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The weight of round bar is easily calculated. Simply multiply the appropriate alloy density by the length and diameter of the required part (see worked example below).

 

Metric
density (g/cm³)
x
x
L
x
π / 4000
 

weight
Example:
7.85 g/cm³
x
20 mm²
x
1 m
x
π / 4000
=
2.47 kg
 

Imperial
density (lbs/in³)
x
x
L
x
π / 4
 

weight
Example:
0.284 lbs/in³
x
2 in²
x
12 in
x
π / 4
=
10.71 lbs

For imperial weight calculations certain measurements (fractions) need to be converted to decimal inches. 

 

For an accurate calculation it is also important to allow for the rolled/drawn tolerances on diameter defined by the manufacturing specification please contact us for details.

 

Density of steel

The acknowledged density of mild steel is 7.85 g/cm3(0.284 lbs/in3). Dependent on the alloy elements added to manufactured specifications this can vary between 7.75 and 8.05 g/cm3 (0.280 and 0.291 lbs/in3).

 

The following chart is a sample of some of the common diameters that are available. Please contact us for details of our full product range and current stock availability.

 

Diameter
Weight
mm
in
kg/m
lbs/ft
6.0
 

0.22
 

 

1/4
 

0.17
 

3/8
 

0.38
10.0
 

0.62
 

12.0
 

0.89
 

 

1/2
 

0.67
 

3/4
 

1.51
20.0
 

2.47
 

 

1
 

2.68
30.0
 

5.55
 

 

1 1/2
 

6.02
40.0
 

9.87
 

50.0
2
15.4 2
10.71
 

2 1/4
 

13.55
60.0
 

22.20
 

 

2 1/2
 

16.73
70.0
2 3/4
30.21
20.24
 

3
 

24.09
80.0
 

39.46
 

90.0
3 1/2
49.95
32.79
100.0
4
61.66
42.83
110.0
 

74.61
 

 

4 1/2
 

54.21
120.0
 

88.79
 

 

5
 

66.92
140.0
5 1/2
120.86
80.98
150.0
6
138.74
96.37
160.0
 

157.85
 

180.0
7
199.78
131.17
190.0
7 1/2
222.57
150.56
200.0
 

246.65
 

250.0
10
385.39
267.70
300.0
 

554.96
 

400.0
 

986.59
 

Density based on 7.85 g/cm3 (0.284 lbs/in3)

 

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