How to Calculate the weight of Steel [Bars, Sheets & Plates]??

Do you know how to calculate the Weight of Steel bars? If your answer is no, then you are in the right place. At the end of this article, you will be able to calculate the weight of steel (round bars, sheet plates) very easily. So read the full article for complete information.

But before moving to the main topic let me tell you some important properties of steel. Steel is an alloy composed of iron, carbon, and some other elements.

There is basically four grade of steel which is classified on the basis of the different amounts of carbon and other added elements composition.

How to Calculate the Weight of Steel??

The Weight of steel is calculated by using two methods which are described below-

  1. By using the Density of Steel,
  2. By using the Standard formula.

1. Density of Steel

In this method, the weight of steel is calculated by multiplying the density of the steel with the volume of steel.

The standard density of steel is 7850 kg/m3.

The formula for calculation of the volume of steel is different for different sections.

For example, if the section is rectangular in shape then the formula for volume will be l*b*t, where l= length of the section, b= breadth of the section, and t= thickness of the section.

You can refer to Fig.1 for more details on the calculation of the volume of rectangular sections.

Steel weight calculation of rectangular section

Example. Let’s suppose we have a rectangular steel section having a length of 4 m, a width of 2 m, and the Thickness is .04 m(40mm). Calculate the theoretical unit weight of the rectangular steel section?

Length = 4m
Breadth = 2m
Thickness = 0.04m

The volume of the rectangular steel section = l x b x t
= 4 x 2 x 0.04
= 0.32 m3

We know that,
Weight = Volume x Density
= 0.32 x 7850
= 2512 kg (Answer)

2. Standard formula for Steel Weight Calculation

To calculate the weight of round rebars and cylindrical sections a standard formula is used. You can refer to Fig.2 for an easy understanding of the formula.

rebar steel weight calculation formula

Example. Let’s suppose we have a round steel section having a diameter of 10mm and length of 12 m. Calculate the theoretical unit weight of the steel section?


Diameter = 10mm
Length = 12 meter
By using the standard formula
i.e. Weight = (d2/162.27) x Length
= (102/162.27) x 12
= 7.395 kg (Answer)

In this way, we can easily calculate the weight of steel having different diameters by using the same procedure.

Steel Weight Calculator



Weight in KG: 0.000

Weight in LB: 0.000

Video on how to Calculate the Weight of Steel Bars:

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