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. |
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| 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 |
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Canadian Sizes
Metric bar designations represent the nominal bar diameter in millimeters, rounded to the nearest 5 mm. |
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| 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 |
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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). |
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| 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 |
2.467 |
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 |
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Rebar Standards |
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