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how to calculate a tube theoretic weight

calculate steel pipe calcualte square pipe  
T.W.=(D-S)*S*24.65/1000 T.W.=(A-S)*S*31.4/1000  
calculate rectangular pipe calculater ellips pipe  
T.W.=((B+A)/2-S)*S*31.4)/1000 T.W.=[(24.65*(B-S))+(15.7*(A-B))*S]/1000  
 
T.W.=12.33*(B+A-2S)*S/1000 T.W.=[(A+(B/2*3.14))/2/2-S]*S*3.14
calculat_hexagonal_pipe Remark:
the unit in the formula:
  • length: meter
  • area: square meter
  • others: millimeter
  • weight:kgs
T.W.=24.65*(1.1*SW+1.2*S)*S/1000 T.W.=24.65*(1.06*SW+1.11*S)*S/1000