We knew that the D²/162.2 formula to calculate the weight of the rounded bar in Kg/m.  But What about the weight of a steel plate or irregular shape?

Basically, any unit weight calculation falls under this broad formula

Unit weight = Volume X Density

Unit Weight of Steel Bars

From the above formula,  Unit weight of steel bar = Volume of steel bar X Density of steel bar

We know Area of Ciricle = πr²  (where R=D/2) = πD²/4

Therefore the unit weight of steel per meter = Area of steel X Density of steel X Bar Length

= π(D²/4) x 7850 Kg/m³ x 1m
= 3.14 D² /4 X 7850 X 1
= (6162.25 D²) / (1000²) (since diameter is in mm converting to m -> 1 m = 1000 mm)
= D² / 162.2

Therefore Unit weight of steel bar per metre formula is D² / 162.2

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Example Calculation of Steel Bar

What is the weight of 5m length & 16mm Dia bar?

Unit weight of steel bar = D² / 162.2 X Lenght of the bar = (16²)/ 162.2 X 5 m = 7.89 Kg

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How to calculate flat steel bars weight?

Using the above Broad Formula,

Unit Weight of plate = Area x Density of Steel x Thickness

Example

What is the weight of plate having measurement 5m x 2m and thickness 12mm?

Weight of plate = (5 x 2) x 7850 x 0.012 = 942 Kg

Steel Bar – Unit Weight Chart

Here we listed the steel bar weight chart which often used in the reinforcement.

We hope that now you understand the steel bar & steel plate weight calculation. Make use of the calculator.