I'm having a hard time figuring out the LaTeX commands to define new units of year and century in siunitx.

I'd like to write \SI{3}{\cm\per\year} and have it show: 3 cm yr-1, or \SI{42}{\micro\meter\per\century} become 4.2E-5 m/century

  • 1
    You can just write \SI{3}{\cm\per yr}, pehaps you could add a little more detail to your question?
    – Seamus
    Nov 26, 2010 at 21:58

1 Answer 1


In your preamble


See the siunitx manual (v2.1 series), Section 4.5, page 12.


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