Cotton Quality
Staple conversion chart

 

categoryinches32ndsdecimals USDA Upland   HVI length USDA Am Pima
HVI length    
mm
short 13/16" 26 0.8125 0.80-0.85   20.64  
  27/32" 27 0.84375     21.43  
  7/ 8" 28 0.875 0.86-0.89   22.23  
  29/32" 29 0.90625 0.90-0.92   23.02  
  15/16" 29 0.9375 0.93-0.95   23.81  
medium 31/32" 31 0.96875 0.96-0.98   24.61  
  1" 32 1.0 0.99-1.01   25.40  
  1. 1/32" 33 1.03125 1.02-1.04   26.19  
  1. 1/16" 34 1.0625 1.05-1.07   26.99  
  1. 3/32" 35 1.09375 1.08-1.10   27.78  
medium 1. 1/ 8" 36 1.125 1.11-1.13   28.58  
to long 1. 5/32" 37 1.15625 1.14-1.17   29.37  
  1. 3/16" 38 1.1875 1.18-1.20   30.16  
  1. 7/32" 39 1.21875 1.21-1.23   30.96  
long 1.  1/ 4" 40 1.25 1.24-1.26 -1.20 31.75  
  1. 9/32" 41 1.28125 1.27-1.29   32.54  
  1. 5/16" 42 1.3125 1.30-1.32 1.21-1.25 33.34  
  1.11/32" 43 1.34375 1.33-1.35   34.13  
  1.  3/ 8" 44 1.375 1.36 1.26-1.31 34.93  
  1.13/32" 45 1.40625     35.72  
extra 1. 7/16" 46 1.4375   1.32-1.36 36.51  
long 1.15/32" 47 1.46875     37.31  
  1.  1/ 2" 48 1.5   1.37-1.42 38.10  
  1.17/32" 49 1.53125     38.89  
  1. 9/16" 50 1.5625   1.43-1.47 39.69  
  1.19/32" 51 1.59375     40.48  
  1.  5/ 8" 52 1.625   1.48 + 41.28  
  1.21/32" 53 1.65625     42.07  
  1.11/16" 54 1.6875     42.86  
  1.23/32" 55 1.71875     43.66  
  1.  3/ 4" 56 1.75     44.45