U.S. Sizes

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
 

 


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.

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
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