt}
\ccheck\mag{1000}
\checkresults
\typeout{}

\manyfoxes\manyfoxes
\end{document}
