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 = πr

^{2 }(where R=D/2) = πD^{2}/4

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

= π(D^{2}/4) x 7850 Kg/m^{3} x 1m

= 3.14 D^{2} /4 X 7850 X 1

= (6162.25 D^{2}) / (1000^{2}) (since diameter is in mm converting to m -> 1 m = 1000 mm)

= D^{2} / 162.2

Therefore **Unit weight of steel bar per metre formula is D ^{2} / 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 = D

^{2}/ 162.2 X Lenght of the bar = (16^{2})/ 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.

Dia of Bar |
Weight in Kg/m |

8 | 0.394 |

10 | 0.616 |

12 | 0.887 |

16 | 1.578 |

20 | 2.466 |

25 | 3.853 |

32 | 6.313 |

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