Cross-Section Properties

Section Modulus Calculator

Calculate section modulus, moment of inertia, radius of gyration, and area for rectangular, circular, I-beam, box, and tube sections.

Section

Section Type

Width B (mm)

Height H (mm)

Section Properties

Moment of Inertia Ix

6666.67 ×10⁴ mm⁴

66.6667 cm⁴

Section Modulus Wx

666.67 ×10³ mm³

666.67 cm³

1666.67×10⁴

333.33×10³

Area

20000 mm²

rx (gyr.)

57.74 mm

Rect: I = BH³/12, W = BH²/6. Circle: I = πD⁴/64, W = πD³/32. Tube: I = π(D⁴-d⁴)/64. I-beam: I = [BH³ - (B-tw)(H-2tf)³]/12. Section modulus W = I/(H/2). Bending stress σ = M/W.

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