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# Rectangular tube

Calculate the second moment of area (also known as moment of inertia of plane area, area moment of inertia, or second area moment) and the section modulus of a profile with rectangular cross section, width A, height B and wall thickness C. Use this to calculate deflection or tension in a loaded profile.

$$I_{yy} = \dfrac {AB^{3}-(A-2C)(B-2C)^{3}}{12}$$

$$W_{yy} = \dfrac {AB^{3}-(A-2C)(B-2C)^{3}}{6B}$$