I suspect the answer is a straight 'No', but nothing ventured... I have a table of time periods (minutes and hours), and a couple of the periods involve the fraction 1/2. I generally use the \SI macro of the siunitx package for numbers and units, as it gives a nice spacing between the number and the unit. I could use 0.5 rather than the fraction 1/2, but in this particular case the fraction is more aesthetically and stylistically pleasing. I have tried using the \nicefrac{1}{2} macro within the first brackets of the \SI{*number*}{*unit*} macro, but it does not seem to work. Is there another way of achieving the same objective?

MWE as follows:


A nice fraction: 2\nicefrac{1}{2}.

Some time periods:




The above all works fine.

% This, however, does not:

% \SI{2\nicefrac{1}{2}}{\minute}

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    \SI[fraction-function=\nicefrac,quotient-mode = fraction]{1/2}{\minute} would work if the num is only a quotient. But I have no idea how to add the "2" before it. Addition: Well \SI[fraction-function=\nicefrac,quotient-mode = fraction,product-units = single,output-product={\,}]{2x1/5}{\minute} seems to work. Oct 13 '14 at 10:06
  • 1
    But 2x1/5 is naturally mathematically dubious ... Oct 13 '14 at 10:12
  • 1
    Your solution also works perfectly @Ulrike_Fischer, but I've gone with Joseph's because of its simplicity. Oct 13 '14 at 20:30

For cases where you want to do things beyond the understanding of the siunitx internals, you can turn the parser off

\SI[parse-numbers = false]{2\nicefrac{1}{2}}{\minute}

The option fraction-function=\nicefrac option will do just that, but you'll need to load the package nicefrac and set quotient-mode = fraction as well.



    quotient-mode = fraction,

    \nicefrac{1}{3} \num{1/3}


  • This works well for numbers. I tried it with \si{\kilogram / \square \meter}, which gives different results :-(
    – Jan
    Feb 8 '19 at 7:06

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