Aluminum C Channel Size Calculator has been developed to show basic dimensions and sectional properties of extruded Aluminum Association Channels. 

Standard aluminum channel is a structural shape which is fabricated with extrusion. Top and bottom plates of a channel are named as flanges and the vertical plate which connects the flanges is named as web.

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


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


Aluminum Association Standard Structural Shapes - Channels
Parameter Symbol Value Unit
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 ---
Distance to centroid in X direction x ---

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.