Rebar area is a standard value and it shall be according to the design code requirements. Since the supplier could change the reinforcement properties as he wishes, there are limiting values for it.
According to the British Standards, the following rebar area table can be used. It indicates the bar diameter, area of rebar, rebar area based on the number of bars, etc.
The same rebar detailing will be used as per the European standards.
British / European Rebar Chart
The above table shows the weight of the rebar per meter length.
In addition, the rebar area can be obtained from the following table depending on the spacing of the bars.
The above table will be very useful when we do the designs. When we know the reinforcement bar area from the design, we can select the bar diameter and the spacing of the reinforcements.
You may refer to the article Rebar – Guide for Design and Construction for further information on reinforcements.
Different countries adopt different bar notations.
US Bar Size Chart with Rebar Area
The following bar sizes and reinforcement bar area is used.
| Imperial bar size | Metric bar size (soft) | Linear Mass Density | Nominal diameter | Nominal area | |||
| lb⁄ft | kg⁄m | (in) | (mm) | (in²) | (mm²) | ||
| #2 | No.6 | 0.167 | 0.249 | 0.250 = 2⁄8 = 1⁄4 | 6.35 | 0.05 | 32 |
| #3 | No.10 | 0.376 | 0.560 | 0.375 = 3⁄8 | 9.53 | 0.11 | 71 |
| #4 | No.13 | 0.668 | 0.994 | 0.500 = 4⁄8 = 1⁄2 | 12.7 | 0.20 | 129 |
| #5 | No.16 | 1.043 | 1.552 | 0.625 = 5⁄8 | 15.9 | 0.31 | 200 |
| #6 | No.19 | 1.502 | 2.235 | 0.750 = 6⁄8 = 3⁄4 | 19.1 | 0.44 | 284 |
| #7 | No.22 | 2.044 | 3.042 | 0.875 = 7⁄8 | 22.2 | 0.60 | 387 |
| #8 | No.25 | 2.670 | 3.973 | 1.000 = 8⁄8 | 25.4 | 0.79 | 510 |
| #9 | No.29 | 3.400 | 5.060 | 1.128 ≈ 9⁄8 | 28.7 | 1.00 | 645 |
| #10 | No.32 | 4.303 | 6.404 | 1.270 ≈ 10⁄8 | 32.3 | 1.27 | 819 |
| #11 | No.36 | 5.313 | 7.907 | 1.410 ≈ 11⁄8 | 35.8 | 1.56 | 1,006 |
| #14 | No.43 | 7.650 | 11.384 | 1.693 ≈ 14⁄8 | 43.0 | 2.25 | 1,452 |
| #18 | No.57 | 13.60 | 20.239 | 2.257 ≈ 18⁄8 | 57.3 | 4.00 | 2,581 |
There is a different bare notation for the Canadian standards.
Canadian Bar Chart
The following table indicates the Canadian bar sizes and rebar area.
| Metric bar size linear linear | Linear Mass Density (kg/m) | Nominal diameter (mm) | Cross-sectional Area (mm²) |
| 10M | 0.785 | 11.3 | 100 |
| 15M | 1.570 | 16.0 | 200 |
| 20M | 2.355 | 19.5 | 300 |
| 25M | 3.925 | 25.2 | 500 |
| 30M | 5.495 | 29.9 | 700 |
| 35M | 7.850 | 35.7 | 1000 |
| 45M | 11.775 | 43.7 | 1500 |
| 55M | 19.625 | 56.4 | 2500 |