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"Google's magic calculator" was probably just a wrapper to GNU Units [0], which produces:

  $ units
  You have: (1073741823/(600/inch))**2 / A4paper  
  You want:  
         Definition: 3.312752e+10
Equivalent tools: Qalc, Numbat

0: https://news.ycombinator.com/item?id=36994418



It couldn't have been a wrapper - it understood a tiny tiny fraction of the things that Gnu units does.




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