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Ducting
First of all inorder to select guage for a GI duct there are SMACNA standards for guage selection.
0-450mm=24 guage (0.6mm)
451mm-900mm=22 guage (0.8mm)
901mm-1219mm=20 guage (1.0 mm)
1220mm-3048mm=18 guage (1.2mm)
Now if you want to calculate the duct quantity in sqm then,
A=2(W+H)xL (Sq.m)
where
A=Area of the duct (sq.m)
W=width of the duct(m)
H=Height of the duct(m)
L=Length of the duct(m)
volume = Area * length of duct .It can be described in Sq.Mts or Kgs.