### Why do we need to know the unit weight of steel bars round shape

We need to know the unit weight of steel bars for estimate the steel bars actually get the length of those bars.

But steel bar suppliers measure the steel bars as weight. So we have to order them in weight for purchasing. The weight of steel bars can be expressed in kilogram or ton. [ 1 ton = 1000 kg]

### How to Calculate The Weight of Steel Bars

Using a formula for Calculating the weight of Steel Bars.

The formula converts the length of steel bars to weight. We can also use the formula to know the unit weight of steel bars of different sizes.

The Formula is,

**D²L/162**
Where,

**D**= Diameter of steel bar in Millimeter

**L**= Length of steel bars in Meter

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

Calculating Weight of Steel Bars Per Meter

Keep in mind that the unit of D (diameter of the bar) should be in millimeter and L (Length of the bar) should be in meter in this formula.

Let’s see example.

**Example :-**

How to calculate the weight of 100 meters long 16mmÃ¸ bar?

In this example,

D= 16 millimeter

L = 100 meter

So,

**W = D²L/162**

= 16² x 100/162

= 158 kilogram

**If we wish in ton**

=158/1000

**= 0.158 ton**

Let’s see.

**W = D²L/162**

Unit weight of,

• 10mmÃ¸ bar = 10² x 1/162 = 0.617 kg/m

• 12mmÃ¸ bar = 12² x 1/162 = 0.888 kg/m

• 16mmÃ¸ bar = 16² x 1/162 = 1.580 kg/m

• 20mmÃ¸ bar = 20² x 1/162 = 2.469 kg/m

• 25mmÃ¸ bar = 25² x 1/162 = 3.858 kg/m

to calculate other shape of steel bars see this calculators

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