Convert area moment of inertia units including inches to the fourth, feet to the fourth, millimeters to the fourth, centimeters to the fourth, and meters to the fourth for beams, joists, steel shapes, wood members, deflection checks, and structural estimates.
Inches to the fourth to millimeters to the fourth:
1 in⁴ = 416,231.425 mm⁴
Feet to the fourth to inches to the fourth:
1 ft⁴ = 20,736 in⁴
Centimeters to the fourth to inches to the fourth:
1 cm⁴ = 0.00240251 in⁴
Meters to the fourth to inches to the fourth:
1 m⁴ = 2,402,509.61 in⁴
Moment of inertia conversions are useful for beams, joists, rafters, steel shapes, wood members, aluminum shapes, deflection checks, stiffness comparisons, section tables, and structural calculations.
Use this converter when switching between imperial and metric area moment of inertia units for construction and engineering references.
Your result shows the entered area moment of inertia converted from the starting unit into the selected ending unit. The converter also shows common equivalent values in in⁴, ft⁴, mm⁴, cm⁴, and m⁴.
This converter changes moment of inertia units only. It does not determine whether a beam is safe. Structural design depends on span, loading, support conditions, material strength, section modulus, deflection limits, bracing, connections, and code requirements.
Area moment of inertia is a geometric property used to compare how a shape resists bending and deflection.
Multiply inches to the fourth by 416,231.425. For example, 10 in⁴ equals about 4,162,314.25 mm⁴.
Area moment of inertia uses length to the fourth power units, such as in⁴, ft⁴, mm⁴, cm⁴, or m⁴.
No. Moment of inertia is measured in length to the fourth power. Section modulus is moment of inertia divided by the distance to the extreme fiber.
No. This converter only changes moment of inertia units and gives an optional section modulus reference when a distance is entered.