How to Calculate the Weight of Steel Bars

[Capacitor 40]

Weight of steel bars= Cross sectional area of steel bar x Length of steel bar x Density of steel bar.

That means,

W = A x L x ρ

Where,
A = Area = πD²/4 
π (pi) = 3.14
D = Diameter of steel bar in millimeter
L = Length of steel bar in meter
ρ (Rho) = Density of steel bar = 7850 kg/m³

Therefore,

W = 3.14 x D²/4  x L x 7850

But there are two conflicting unit in the formula. Those are millimeter for D and m for ρ (Rho).

We have to convert either D or ρ to same unit.

Let’s convert D from millimeter to meter.

1 millimeter = 1/1000 meter

Lets implement this to the formula,

W= 3.14 x D²/(4x1000x1000) x L x 7850

= D²L/162

Using this formula we can calculate the weight of steel bars.

Example
How to calculate the weight of 100 meter long 16mm ø bar?

In this example,

D= 16mm
L = 100 m

So,

W = D²L/162

= 16² x 100/162

= 158 kg (approx)

 

Note: W = D²L/162 IS ONLY FOR ROUND BAR…