Increase page numbers in LaTeX Beamer

The frame option noframenumbering will exclude certain frames from increasing the framenumber. I would recommend to use it in combination with the plain option, otherwise it might look that the frames with the toc will show the same frame number as the frame before.

\documentclass{beamer}

\setbeamertemplate{footline}[frame number]

\AtBeginSection[]{%
    \begin{frame}[noframenumbering,plain]
    \tableofcontents[currentsection]
    \end{frame}
}

\begin{document}

\section{title}
\begin{frame}
\end{frame}

\end{document}

Add the line

\addtocounter{framenumber}{-1}

on each frame you wish to exclude from total count.

See also this other Question here on Stackoverflow, which might assist you further.

Add [plain] to not display the header and the footer. Finally, add \addtocounter{framenumber}{-1} to not increment page number.

\AtBeginSection[]{%
    \begin{frame}[plain]
    \addtocounter{framenumber}{-1}
    \tableofcontents[currentsection]
    \end{frame}
}