This error suddenly appeared in my file! It was not before what should I do?

File `calc.sty' not found. \RequirePackage

  • 4
    The calc package is part of required tools bindle so should be available in every latex installation. If you are using miktex then update latex-tools in the miktex console Jan 19, 2021 at 20:51
  • 2
    If you are using miktex this is most likely a duplicate of tex.stackexchange.com/questions/578956/… Jan 19, 2021 at 20:52

1 Answer 1


I'm not expert but I try this and worked.

Copy all in this link: https://web.mit.edu/ghudson/dev/nokrb/third/tetex/texmf/tex/latex/tools/calc.sty

Paste in a note block and save as calc.sty where is save your .tex file

  • 2
    Welcome to TeX.SE. This would solve OP's problem, but wouldn't really address the underlying issue that TeX isn't finding a package that should be somewhere on OP's computer.
    – Teepeemm
    Nov 5, 2021 at 15:46

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