area
Hollow Rectangle Moment of Inertia Calculator
Explore area moments for hollow rectangular sections using outer and inner dimensions.
Hollow Rectangle Moment of Inertia Calculator
Define your section
Hollow rectangle / box section
Outside horizontal dimension
Outside vertical dimension
Opening width
Opening height
Calculated properties
Ix = (BH³ − bh³)/12; Iy = (HB³ − hb³)/12- Assumes a centred rectangular opening.
Length inputs are converted to millimetres for calculations. Review the assumptions before using results in engineering work.
About this calculation
Enter the required dimensions and select the appropriate length unit. The calculator displays results based on the selected calculation and its stated assumptions.
Moment of inertia and related section properties depend on the geometry, reference axes, units, and assumptions used. Review the displayed formula and assumptions before using any result.
These tools are intended for educational and preliminary engineering calculations. Independently verify critical results before using them in engineering design or safety-related work.
Calculation methodology
Learn about formulas, units, assumptions, and calculation limitations in our calculation methodology.