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Is it possible to display a per-mode=fraction unit as a small fraction (\tfrac) in displaystyle math mode? In the following MWE, the first output is what I want in the displaystyle math mode.

\documentclass{minimal}
\usepackage{siunitx}
\sisetup{per-mode=fraction}
\begin{document}

$\SI{1}{\metre\per\second}$
$\displaystyle \SI{1}{\metre\per\second}$

\end{document}

enter image description here

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up vote 8 down vote accepted

You can use the fraction-function key of siunitx. \tfrac is provided by amsmath.

\documentclass{article}
\usepackage{amsmath}
\usepackage{siunitx}
\sisetup{
  per-mode=fraction,
  fraction-function=\tfrac
}
\begin{document}

$\SI{1}{\metre\per\second}$
$\displaystyle \SI{1}{\metre\per\second}$

\end{document}

enter image description here

share|improve this answer

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