Aluminum I Beam Size Calculator  to show basic dimensions and section properties of extruded Aluminum Association I beam. 

Standard aluminum I Beam is a structural shape which is fabricated with extrusion. Top and bottom plates of a I Beam are named as flanges and the vertical plate which connects the flanges is named as web. Due to its shape, I beam has high moment of inertia and stiffness which makes it resistant to bending moments. The web provides resistance against shear forces. These beams are not resistant to torsional loading (twisting) and they shall not used in the cases where torsion is dominant.

Structural sections are available in 6061-T6 aluminum alloy which has good corrosion resistance and material strength.

Aluminum I Beam Section Properties Calculator:

Aluminum Association Standard I Beam
(Depth x Weight)
(in x lb/ft)


Structural Steel Shapes - W Shape
Parameter Value
Designation --- ---
Weight per unit length [W] --- lb/ft
Cross section area [A] --- in^2
Depth [d] --- in
Web thickness [tw] ---
Flange width [bf] ---
Flange thickness [tf] ---
Fillet radius [R] ---
Second moment of area [Ixx] --- in^4
Second moment of area [Iyy] ---
Section modulus [Sxx] --- in^3
Section modulus [Syy] ---
Radius of gyration [rx] --- in
Radius of gyration [ry] ---

Note: Use dot "." as decimal separator.


Designation system for aluminum alloys: The designation system was established by The Aluminum Association. A four digit number is assigned to each aluminum alloy. (Ex: 6xxx)

6xxx: Alloys which contain magnesium and silicon that form magnesium silicide (Mg2Si). Alloys have a good compromise of corrosion resistance and material strength. Al6061 is one of the most popular of all aluminum alloys and its a yield strength is comparable to mild carbon steel. The 6xxx series alloys are used for the majority of extrusions produced. Alloys can be heat-treatable.

Extrusion: A fabrication method where solid metals are forced through a die to form a complex shape.

Temper Designation: The designation for the temper is done with letters. T means thermally treated, O means annealed, H means strain-hardened.

Second Moment of Area: The capacity of a cross-section to resist bending.

Radius of Gyration (Area): The distance from an axis at which the area of a body may be assumed to be concentrated and the second moment area of this configuration equal to the second moment area of the actual body about the same axis.

Section Modulus: The moment of inertia of the area of the cross section of a structural member divided by the distance from the center of gravity to the farthest point of the section; a measure of the flexural strength of the beam.


Link Usage
Aluminum Standard I Beam Sizes Section Properties Table Tabulated form of aluminum I beam sizes calculator