**Table of Contents**show

## What is rebar?

Rebar is the common name of ribbed steel bar, including hot-rolled ribbed steel bar and cold-rolled ribbed steel bar.

The grade of rebar is composed of HRB and the minimum yield point of rebar, which is divided into three grades: HRB335, HRB400 and HRB500.

For seismic reinforcement grade, “E” is added after ordinary reinforcement, such as HRB400E.

Since the billet density (7.85g/cm³) used for reinforcement rolling is the same, the theoretical weight of rebars of the same specification is the same regardless of whether the rolling method and grade are the same.

You can use both of our rebar weight calculator or the chart below to get the weight of rebar steel.

## Rebar Weight Calculator

## Rebar Weight Chart (Unit: kg/m)

Item | Model | Unit | Weight |
---|---|---|---|

Rebar | Φ6 | kg/m | 0.222 |

Rebar | Φ8 | kg/m | 0.395 |

Rebar | Φ10 | kg/m | 0.6169 |

Rebar | Φ12 | kg/m | 0.888 |

Rebar | Φ14 | kg/m | 1.21 |

Rebar | Φ16 | kg/m | 1.58 |

Rebar | Φ18 | kg/m | 2 |

Rebar | Φ20 | kg/m | 2.47 |

Rebar | Φ22 | kg/m | 2.98 |

Rebar | Φ25 | kg/m | 3.85 |

Rebar | Φ28 | kg/m | 4.83 |

Rebar | Φ32 | kg/m | 6.31 |

Rebar | Φ36 | kg/m | 7.99 |

Rebar | Φ40 | kg/m | 9.87 |

Rebar | Φ50 | kg/m | 15.42 |

MS HR round wire rod | Φ5.5 | kg/m | 0.187 |

MS HR round wire rod | Φ6.0 | kg/m | 0.222 |

MS HR round wire rod | Φ6.5 | kg/m | 0.26 |

MS HR round wire rod | Φ7.0 | kg/m | 0.3019 |

MS HR round wire rod | Φ7.5 | kg/m | 0.3469 |

Steel Strand for Prestressed Concrete（1×2） | 10 | kg/km | 310 |

Steel Strand for Prestressed Concrete（1×2） | 12 | kg/km | 447 |

Steel Strand for Prestressed Concrete（1×3） | 10.8 | kg/km | 465 |

Steel Strand for Prestressed Concrete（1×3） | 12.9 | kg/km | 671 |

Steel Strand for Prestressed Concrete（1×7）Standard | 9.5 | kg/km | 432 |

Steel Strand for Prestressed Concrete（1×7）Standard | 11.1 | kg/km | 580 |

Steel Strand for Prestressed Concrete（1×7）Standard | 12.7 | kg/km | 774 |

Steel Strand for Prestressed Concrete（1×7）Standard | 15.2 | kg/km | 1101 |

Steel Strand for Prestressed Concrete（1×7）Drawing Type | 12.7 | kg/km | 890 |

Steel Strand for Prestressed Concrete（1×7）Drawing Type | 15.2 | kg/km | 1295 |

Indented wire | 5 | kg/km | 0.016 |

**Note:**

(1) Theoretical weight calculation formula of rebar: theoretical weight (kg/m) = 0.00617 × D² (where, D is the section diameter, unit: mm)

(2) The density is calculated as 7.85g/cm³;

(3) The theoretical weight of hot-rolled ribbed bars, cold-rolled ribbed bars, HRB335, HRB400, HRB500 and other deformed bars of different classifications is the same.

(4) The theoretical weight calculated by the formula is different from the actual weight, and the error is generally about 0.2% ~ 0.7%, which can only be used as a reference for estimation.

**Weight of reinforcement with common specifications (weight per meter)**

For example:

- Φ6=0.222Kg
- Φ8=0.395Kg
- Φ10=0.617Kg
- Φ12=0.888Kg
- Φ14=1.21Kg
- Φ16=1.58Kg
- Φ18=2Kg
- Φ20=2.47Kg
- Φ22=3Kg
- Φ25=3.86Kg
- Φ28=4.83Kg
- Φ32=6.31Kg
- Φ36=7.99Kg
- Φ40=9.87Kg

**Classification of rebar**

There are two common classification methods for rebar:

First, it is classified according to the geometric shape. It is classified or classified according to the section shape of the cross rib and the spacing between the ribs.

For example, in the British Standard (BS4449), the rebar is classified into Type I and Type II.

This classification mainly reflects the grip performance of rebar.

Second, according to the performance classification (grade), for example, the rebar is classified into three grades according to the strength grade (yield point/tensile strength) in the current executive standard of our country (GB1499.2-2007) wire rod 1499.1-2008);

In the Japanese Industrial Standard (JISG3112), the rebar is divided into 5 categories according to the comprehensive performance;

British Standard (BS4461) also specifies several grades of rebar performance test.

In addition, rebar can also be classified according to its use, such as ordinary rebar for reinforced concrete, prestressed rebar, heat-treated rebar for concrete, etc.

**Specification of rebar**

The specification of rebar is usually required to be listed in the import and export trade contract.

Generally speaking, the specification of rebar shall include standard grade, nominal diameter of rebar, nominal weight (i.e. mass), specified length and allowable difference of the above indicators.

The nominal diameters recommended in the rebar standard are 6, 8, 10, 12, 16, 20, 25, 32, 40 and 50 mm.

The supplied length of the rebar can be divided into fixed length and multiple length.

The fixed length selection range of rebar exported from China is 6~12, and that of rebar exported from Japan is 3.5~10m;

If there is no requirement specified in the contract for the domestic rebar, its length is usually 9m and 12.

**Application of rebar**

The rebar is widely used in civil engineering construction such as houses, bridges and roads.

From highways, railways, bridges, culverts, tunnels, flood control, dams and other public facilities, to foundations, beams, columns, walls, slabs, and rebar of houses and buildings, they are indispensable structural materials.

Don HartleyIs there an industry engineering standard for rebar?