American Standard Steel Channel Size Calculator to show basic dimensions and section properties of C channels (C shapes). 

Steel channel or C channel is generally known as American Standard Channel and it's a section with two tapering parallel flanges connected by a web. Steel channels are similar to standard I beams except that with steel channels, the flanges extend on only one side of the web. Fabrication method of steel channels is generally with hot rolling. The designation of the steel channels gives information about the width and weight per unit length. For example C10 X 30 means 10 inches depth and 30 pounds per foot weight per unit length.

The dimensions of the American standard steel channels are defined in the annex of ASTM A 6/A 6M standard.

C Channel Size Calculator:

Actual Depth Weight in pounds per foot


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] ---
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 from Cog of section to outer face of structural shape [x] ---

Note: Use dot "." as decimal separator.


Link Usage
Steel C channel sizes chart Tabulated form of the steel C channel sizes.


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.


  • Oberg, E. , Jones ,F.D. , Horton H.L. , Ryffel H.H., (2016) . Machinery's Handbook . 30th edition.  Industrial Press Inc. pp 2615
  • A 6/A 6M - 05a , Standard Specification for General Requirements for Rolled Structural Steel Bars, Plates, Shapes, and Sheet Piling