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    Table of Contents

    Steel i-section beams are a constant in the modern construction of buildings. Characterised by their distinct ‘I’ shape, these steel beams have its weight distributed evenly, ensuring structural integrity. Compared to their counterpart, H-Beams with wider flange, I-beams are more tapered, making them suitable for use in applications requiring less width. Here, we’ll take a look at I-beam weight chart based on the different I-Beam sizes (length, width and density), to enable you to plan and estimate the total number of I-beams needed for your project.

    Disclaimer: This is a basic guide explaining how to calculate I-beam weight using the standard formula. The i-beam weight charts are only for refence/information and your understanding. You should consult your steel manufacturer for exact weight chart and dimensions.

    I-Beam weight chart

    Understanding the weight and structural applications of I-beams is crucial for planning. While you can get specifics using an I-beam weight calculator, this rough I beam weight chart in kg listed below will provide you with guidance and act as a reference point for your engineering projects.

    Also read: MS Flat weight chart – How to calculate MS flat bar weight

    Chart 1

    Here, we will have a look at how the weight of i-beams vary based on the dimensions of the Flange width and Web height, when other dimensions are constant.

    Flange width Flange thickness Web thickness Web height Length I-beam weight (total) Weight per foot
    50 mm 10 mm  15 mm 100 mm 4 m 78.5 kg 5.98 kg
    70 mm 10 mm 15 mm 125 mm 4 m 102.84 kg 7.84 kg
    125 mm 10 mm 15 mm 250 mm 4 m 196.25 kg 14.95 kg
    140 mm 10 mm 15 mm 400 mm 4 m 276.32 kg 21.06 kg
    150 mm 10 mm 15 mm 450 mm 4 m 306.15 kg 23.33 kg
    180 mm 10 mm 15 mm 500 mm 4 m 348.54 kg 25.56 kg
    210 mm 10 mm 15 mm 600 mm 4 m 414.48 kg 31.58 kg

    *This is not standard dimensions and weight of i-section beams and is for information only. Kindly check with your steel manufacturer for exact dimensions and weight.

    Chart 2

    Here, we will have a look at i-section beam weight based on the Web height.

    Remember, the thickness of the flanges has to be deducted from the height of the Web during weight calculation. Here the numbers represent Web thickness excluding the thickness of the flanges.

    That is, for the dimensions in Row 1, if Flange thickness is not deducted, effective Web height would be = 100 mm – (2 x 15 mm) = 70 mm

    Flange width Flange thickness Web thickness Web height Length I-beam weight (total) Weight per foot (kg/ft)
    210 mm 15 mm 12 mm 100 mm 10 m 160 kg 5.2 kg
    210 mm 15 mm 12 mm 125 mm 10 m 200 kg 6.5 kg
    210 mm 15 mm 12 mm 250 mm 10 m 400 kg 13 kg
    210 mm 15 mm 12 mm 400 mm 10 m 640 kg 20.8 kg
    210 mm 15 mm 12 mm 450 mm 10 m 720 kg 23.4 kg
    210 mm 15 mm 12 mm 500 mm 10 m 800 kg 26 kg
    210 mm 15 mm 12 mm 600 mm 10 m 960 kg 31.2 kg

    *This is not standard dimensions and weight of i-section beams and is for information only. Kindly check with your steel manufacturer for exact dimensions and weight.

    Chart 3

    In the third steel i-beam weight chart, we consider how the weight of the beams change based on the Length of the beams.

    As you will note, though the i-beam sizes vary (i.e., length), there is no change in the steel I beam weight by kg/foot. This is because per foot weight is not dependent on the length here since all the other dimensions are constant.

    Flange width Flange thickness Web thickness Web height Length I-beam weight (total) Weight per foot (kg/ft)
    125 mm 10 mm 12 mm 250 mm 4 m 348 kg 28.67 kg
    125 mm 10 mm 12 mm 250 mm 6 m 522 kg 28.67 kg
    125 mm 10 mm 12 mm 250 mm 8 m 696 kg 28.67 kg
    125 mm 10 mm 12 mm 250 mm 10 m 870 kg 28.67 kg
    125 mm 10 mm 12 mm 250 mm 12 m 1044 kg 28.67 kg
    125 mm 10 mm 12 mm 250 mm 16 m 1392 kg 28.67 kg
    125 mm 10 mm 12 mm 250 mm 18 m 1566 kg 28.67 kg

    *This is not standard dimensions and weight of i-section beams and is for information only. Kindly check with your steel manufacturer for exact dimensions and weight.

    Also read: How to calculate chequered plate weight

    How to calculate I-beam weight?

    Now that we have seen a sample of I-beam weight chart in kgs, let’s understand how to calculate weight of I-beam.

    Calculating the weight of steel I-beam is simple with the formula:

    Weight per meter = Volume x Density

    Volume: To find this, we will have to multiply the cross sectional area by its length

    Cross sectional area: This refers to the beam’s Webs and Flanges

    Web: The central vertical section

    Flanges: The horizontal plates on the top and bottom

    Together this gives the beams its unique I-shape and contributes to the beam’s strength and weight.

    I section beam

    Example of i beam weight calculator

    Let’s take an example to calculate weight of a standard I-beam. Here:

    Flange width = 150 mm

    Flange thickness = 15 mm

    Web thickness = 10 mm

    Web height = 300 mm (height of the web excluding the flange thickness)

    Length of the beam = 8 m or 8000 mm

    Density of steel = 7850 kg/m³

    Steps to I-beam weight calculator

    Step 1:

    Cross sectional area (A) = (Flange width x Flange thickness x 2) + (Web height x Web thickness)

    = (150 mm x 15 mm x 2) + (300 mm x 10 mm)

    = 4500 mm² + 3000 mm²

    = 7500 mm²

    Step 2:

    Volume (V) = A x Length

    = 7500 mm² x 8000 mm

    =60,000 mm³

    Convert Volume to Cubic metres

    V = 60,000 mm³ / 1,00,000,000

    = 0.060 m³

    Step 3:

    Weight = Volume x Density

    = 0.06 m³ x 7850 kg/m³

    = 471 kg

    Total weight of an I-beam = 471 kg

    Now that we understand how to calculate weight of I-beams, let’s look at some popular i-beam sizes and how much they weigh.

    I beam weight calculator

    What is the weight of I beam 175mm?

    For a standard 175 mm I-beam width, the weight will vary based on its width, height and length.

    I beam weight chart in kg (changing Web height):

    Flange width Flange thickness Web thickness Web height Length I-beam weight
    175 mm 20 mm 10 mm 100 mm 6m 376.8 kg
    175 mm 20 mm 10 mm 200 mm 6m 423.9 kg
    175 mm 20 mm 10 mm 300 mm 6m 471.0 kg
    175 mm 20 mm 10 mm 400 mm 6m 518.1 kg

    *For information and reference only. Please check with your steel provider for exact weight details.

    Note: When we speak of weight of i-beam 175mm, it usually refers to H-beam weights.

    What is the weight of 300 x 140 i beam?

    The weight of an i-section beam is determined by the dimensions of the Web and Flanges. So, for 300 mm x 140 mm i-beam size, it means Web height/width is 300 mm and Flange width is 140 mm.

    I beam weight chart in kg (L= 6m, 8m, 10m, 12m)

    Flange width Flange thickness Web thickness Web height Length I-beam weight
    140 mm 20 mm 10 mm 300 mm 6 m 405.06 kg
    140 mm 20 mm 10 mm 300 mm 8 m 540.08 kg
    140 mm 20 mm 10 mm 300 mm 10 m 675.10 kg
    140 mm 20 mm 10 mm 300 mm 12 m 810.12 kg

    *For information and reference only. Please check with your steel provider for exact weight details.

    Also read: TMT bar unit weight calculation

    How heavy is a 20ft I-beam?

    The weight of a w0 ft i-beam will vary based on its other dimensions. In the weight chart below, we have tried to show how the weight varies when the Flange width and Web thickness differs.

    Flange width Flange thickness Web thickness Web height Length I-beam weight (total) Weight per foot
    75 mm 15 mm 85 mm 200 mm 20 ft 921.18 kg 46.06 kg
    100 mm 15 mm 90 mm 200 mm 20 ft 1004.93 kg 50.25 kg
    150 mm 15 mm 85 mm 200 mm 20 ft 1028.85 kg 51.44 kg
    250 mm 15 mm 90 mm 200 mm 20 ft 1220.27 kg 61.01 kg

    *For information and reference only. Please check with your steel provider for exact weight details.

    Also read: Steel bar weight chart

    How do I choose an i-Beam size?

    We have looked at different I beam weight charts and its calculations for your reference. It will help you to understand the different parts of an i-beam and how the dimensions of each part impact the overall weight. You will however need to check with your steel supplier or manufacturer on the actual weight based on I beam sizes.

    Before we close, here are some simple tips to keep in mind when you choose an I section beam size for your construction project:

    • Assess the load the i-beam will support (i.e., dynamic or static load, magnitude and load distribution along the beam)
    • Consider the length span requirements (i.e., longer spans require deeper i-beams)
    • Refer to a steel I beam weight calculator to find a balance between depth and weight (i.e., more the depth, greater its load bearing capabilities; thicker Web and Flanges can resist high stress and bending)
    • Use an i-beam weight chart or weight calculator for precision and to check the beam’s compatibility with the requirements of your project
    If you are looking to buy steel at the best prices, you’ve come to the right place. At Tata nexarc, we have partnered with leading steel providers in India and offer steel across multiple brands and types in one place. You can also get credit facility and timely door-step delivery. To get a quote, contact us now.

    *Disclaimer: This article is for information and reference only. For standard i-beam sizes, ISMB weight chart, and more please consult your steel manufacturer.

    Sohini Banerjee

    Sohini is a seasoned content writer with 12 years’ experience in developing marketing and business content across multiple formats. At Tata nexarc, she leverages her skills in crafting curated content on the Indian MSME sector, steel procurement, and logistics. In her personal time, she enjoys reading fiction and being up-to-date on trends in digital marketing and the Indian business ecosystem.