We can calculate the weight of this I – section in the same way as we calculated for U – section

Here, we will have to know the outer and inner edge dimensions.

Volume of the I – section = cross-sectional area × Length

V = A × L = (( X_{1} × Y_{1} ) – 2 × ( x_{2} × y_{2} )) × L

Where X_{1 }is outer edge width, Y_{1} is outer edge height and x_{2} is inner edge width, y_{2 }is inner edge height.

Let us consider a 1 m long I – section of outer edge width 60mm = 0.060m, outer edge height = 80 mm = 0.080 m and inner edge width 25 mm = 0.025 m , inner edge height = 40 mm = 0.040 m.

So, Volume of the I section = [ (0.060 × 0.080) – 2 × (0.025 × 0.040) ] × 1 = 0.0028 m^{3}

Hence, mass of the I section = density × volume = 7900 × 0.0028 = 22.12 kg

In this way we can calculate the mass of an I section with different dimensions.