## Reinforcing steel bar sizes

- Written by Andrew Dachnik

U.S. rebar sizes: Imperial rebar designations represent the rebar diameter in fractions of 1/8 inch, such that #8 = 8/8 inch = 1 inch diameter. Area = (rebar size/9) 2 such that area of #8 = (rebar 8/9)2 = 0.79 inch. This applies to #8 rebars and smaller. Larger rebars have a slightly larger diameter than the one computed using the 1/8 inch convention.

Imperial
Bar Size | "Soft"
Metric Size | Weight
(lb/ft) | Weight
(kg/m) | Nominal Diameter
(in) | Nominal Diameter
(mm) | Nominal Area
(in²) | Nominal Area
(mm²) |
---|---|---|---|---|---|---|---|

#3 |
#10 | 0.376 | 0.561 | 0.375 = 3/8 | 9.525 | 0.11 | 71 |

#4 |
#13 | 0.668 | 0.996 | 0.500 = 1/2 | 12.7 | 0.20 | 129 |

#5 |
#16 | 1.043 | 1.556 | 0.625 = 5/8 | 15.875 | 0.31 | 200 |

#6 |
#19 | 1.502 | 2.24 | 0.750 = 3/4 | 19.05 | 0.44 | 284 |

#7 |
#22 | 2.044 | 3.049 | 0.875 = 7/8 | 22.225 | 0.60 | 387 |

#8 |
#25 | 2.670 | 3.982 | 1.000 = 8/8 | 25.4 | 0.79 | 509 |

#9 |
#29 | 3.400 | 5.071 | 1.128 | 28.65 | 1.00 | 645 |

#10 |
#32 | 4.303 | 6.418 | 1.270 | 32.26 | 1.27 | 819 |

#11 |
#36 | 5.313 | 7.924 | 1.410 | 35.81 | 1.56 | 1006 |

#12 |
#40 | 6.424 | 9.619 | 1.50 | 38.1 | 1.76 | 1140 |

#14 |
#43 | 7.650 | 11.41 | 1.693 | 43 | 2.25 | 1452 |

#18 |
#57 | 13.60 | 20.284 | 2.257 | 57.33 | 4.00 | 2581 |

European rebar sizes: Metric rebar designations represent the nominal rebar diameter in millimetres. Rebars in Europe will be specified to comply with the standard EN 10080.

Unit weights for rebar or reinforcing bar length 11,75 meters. Rebar weight table for reinforcing bars from 5, 5 mm to 32 mm.

rebar size(mm) |
1 meter rebar weights (kg) |
1 rebars weights 11,75 m (kg) |
length for 1 tonn of steel rebars |

5,5 |
0,187 | 2,19 | 5347 |

6,0 |
0,222 | 2,60 | 4504 |

8,0 |
0,395 | 4,64 | 2531` |

10,0 |
0,617 | 7,25 | 1620 |

12,0 |
0,888 | 10,43 | 1126 |

14,0 |
1,210 | 14,21 | 826 |

16,0 |
1,580 | 18,56 | 633 |

18,0 |
2,000 | 23,50 | 500 |

20,0 |
2,470 | 29,00 | 405 |

22,0 |
2,980 | 35,00 | 335 |

25,0 |
3,850 | 45,23 | 260 |

28,0 |
4,830 | 56,75 | 207 |

32,0 |
6,310 | 74,14 | 158 |

** Steel reinforced bar concrete beam formula**

There are four main rules for steel reinforced concrete beams:

1. To count the height of the reinforced concrete beam devide the gap length by 20. For example: the gap is 4 meters. Thу minimum height of the concrete beam should be 4 / 20 = 0,2 meter

2. To count the width of the concrete beam: Multiply the height by 5 and devide by 7. For example: the beam height is 0,2 meter. 0,2 x 5 / 7 = 0,14 m.

3. The beam should be enforsed with at least 4 steel re bars d12-14 in two levels.

4. The concrete should be applied all volume at once without big waiting gaps.

Dicslaimer: all re bar information provided at that page are for private use only and should be verified by the certified engineer in each case of construction.