%
% Din A4 Laengen  ( 210 mm * 297 mm )
%
\newlength{\dinwidth}
\newlength{\dinheight}
\newlength{\dinmargin}
\newlength{\aussenrand}
\newlength{\innenrand}
\newlength{\randoben}
\newlength{\randunten}
%
\aussenrand3cm      %physikalischer Aussenrand
\innenrand3cm       %physikalischer Innenrand
\randoben2.5cm      %physikalischer Abstand von oben
\randunten3cm     %physikalischer Abstand von unten
%
\setlength{\dinwidth}{21.0cm}
\setlength{\dinheight}{29.7cm}
%
\textwidth\dinwidth
\addtolength{\textwidth}{-\aussenrand}
\addtolength{\textwidth}{-\innenrand}
\setlength{\dinmargin}{\dinwidth}
\addtolength{\dinmargin}{-\textwidth}
\setlength{\dinmargin}{0.5\dinmargin}
\oddsidemargin-1in
\evensidemargin-1in
\addtolength{\oddsidemargin}{\innenrand}
\addtolength{\evensidemargin}{\aussenrand}
\setlength{\marginparwidth}{0.9\dinmargin}
\marginparsep 8pt \marginparpush 5pt
%
\textheight\dinheight
\topmargin -1in
%
\headheight 12pt
\headsep 24pt 
\footskip 24pt
\addtolength{\topmargin}{\randoben}
\addtolength{\textheight}{-\randoben}
\addtolength{\textheight}{-\randunten}
\addtolength{\textheight}{-\headheight}
\addtolength{\textheight}{-\headsep}
