Volume of Steel Bar (Cu.m) = Area of Steel Bar (sq.mtr) X Length of Steel Bar (m) Since We are trying to calculate the unit weight of Steel Bar, the length of Steel Bar in the calculation would be 1 m or 1000 mm. Area of Steel Bar = (3.14 X D^2)/4 Density of Steel Bar = 7850 Kgs/Cu.m = 7850/ (1000X1000X1000) Cubic mmSo considering these data in ...