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These rebar standards are unfortunately based on legacy units. The bar number is the number of eighths-of-an-inch in diameter of the bar until we reach bar size #9. For example - a #4 bar is 4/8inch or 1/2 Inch in diameter.
Units below are in metric with the legacy units in brackets. metric [legacy].
| Bar Size Designation |
Nominal Area cm2 [inch2] |
Nominal Weight kg/m [lb/ft] |
Nominal Diameter cm [inch] |
|---|---|---|---|
| #3 | 0.71 [0.11] | .52 [ 0.376] | 0.95 [0.375] |
| #4 (most common) | 1.29 [0.20] | 0.994 [0.668] | 1.27 [0.500] |
| #5 | 2.00 [0.31] | 1.55 [1.043] | 1.59 [0.625] |
| #6 | 2.84 [0.44] | 2.24 [1.502] | 1.91 [0.75] |
| #7 | 3.87 [0.6] | 3.041 [2.044] | 2.22 [0.875] |
| #8 | 5.10 [0.79] | 3.97 [2.67] | 2.54 [1] |
| #9 | 6.45 [1] | 5.06 [3.4] | 2.87 [1.128] |
| #10 | 8.19 [1.27] | 6.40 [4.303] | 3.23 [1.27] |
| #11 | 10.06 [1.56] | 7.90 [5.313] | 3.58 [1.41] |
| #14 | 14.52 [2.25] | 11.4 [7.65] | 4.30 [1.693] |
| #18 | 25.81 [4] | 20.2 [13.6] | 5.73 [2.257] |
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