Moment of Inertia (Area)

Calculate the second moment of area for rectangular and circular sections.

Cross-Section

Dimension 1 — width b / diameter D (mm)

Dimension 2 — height h / inner diameter d (mm)

About this calculator

Rectangle: I = b·h³ ÷ 12. Solid circle: I = πd⁴ ÷ 64. Hollow circle: I = π(D⁴ − d⁴) ÷ 64. Enter dimensions in millimetres.