Steel bar

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