How do I convert grit finish to Ra finish?

Below is a table cross referencing grit finishes with Ra finishes:

 US  Ra  Ra  UK
 GRIT  µ inch
 µm
 GRIT
   125  3  120
   85  2  180
 80  70  1.65  
   50  1.5  240
   30  0.75  320
 180  25  0.62  
 240  18  0.45  
   15  0.40  500
 320  10  0.25  




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