# Tag Info

{lengths} is for questions dealing with measurements in TeX. If your question is about the spacing between document elements, use {spacing} instead.

The `calc` package is typically used in length calculations, allowing users to do

``````\newlength{\mylen}
\setlength{\mylen}{2pt-3em+5pc}% 29.14992pt under 11pt font
``````

similar to plain TeX's `\dimexpr 2pt-3em+5pc\relax`. In pure LaTeX, the equivalent would require

``````\newlength{\mylen}
\setlength{\mylen}{2pt}