Standard ASTM Reinforcing Bar sizes


Rebar standard dimensions by Bar designation

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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