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Flat bar weight calculations

 

 

Density of steel

 

 

The acknowledged density of mild steel is 7.85 g/cm3 (0.284 lbs/in3). Depending 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).

 

 

How to calculate the weight

 

 

The weight of flat bar is easily calculated. Simply multiply the appropriate alloy density by the length, width, and thickness of the required part (see worked examples below).

 

 

Metric
density (g/cm³)
x
T
x
W
x
L / 1000
 

weight
Example:
7.85 g/cm³
x
50 mm
x
42 mm
x
1 m / 1000
=
16.485 kg

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

 

Metric

The following charts are samples of some of the common thicknesses and sizes that are available. Please contact us for details of our full product range and current stock availability.

 

 

Size (T x W)
Weight
mm
kg/m
3 x 20
0.471
3 x 50
1.178
3 x 100
2.355
3 x 200
4.710
3 x 300
7.065
5 x 20
0.785
5 x 50
1.963
5 x 100
3.925
5 x 200
7.850
5 x 300
11.775
6 x 20
0.942
6 x 50
2.355
6 x 100
4.710
6 x 200
9.420
6 x 300
14.130
8 x 20
1.256
8 x 50
3.140
8 x 100
6.280
8 x 200
12.560
8 x 300
18.840
10 x 20
1.570

Size (T x W)
Weight
mm
kg/m
10 x 50
3.925
10 x 100
7.850
10 x 200
15.700
10 x 300
23.550
12 x 20
1.884
12 x 50
4.710
12 x 100
9.420
12 x 200
18.840
12 x 300
28.260
16 x 20
2.512
16 x 50
6.280
16 x 100
12.560
16 x 200
25.120
16 x 300
37.680
20 x 50
7.850
20 x 100
15.700
20 x 200
31.400
20 x 300
47.100
25 x 50
9.813
25 x 100
19.625
25 x 200
39.250

Size (T x W)
Weight
mm
kg/m
25 x 300
58.875
30 x 50
11.775
30 x 100
23.550
30 x 200
47.100
30 x 300
70.650
35 x 50
13.738
35 x 100
27.475
35 x 200
54.950
35 x 300
82.425
40 x 50
15.700
40 x 100
31.400
40 x 200
62.800
40 x 300
94.200
42 x 50
16.485
42 x 100
32.970
42 x 200
65.940
42 x 300
98.910
45 x 50
17.663
45 x 100
35.325
45 x 200
70.650
45 x 300
105.975

Size (T x W)
Weight
mm
kg/m
50 x 100
39.250
50 x 200
78.500
50 x 300
117.750
55 x 100
43.175
55 x 200
86.350
55 x 300
129.525
60 x 100
47.100
60 x 200
94.200
60 x 300
141.300
65 x 100
51.025
65 x 200
102.050
65 x 300
153.075
70 x 100
54.950
70 x 200
109.900
70 x 300
164.850
75 x 100
58.875
75 x 200
117.750
75 x 300
176.625
80 x 100
62.800
80 x 200
125.600
80 x 300
188.400

Density based on 7.85 g/cm3

 

How to calculate the weight

The weight of flat bar is easily calculated. Simply multiply the appropriate alloy density by the length, width, and thickness of the required part (see worked examples below).

 

Imperial
density (lbs/in³)
x
T
x
W
x
L / 1000
 

weight
Example:
0.284 lbs/in³
x
2 in
x
12 in
x
1 m / 1000
=
1.704 lbs

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

 

Imperial

 

Size (T x W)
Weight
in
lbs/ft
1/8 x 3/4
0.320
1/8 x 2
0.852
1/8 x 4
1.704
1/8 x 8
3.408
1/8 x 12
5.112
3/16 3/4
0.479
3/16 x 2
1.278
3/16 x 4
2.556
3/16 x 8
5.112
3/16 x 12
7.668
1/4 x 3/4
0.639
1/4 x 2
1.704
1/4 x 4
3.408
1/4 x 8
6.816
1/4 x 12
10.224
5/16 x 3/4
0.799
5/16 x 2
2.130
5/16 x 4
4.260
5/16 x 8
8.520
5/16 x 12
12.780
3/8 x 3/4
0.959

Size (T x W)
Weight
in
lbs/ft
3/8 x 2
2.556
3/8 x 4
5.112
3/8 x 8
10.224
3/8 x 12
15.336
1/2 x 3/4
1.278
1/2 x 2
3.408
1/2 x 4
6.816
1/2 x 8
13.632
1/2 x 12
20.448
5/8 x 3/4
1.598
5/8 x 2
4.260
5/8 x 4
8.520
5/8 x 8
17.040
5/8 x 12
25.560
3/4 x 2
5.112
3/4 x 4
10.224
3/4 x 8
20.448
3/4 x 12
30.672
1 x 2
6.816
1 x 4
13.632
1 x 8
27.264

Size (T x W)
Weight
in
lbs/ft
1 x 12
40.896
1 1/4 x 2
8.520
1 1/4 x 4
17.040
1 1/4 x 8
34.080
1 1/4 x 12
51.120
1 3/8 x 2
9.372
1 3/8 x 4
18.744
1 3/8 x 8
37.488
1 3/8 x 12
56.232
1 1/2 x 2
10.224
1 1/2 x 4
20.448
1 1/2 x 8
40.896
1 1/2 x 12
61.344
1 5/8 x 2
11.076
1 5/8 x 4
22.152
1 5/8 x 8
44.304
1 5/8 x 12
66.456
1 3/4 x 2
11.928
1 3/4 x 4
23.856
1 3/4 x 8
47.712
1 3/4 x 12
71.568

Size (T x W)
Weight
in
lbs/ft
2 x 4
27.264
2 x 8
54.528
2 x 12
81.792
2 1/8 x 4
28.968
2 1/8 x 8
57.936
2 1/8 x 12
86.904
2 3/8 x 4
32.376
2 3/8 x 8
64.752
2 3/8 x 12
97.128
2 1/2 x 4
34.080
2 1/2 x 8
68.160
2 1/2 x 12
102.240
2 3/4 x 4
37.488
2 3/4 x 8
74.976
2 3/4 x 12
112.464
3 x 4
40.896
3 x 8
81.792
3 x 12
122.688
3 1/4 x 4
44.304
3 1/4 x 8
88.608
3 1/4 x 12
132.912

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