Frankfurt theme show total number of slides

Question

In the Frankfurt theme, beamer package, by default in the bottom right corner is shown the page number. How can I change this so that it not only shows the page number, but also the total number of pages (e.g. 5/30)?

Answer 1

With package: \usepackage{lastpage}

you can have the number of the last page with \pageref{LastPage}.

Answer 2

By default, in Frankfurt theme, footline beamer-template is empty. In your preamble, try \setbeamertemplate{footline}[page number] or \setbeamertemplate{footline}[frame number] (with some versions of beamer before 3.51, you must also fix the color used to typeset the page number or frame number).

\documentclass{beamer}
\usetheme{Frankfurt}
\setbeamertemplate{footline}[page number]
% \setbeamertemplate{footline}[frame number]
\setbeamercolor{page number in head/foot}{fg=fg} % beamer version < 3.51
\begin{document}
\section{First}
\begin{frame}
  \frametitle{Demo 1}
  \begin{itemize}
  \item<+->first item
  \item<+->second item
  \end{itemize}
\end{frame}
\begin{frame}
  \frametitle{Demo 2}
  \begin{itemize}
  \item<+->first item
  \item<+->second item
  \end{itemize}
\end{frame}
\end{document}