I know there are all sorts of commands to change the line height.
But I would like to display it, just like I do with font size \fontname\font\ or \@font.
My question is different then this as I don't mind how the baseline is calculated of if it changes during the text.
I'm interested in the default value for the given font size.
\documentclass[10pt,a5paper]{memoir}
\usepackage[T1]{fontenc}
\usepackage[utf8]{inputenc}
\usepackage[adobe-utopia]{mathdesign}
\begin{document}
This text is \fontname\font\ or \@font with %\baselineskip
\end{document}

\baselineskipis height + depth, you can display it using\the\baselineskiporprintlen. The height would be something like\ht\strutboxand can be printed also with\the\ht\strutboxorprintlen– Schweinebacke Jan 11 '17 at 17:48