Square Tube Moment of Inertia Calculator

Square Tube Moment of Inertia Calculator

The moment of inertia (I) represents the resistance of a square tube against bending deformation.

A higher moment of inertia value indicates:

  • Higher bending resistance
  • Better structural stiffness
  • Improved load-bearing performance

Because square tubes have almost identical moments of inertia around both axes, they provide balanced bending performance in horizontal and vertical directions.

Applicable Standards

  • ASTM A500 Square Tube
  • EN 10219 SHS
  • AS/NZS 1163 Hollow Section

Square Tube Moment of Inertia Calculator

Calculate the moment of inertia (I) of square steel tubes based on outer size and wall thickness.

Calculation Formula

I = (B⁴ − (B−2t)⁴) / 12

Where:

  • I = Moment of inertia (mm⁴)
  • B = Outer side length of square tube (mm)
  • t = Wall thickness (mm)

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