TPM  =  TPI x 39.37      TPI =  TPM x 0.0254       TPM = Twists per meter     TPI =  Twists per inch

SPINNING :     TPI  = Twist Multiplier (TM) x √ Ne    or    TM x √ Hank         TPM  =  Tex Twist Factor / √Tex

RKM value   =   Single Yarn Strength in gm       =      Lea CSP

                                      Yarn Tex                                          150

Yarn length in Meters  =  1693 x Count in Ne x Weight in Kgs   =   1.693 x Count in Ne x Weight in gms

Yarn count Ne  =    Yarn length in Meters           =    Yarn length in Meters

                               1693 x Weight in Kgs               1.693 x Weight in gms

Hank of  Sliver or Roving   =  Sliver or Roving length in meters

                                                       1.693 x Weight in gms

WRAPPING

YARN COUNT AND  SLIVER & ROVING HANKS

YARN COUNT  Ne   =                  64.81

                                       120 yards yarn weight in gms

SLIVER HANK     =                        3.24

                                        6 yards Sliver weight in gms

ROVING HANK      =                           8.1

                                            15 yards Roving weight in gms

Yarn diameters in inches   =  1 / (28 √Ne)

Resultant count ( N ) of two ply yarns (English count system ) N  = ( N1  x  N2 )  /  ( N1 + N2 )  

Yarn contraction % due to Twist  =  2.67 x TM – 4.93

Untwisted Yarn Count  =  ( 100 x Twisted Yarn Count ) / ( 105 – 2.67 x TM )