**D^2/162.2**

**Its follows as
:**

Weight of steel bar per meter = Area of the steel x Density of steel x Bar length

= (3.14 x D^2/4)
x 7850 kg/㎥^{ } x 1m

= (D^2^{ }x
6162.25)/(1000 x 1000)

= D^2 x (0.006162)

= D^2 x 1/(0.006162)^-1

= D^2/162.28

**For easy calculation in problem solving or calculations we use
this formula:**

Unit weight of Steel Bar
(in Kgs) = D^2/162

Where, D is the Diameter
of the Steel Bar in mm.

**Remember:**

To calculate the unit weight, length “L’ becomes unity.

**Weight of Steel
Bar = [ ****D^2**** ^{ }L / 162.28] **in Kg and Length ‘L’ in
m

**Weight of Steel Bar** = **[ ****D^2**** ^{ }L
/ 533] **in Kg and Length ‘L’ in foot

Here, the density of steel is taken as 7850kg/m^{3}.
A mild steel round bars are specified by their diameters in millimeters(mm).

Unit Weight of Different Building Materials

**For MS Flat Bar**

Weight of steel Flat bar = (Length
x width x thickness) x 7850

For example:

MS Flat bar of width = 50mm

Thickness = 30mm.

As we know,

Weight of steel bar = Volume of steel
Bar x Density of steel

Weight of steel bar =
(Length x width x thickness) x 7850

Unit Weight of steel bar
= (1 x .050 x .030) x 7850

= 11.775 kg/m

**Note:**

If
you are calculating the weight of circular steel bar then calculate its volume
by using this formula (Ï€D^2/4) and then just multiply by the density
of steel which is **7850 kg/****㎥**

**For circular Steel Rods**

Formula for Unit weight of steel = D^2/162 kg/m

For example:

If we want to calculate the unit weight of 10mm steel rod of 1-metre height,

Weight of steel = 10^2/162

= 0.617 kg/m x 1m

= 0.617 kg

So, 1- metre of
10 mm steel weighs around **0.617 kg.**

At site,The steel is usually brought in the big troller and the rod length is about 12 metres.

So, if you want to calculate for 12 metre rod,then

Unit weight of
steel for 10 mm steel rod is 0.617 kg

For 12 m=12
x0.617=7.40 kg

So, 12 m long
rod of 10mm dia weighs around **7.40 kg**

**Hence, the weight of** :

8mm dia bar = (8x8x1)/162 = 0.395 kg

10mm dia bar = (10x10x1)/162= 0.617 kg

12mm dia bar = (12x12x1)/162= 0.89 kg

16mm dia bar = (16x16x1)/162= 1.58 kg

20mm dia bar = (20x20x1)/162= 2.47 kg

25mm dia bar = (25x25x1)/162= 3.86 kg

32mm dia bar = (32x32x1)/162= 6.32 kg

The table below shows the unit weight of different diameter bars in kg/m

The weight of the steel bar can be
calculated in two ways: by **Density** of steel or by **Formula.**

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