\settoheight{len-cmd}{text}
The \settoheight
command sets the value of a
length command, len-cmd
,
which is specified as the first argument, equal to
the maximum height of the text
argument in the current font.
For example,
\settoheight{\baselineskip}{Xanadu}
\setlength{\baselineskip}{1.5\baselineskip}
would set the value of \baselineskip
to 1.5 times the height of the capital "X".