American Standard Steel Channel Size Calculator has been developed to show basic dimensions and sectional properties of steel 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.


Actual Depth Weight in pounds per foot


Structural Steel Shapes - W Shape
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 ---
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.


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., (2012) . Machinery's Handbook . 29th edition.  Industrial Press Inc., pp 2594 - 2597
  • A 6/A 6M - 05a , Standard Specification for General Requirements for Rolled Structural Steel Bars, Plates, Shapes, and Sheet Piling