Whats Is Unit Weight Of Steel?

Diameter and length of steel bars are structural requirements of a building, and they are decided based on design procedures given by IS (Indian Standard) codes. Steel bars are sold in the market in price per weight. So we need to calculate the weight of steel required to estimate cost of construction. In this article, you will learn how to calculate unit weight of steel bar dia 8mm and others easily!

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The formula D²L/162 is very common and used frequently to calculate the weight of steel bars. In this post, the simple derivation behind this formula is discussed. I hope you will enjoy it.

1. How To Calculate Steel Bar Per Foot In KG?

A. Steel Bar Weight Formula # 01

W= (#) 2 / 24

Where,

W = Weight of steel in lbs
#Dia of steel in sood
Steel Bar Weight Formula # 02

B. Steel Bar Weight Formula # 02

W=D²L/162

Where,

W = Weight of steel in Kg
D = Diameter of steel bars in millimeters (mm)
L= Length of steel bars in meter (m)

2. Derivation Of Formula

We know that,

Volume= Cross-sectional area x Length 
Weight = Volume × Unit weight

Mathematically,

W = A x L x ρ

A = Area = πD²/4
π (pi) = 3.14
D = Diameter of steel bar
L = Length of steel bar

ρ (Rho) = Density of steel bar = 7850 kg/m³

Therefore,

W = 3.14 x D²/4 x L x 7850 kg
Where D and L are in m

We generally express diameter in millimeter (mm) and length in meter (m) unit. So to make the formula more handy let’s take diameter as D mm.

D mm = D/1000 m

Putting D mm value in the expansion of W,

W = 3.141 x (D/1000)²/4 x L x 7850 kg

Or, W = D²L/162 kg

D in mm & L in m.

Hope you got it. 

3. Example: How to calculate weight of steel bar dia 10 mm ?

how to calculate weight of steel bar dia 10mm Let suppose, you want to calculate the weight of 10mm or #3 steel bar weight:
According to quick formula:

W= (#) 2 / 24

W= (3) 2 / 24

W= 9 / 24

W= 0.375 lbs.

W= 0.375 / 2.24

W= 0.167 Kg / ft.

4. Example: How to calculate weight of steel bar dia 8mm ?

 

Let suppose, you want to calculate the weight of 8mm or #2 steel bar weight:
According to another formula:

W = D²L/162 kg

W = (8)² x 1 / 162 kg

W = 64 x 1 / 162 kg

W = 64 / 162 kg

W = 0.395 Kg / Mtr.

W = 0.10 Kg / ft.

I hope, you got the idea of how to calculate unit weight of steel bar dia 8mm.

5. Standard Unit Weight Weight Of Steel Rod

Some standard unit weight weight of steel rod are as follows:

Steel Bar Dia (mm) Unit Weight (Kg / m)
08 0.395
10 0.567
12 0.888
16 1.578
20 2.466
25 3.853

6. Conclusion

 If you are going to be able to figure out the density and the hardness factor, then you will be able to understand how to calculate the weight of a particular bar. In order to measure the density of the steel, you will have to use a scale to get the correct measurements. You would have to weigh each end of the bar and then use these values as you compare them with the next number you will receive when you are comparing them with the total. You would be able to figure out how much the bar weighs easily enough when you learn how to calculate the weight of a particular piece of steel.