The weight of steel Calculation

The weight of steel calculation is very important, but before calculating weight it is important to properly understand the properties of steel. In the steel, the carbon is between 0.002 % to 2.14 % by its own weight of the steel. The carbon ratio value of steel may vary and it depends on which steel alloying element is going using such as carbon, nickel, chromium, manganese, iron and other alloying elements.

Basically Iron with alloy carbon present in the steel, which doesn’t undergo any eutectic reactions but cast iron always undergoes in eutectic reaction. If the carbon content is too low present in the steel. The iron will be soft, weak and also very ductile in their properties.

As we mention early the carbon will be in the weight of steel up to 2.14 % on its own weight. The weight of steel bars can be calculated theoretically as well as physically. In this article, we are going to discuss theoretical methods. The weight of the steel bar can be calculated in two ways.

  1. By Density of steel
  2. By Formula


It is very important to know the unit weight of steel bars as well as rectangular steel plates, in kilograms and in Tons. The given below formula is most commonly used in the calculation of rectangular steel plate weight calculation. Note: The Density of steel is 7850 kg/m³



 Weight = Volume X Density

EXAMPLE: Let’s suppose we have a rectangular steel plate having a Length 1 m or Width 0.5 m the Depth (Thickness) is 0.3 m. To calculate the theoretical unit weight of a rectangular steel plate?

Given Data:

Length       = 1 m (1,000 mm)

Width        = 0.5 m (500 mm)

Thickness = 0.3 m (300 mm)


First calculate the volume of the steel sheet.

Volume = (L x W x T)

= 1 m x 0.5 m x 0.3 m

= 0.15 m^3.

Weight = Volume x Density

= o.15 x 7850

= 1177.5 kg. Ans..

Note: If you are calculating the weight of circular steel reinforcement bar than calculate its volume by using this formula (πD^2/4) and then just multiply by the density of steel which is 7850 kg/m^3.


To calculate the weight of circular reinforcement bars etc. The given below formula is most commonly used at site level steel weight calculation which is.


Weight = (D²/162) x Length

Example: Let’s Suppose we have circular reinforcement bar which having a diameter (D) 12 mm and having a Length 10 m.

1. So calculate the weight of circular reinforcement bar?

Given Data:

Diameter = 12 mm

Length      = 10 m


By using the steel weight formula put the given values.

Weight = (D²/162) x Length

= (12 x 12/162) x 10

= 8.8 kg Ans…

So the 10-meter long bar has a diameter 12 mm its weight will be 8.8 kg. So in this way, we can calculate the theoretical weight of steel at the site.

Note: If the properties of the steel changed its physical weight will also be changed.

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