\documentclass[letterpaper, 10 pt, conference]{ieeeconf}


and every time I try to use \tableofcontents, I get a half paged table.

How to make it full page and width?

• Welcome to the site. Can you post a small, fully-working example, to demonstrate this behavior? – Steven B. Segletes Apr 5 '16 at 12:37
• Welcome to SE! Try: \onecolumn\\tableofcontents\twocolumn . Maybe will this help. – Zarko Apr 5 '16 at 12:37
• @Zarko there's one \ too much and one effect is a pagebreak after the TOC – naphaneal Apr 5 '16 at 12:42
• @naphaneal, I see. This is typing error (my keyboard is very old and inclined to bouncing...). Correct is \onecolumn\tableofcontents\twocolumn. – Zarko Apr 5 '16 at 12:43
• why would you try to put a TOC in a conference paper? – percusse Apr 5 '16 at 19:24

From your question is not very clear (to me), how your document (article?) should look:

• as one column article: in this case you should declare

\documentclass[letterpaper, 10 pt, conference, onecolumn]{ieeeconf}
% other used packages and title definition

\begin{document}
%title, abstract etc
\tableofcontents
% rest of article
\end{document}


• as combined layout where the \tableofcontents is in one column, the following rest of document in standard twocolum:

\documentclass[letterpaper, 10 pt, conference]{ieeeconf}
% other used packages and title definition

\begin{document}
%title, abstract etc
\onecolumn
\tableofcontents
\twocolumn
% rest of article is in two column
\end{document}


• as combined layout where for the \tableofcontents is reserved whole first page in one column layout and the following rest of pages intwocolum layout:

\documentclass[letterpaper, 10 pt, conference]{ieeeconf}
% other used packages and title definition

\begin{document}
%title, abstract etc
\onecolumn
\tableofcontents

\clearpage
\twocolumn
% rest of article is in two column
\end{document}


For testing above cases I need from you a Minimal Working Example (MWE). See, which of above cases you actually like to have.

You can tweak the class choices:

\documentclass[letterpaper,10pt]{IEEEconf}

\usepackage{lipsum}

\begin{document}

\author{A. Uthor}
\title{Title}

\twocolumn[
\maketitle
\tableofcontents
\bigskip\bigskip
]

\section{First}
\subsection{Hello}
\lipsum[1-2]

\section{Second}
\subsection{Hello}
\lipsum[3-4]

\section{Third}
\subsection{Hello}
\lipsum[1-2]

\section{Fourth}
\subsection{Hello}
\lipsum[3-4]

\end{document}