I Beam Weight Chart, Sizes & Online Calculator | MachineMFG

I Beam Weight Chart, Sizes & Online Calculator


What is I beam Steel?

Hot-rolled common I-beams, also known as steel beams, are long steel bars with an I-shaped cross-section. The specifications of I-beams include sizes like 8#, 10#, 12#, 14#, 16#, 18#, 20a, 20b, 22a, 22b, 25a, 25b, 28a, 28b, 30a, 30b, and more.

Their cross-sectional dimensions are represented by the web height (h) x web thickness (d) in millimeters. For example, an I-beam with a web height of 160mm, flange width of 88mm, and web thickness of 6mm is denoted as “I-160x88x6.” Another way to mark I-beams is by using their web height in centimeters, such as I-16#.

I-beams with the same web height but different web thicknesses and flange widths are distinguished by adding a, b, or c after the size, such as 32a#, 32b#, 32c#, etc.

Primary uses: Similar to common I-beams, they are mainly used in large structural components such as factory buildings and bridges, as well as in the manufacturing of vehicles and ships.

Specification Indication for I-Beam Steel

I Beam Standard Sizes & Weight Chart

The provided chart can be used as a reference guide for the standard sizes in mm and weight of I-beams in kg.

1. Ordinary Hot Rolled I Beam Sizes & Weight Chart

Flange Width
Web Thickness
Theoretical Weight

2. Light Duty Hot Rolled I Beam Sizes & Weight Chart

Flange Width
Web Thickness
Theoretical Weight

I Beam Sizes Chart PDF Download:

I Beam Weight Calculator

However, it’s important to note that there may be a certain degree of discrepancy between the theoretical weight and the actual weight. The theoretical weight provided by our calculator may differ from the actual weight, with an error range of about 0.2% to 0.7%. Therefore, when making precise calculations or transactions, it’s best to adjust the results based on the actual situation.

Related reading:

What Are the Differences in the Theoretical Weight of I-Beams Made From Different Materials (Such as Q235, Q345, Etc.)?

The theoretical weight of I-beams made from different materials (such as Q235, Q345, etc.) varies, primarily due to their differing alloy contents. Q235 is ordinary carbon steel, while Q345 is low alloy steel. This means that Q345 contains more alloy elements than Q235, which can enhance the strength, toughness, and other properties of the steel.

Therefore, due to the difference in alloy content, the theoretical weight of Q345 is usually heavier than that of Q235.

For the calculation formula, the theoretical weight of the I-beam can be calculated using the formula W = 0.00785 [hd +2t (bd) +0.615 (r2 r12)], where W represents the theoretical weight (in kg/m), h is the height, b is the leg length, d is the waist thickness, t is the average leg thickness, r is the inner arc radius, and r1 is the end arc radius.

This formula applies to I-beams of different materials, but in actual calculations, the density value will vary due to the material difference. For example, the density of low carbon steel (like Q235) is calculated as 7.85g/cm3, while the density of stainless steel might be slightly lower.

The difference in the theoretical weight of I-beams made from different materials is primarily due to their different alloy contents. Although the specific theoretical weight needs to be determined according to the specific dimensions and material characteristics of the I-beam through the calculation formula, generally speaking, the theoretical weight of low alloy steel (like Q345) will be heavier than that of ordinary carbon steel (like Q235).

How to Choose the Right I-Beam Specification and Model According to Different Application Scenarios, Such as Construction and Mechanical Manufacturing?

Choosing the appropriate I-beam size and model requires understanding the basic parameters and application scenarios of the I-beam. The specifications of the I-beam can be represented by its height/depth (h), width (b), and weight or mass (w). Additionally, the model of the I-beam can also be represented by the number of centimeters in the waist height, for example, I16# represents an I-beam with a waist height of 160mm.

In different application scenarios, such as construction and mechanical manufacturing, the selection of I-beams also needs to consider its mechanical properties and size range. For instance, the weight of the 18# national standard I-beam should be between 39.2-79.5kg/m with a size range of 100-400mm, suitable for scenarios requiring larger bearing capacity and a certain length. The model standards of European standard I-beams are mainly distinguished based on their cross-sectional sizes and belly plate heights, with common models including IPE80, IPE100, etc., suitable for scenarios with specific shape and size requirements.

For cantilever structures, the selection of I-beams also needs to consider thickness as it directly impacts the stability and safety of the cantilever structure. Furthermore, the selection of I-beams must comply with relevant national standards and regulations to ensure their safe and reliable performance.

When choosing the appropriate I-beam size and model, it’s essential to take into account the specific application scenario, the required bearing capacity, the stability of the structure, as well as the relevant standards and regulations to be complied with. For example, in building structures, you might need to choose I-beams with larger bearing capacity and specific size range, while in fields like mechanical manufacturing, the shape and size of the I-beam to fit specific design requirements might be more emphasized.

The Difference Between Standard and Light I-Beams

Standard I-beams are processed from regular steel, while light I-beams are made from lightweight alloys such as aluminum and magnesium. When compared to standard I-beams, light I-beams have wider flanges and thinner webs and flanges. Given the same depth, light I-beams offer better stability while ensuring the same load-bearing capacity, thus saving metal and providing better economic efficiency.

Regardless of whether they are standard or light, I-beams tend to have relatively high and narrow cross-sectional dimensions, resulting in a significant difference in the moment of inertia about the two main axes.

Therefore, they are typically used directly for members subjected to bending within the plane of their web or as part of a lattice force member. When used individually, they can only serve as general bending members and eccentric compression members, such as secondary beams or eccentric columns in work platforms.

However, when used as composite sections, they can function as the main compression members.

I-beams come in standard and light varieties.

Compared to the same model of standard I-beam, light I-beams have a smaller thickness and lighter weight. The flange width varies with the model size: smaller models (I32# and below) have narrower flange widths than standard I-beams, while larger models (I40# and above) have wider flange widths.

How useful was this post?

Click on a star to rate it!

Average rating 4.3 / 5. Vote count: 6

No votes so far! Be the first to rate this post.

As you found this post useful...

Follow us on social media!

We are sorry that this post was not useful for you!

Let us improve this post!

Tell us how we can improve this post?

11 thoughts on “I Beam Weight Chart, Sizes & Online Calculator”

    1. Hello, my name is Nelson:
      I want to build a 2 ton gantry with a span of 10 ft. How tall and thickness does an I beam has to be.

  1. Good morning

    i Whant to build a 5 ton single Girder gantry crane, what size I beam should i need for the top main beam and what size beam can i use for the legs.

    thank you in advance


  2. erlinda budoyan

    Hi can youmplease help. I am building Root cellar 20ftx30ft and on top of it a church for 150people including children can you please give me idea what Ibeam or Hbeam should I used on the rootcellar that can also carry a worshipper 150 more or less? how many post Appreciate much your reply.

    All the best


    [email protected]

  3. Syed Sitwat Hasan

    Nneed to calculate load carrying capacity of an I Beam Flange 4″ X Web 6″ thickness 8MM, Length 28′, vertically support structure? Thnx in advance

Leave a Comment

Your email address will not be published. Required fields are marked *

Scroll to Top