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Steel Rebar Sizes

U.S. Sizes

Imperial bar designations represent the bar diameter in fractions of ⅛ inch, such that #8 = 8⁄8 inch = 1 inch diameter. Area = (bar size/9)2 such that area of #8 = (8/9)2 = 0.79 in2. This applies to #8 bars and smaller. Larger bars have a slightly larger diameter than the one computed using the ⅛ inch convention.

U.S. SIZES
Imperial Bar Size Soft Metric Size Weight per unit length (lb⁄ft) Mass per unit length (kg/m) Nominal Diameter (in) Nominal Diameter (mm) Nominal Area (in²) Nominal Area (mm²)
#3 #10 0.376 0.561 0.375 = ⅜ 9.525 0.11 71
#4 #13 0.668 0.996 0.500 = ½ 12.7 0.20 129
#5 #16 1.043 1.556 0.625 = ⅝ 15.875 0.31 200
#6 #19 1.502 2.24 0.750 = ¾ 19.05 0.44 284
#7 #22 2.044 3.049 0.875 = ⅞ 22.225 0.60 387
#8 #25 2.670 3.982 1.000 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
#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

Canadian Sizes

Metric bar designations represent the nominal bar diameter in millimeters, rounded to the nearest 5 mm.

Canadian Sizes
Metric Bar Size Mass per unit length (kg/m) Nominal Diameter (in) 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

European Sizes

Metric bar designations represent the nominal bar diameter in millimetres. Bars in Europe will be specified to comply with the standard EN 10080 (awaiting introduction as of early 2007), although various national standards still remain in force (e.g. BS 4449 in the United Kingdom).

European Sizes
Metric Bar Size Mass per unit length (kg/m) Nominal Diameter (in) Cross Sectional Area (mm²)
6,0 0.222 6 28.3
8,0 0.395 8 50.3
10,0 0.617 10 78.5
12,0 0.888 12 113
14,0 1.21 14 154
16,0 1.579 16 201
20,0 #29 20 314
25,0 3.855 25 491
28,0 4.83 28 616
32,0 6.316 32 804
40,0 9.868 40 1257
50,0 15.413 50 1963