How to reduce the margins in KOMA-Script

Question

I am making a report using LaTeX. It is looking fine but there is a really large space taken up by the margins. Here is the main tex file:

\documentclass[fontsize=13pt]{scrreprt}
\usepackage[pdftex]{graphicx}
\usepackage{color}
\usepackage{gensymb}
\usepackage{mathtools}
\usepackage{fancyhdr}

%%    homebrew commands -- to save typing
\newcommand\msp{\textup{\normalsize MSP430 Launchpad }}
\newcommand{\HRule}{\rule{\linewidth}{0.5mm}}
\def\onequarter{\frac{1}{4}}
\pagestyle{fancy}
% New colors

\definecolor{orange}{RGB}{255,127,0}

\begin{document}
\input{./title.tex}
\input{./cert.tex}
\input{./ack.tex}

\tableofcontents
\input{./intro.tex}
\input{./learn.tex}
\input{./comp_list.tex}
\input{./comp_desc.tex}
\input{./block.tex}
\input{./ckt_dia.tex}

%-----------------------------------------------------------
%-----------------------------------------------------------
%\addcontentsline{toc}{chapter}{\numberline{}Bibliography}
%-----------------------------------------------------------
%-----------------------------------------------------------
\end{document}

How may I reduce the margin to maybe half of what it is right now?

Answer 1

The easiest way is perhaps to use the DIV=<value> option for the document class, see table 2.1 in section 2.6 Options and Macros to Influence the Page Layout in the (English version of) the KOMA-script manual (dated 2013-12-19). You can choose integers from 6 to 16, where larger numbers give a larger type area, i.e. smaller margins.

For example

\documentclass[fontsize=13pt,DIV=14]{scrreprt}

Browsing the manual, I also see that you can set the type area with

\areaset[BCOR]{Width}{Height}

where BCOR is binding correction. Read chapter 2 Construction of the page layout with typearea of KOMA script's manual for more information.

Answer 2

You can use the geometry package to easily change the margins:

\usepackage[top=tlength, bottom=blength, left=llength, right=rlength]{geometry}

Or

\usepackage[letterpaper]{geometry}

EDIT: For KOMA-Script, you should use the typearea package that is part of the bundle to change the page layout, not the geometry package. See Chapter 2 of the KOMA-Script Documentation