I Beam Steel Weight Calculation Formula | Steel Weight Calculator

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I Beam Steel Weight Calculation Formula is quite easy. So if you want to calculate the weight of I Beam Steel, you can simply follow the I Beam weight calculation formula below or simply download the Steel Weight Calculator Free Download for Building Structure.

I beam is kind of structural steel beam which is used for building beams. It is used mostly in the industrial area, for factory or warehouse buildings. Top and bottom plates of a I beam are named as flanges and the vertical plate which connects the flanges is named as web. Different dimensions of I beam exist in the market and can be supplied by the beam suppliers. 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.

I Beam Steel Weight Calculation Formula

I beam section - I Beam Steel Weight Calculation Formula

Input Parameters

Flange-flange inner face heightH (mm)
WidthB (mm)
Flange thicknessh (mm)
Web thicknessb (mm)
LengthL (mm)
Densityρ (g/cm^3)

List of Equation /Formula

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1Cross section areaA (mm^2)A = 2Bh + Hb
2Area moment of inertiaIxx (mm^4)Ixx = H3b/12 + 2[h3B/12 + hB(H+h)2/4]
3Area moment of inertiaIyy (mm^4)Iyy = b3H/12 + 2(B3h/12)
4Section modulusSxx (mm^3)Sxx = 2Ixx/(H + 2h)
5Section modulusSyy (mm^3)Syy = 2Iyy/B
6Center of gravityxcog (mm)xcog=B/2
7Center of gravityycog (mm)ycog=H/2 + h
8MassM (kg)M = ALρ
9Radius of gyrationr (mm)r = (I/A)^0.5
10Polar moment of inertiaJ (mm^4)J = Ixx + Iyy


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

Radius of Gyration (Area) definition is 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 definition is 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.

I Beam Steel Weight Calculation Formula above is used for metric unit system. If you want to switch it to inch system, you can refer to CONVERSION FACTORS FROM ENGLISH TO SI UNITS or CONVERSION FACTORS FROM SI TO ENGLISH UNITS. If you are interested in more related articles, please subscribe.

See Also :

Steel Weight Calculator Free Download for Building Structure

Oberg, E., Jones, F. D., Horton, H. L., & Ryffel, H. H. (2012) . Machinery’s Handbook . 29th edition.  Industrial Press Inc., pp 234 – 256

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