Aluminum bar

Densities of common alloys

The density of an alloy is determined by its chemical composition – the purer alloys are lighter and those which have a greater content of other elements are heavier. As can be seen from the chart, the density of individual alloys can vary from 2.63 to 2.85 g/cm3 (0.095 to 0.103 lbs/in3) or 7.7 %. Therefore in calculating the weight of a component it is important to use the density of the alloy concerned.

Alloy g/cm3 lbs/in3
2011 2.82 0.102
2014 2.80 0.101
2024 2.77 0.100
2031 2.77 0.100
2124 2.77 0.100
2618 2.77 0.100
5083 2.66 0.096
5086 2.66 0.096
5251 2.69 0.097
6061 2.71 0.098
6082 2.71 0.098
7010 2.82 0.102
7017 2.76 0.100
7019 2.76 0.100
7050 2.82 0.102
7075 2.80 0.101
7175 2.80 0.101

Round bar weight calculations

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.

How to calculate the weight of round bar

The weight of round bar is easily calculated. Simply multiply the appropriate alloy density (see chart above) by the length and diameter squared of the required part (see worked example below and note that we have used the density of alloy 2014 as the basis for our calculations).

Metric density (g/cm³) x D² x L x π / 4000   weight
Example: 2.80 g/cm³ x 20 mm² x 1 m x π / 4000 = 0.880 kg
 
Imperial density (lbs/in³) x D² x L x π / 4   weight
Example: 0.101 lbs/in³ x 0.75 in² x 12 in x π / 4 = 0.536 lbs

 

For imperial weight calculations certain measurements (fractions) need to be converted to decimal inches. Please see the conversion table.

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.

Diameter Weight
mm in kg/m lbs/ft
6.35 1/4 0.089 0.060
10.0   0.220  
12.7 1/2 0.355 0.238
15.0   0.495  
19.1 3/4 0.798 0.536
20.0   0.880  
25.0   1.375  
25.4 1 1.419 0.952
30.0   1.979  
38.1 1 1/2 3.193 2.142
40.0   3.519  
50.0   5.499  
50.8 2 5.676 3.808
60.0   7.918  
63.5 2 1/2 8.869 5.950
70.0   10.78  
76.2 3 12.77 8.568
80.0   14.08  
90.0   17.82  
100.0   21.99  
101.6 4 22.70 15.230
110.0   26.61  
120.0   31.67  
127.0 5 35.47 23.801
130.0   37.17  
150.0   49.49  
152.4 6 51.08 34.273
177.8 7 69.53 46.649
180.0   71.26  
200.0   87.98  
203.2 8 90.81 60.922
210.0   96.99  
220.0   106.5  
228.6 9 114.9 77.114
250.0   137.5  
254.0 10 141.9 95.203
260.0   148.7  
279.4 11 171.7 115.195
304.8 12 204.3 137.092
330.2 13 239.8 160.892
355.6 14 278.1 186.597
400.0   351.9  
406.4 16 363.3 243.719

Density based on 2.80 g/cm³ (0.101 lbs/in³)

Square bar weight calculations

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

How to calculate the weight of square bar

The weight of square bar is easily calculated. Simply multiply the appropriate alloy density (see chart on previous page) by the length and thickness squared of the required part (see worked example below and note that we have used the density of alloy 2014 as the basis for our calculations).

Metric density (g/cm³) x T² x L / 1000   weight
Example: 2.80 g/cm³ x 10 mm² x 1 m / 1000 = 0.280 kg
 
Imperial density (lbs/in³) x T² x L   weight
Example: 0.101 lbs/in³ x 4 in² x 12 in = 19.39 lbs


For imperial weight calculations certain measurements (fractions) need to be converted to decimal inches. Please see the conversion table.

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

Thickness Weight
mm in kg/m lbs/ft
10   0.28  
12.7 1/2 0.45 0.30
15   0.63  
19.05 3/4 1.02 0.68
20   1.12  
25.4 1 1.81 1.21
30   2.52  
38.1 1 1/2 4.06 2.73
40   4.48  
44.4 1 3/4 5.52 3.71
50   7.00  
50.8 2 7.23 4.85
60   10.08  
63.5 2 1/2 11.29 7.57
70   13.72  
76.2 3 16.26 10.91
80   17.92  
90   22.68  
100   28.00  
101.6 4 28.90 19.39
110   33.88  
120   40.32  
127 5 45.16 30.30
150   63.00  
152.4 6 65.03 43.63
160   71.68  
177.8 7 88.51 59.39
180   90.72  
200   112.00  
203.2 8 115.61 77.57

Density based on 2.80 g/cm³ (0.101 lbs/in³)

Flat bar weight calculations

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.

How to calculate the weight of flat bar

The weight of flat bar is easily calculated. Simply multiply the appropriate alloy density (see chart on page 46) by the length, width, and thickness of the required part (see worked example below and note that we have used the density of alloy 2014 as the basis for our calculations).

Metric density (g/cm³) x T x W x L / 1000   weight
Example: 2.80 g/cm³ x 50 mm x 20 mm x 1 m / 1000 = 2.8 kg
 
Imperial density (lbs/in³) x T x W x L   weight
Example: 0.101 lbs/in³ x 0.50 in x 2 in x 12 in = 1.21 lbs

 

For imperial weight calculations certain measurements (fractions) need to be converted to decimal inches. Please see the conversion table.

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

 

Thickness Width Weight
mm mm kg/m
5 20 0.28
5 25 0.35
5 30 0.42
5 40 0.56
5 50 0.7
5 70 1
5 100 1.4
10 15 0.42
10 20 0.56
10 25 0.7
10 30 0.84
10 40 1.1
10 45 1.3
10 50 1.4
10 60 1.7
10 70 2
10 80 2.2
10 90 2.5
10 100 2.8
15 20 0.84
15 25 1.05
15 30 1.26
15 40 1.7
15 45 1.9
15 50 2.1
15 60 2.5
20 25 1.4
20 30 1.68
20 40 2.2
20 45 2.5
20 50 2.8
20 55 3.1
20 60 3.4
20 70 3.9
20 80 4.5
20 90 5
20 100 5.6
25 30 2.1
25 40 2.8
25 45 3.2
25 50 3.5
30 40 3.4
30 45 3.8
30 50 4.2
30 55 4.6
30 60 5
30 70 5.9
30 80 6.7
30 90 7.6
30 100 8.4
35 40 3.9
35 45 4.4
35 50 4.9
40 50 5.6
40 60 6.7
40 70 7.8
40 80 9
40 90 10.1
40 100 11.2
50 60 8.4
50 70 9.8
50 80 11.2
50 90 12.6
50 100 14

Density based on 2.80 g/cm³

Thickness Width Weight
in in lbs/ft
1/4 1 0.30
3/8 5/8 0.28
1/2 1 0.61
1/2 1 1/2 0.91
1/2 1 1/4 0.76
1/2 1 3/4 1.06
1/2 2 1.21
1/2 2 1/2 1.52
1/2 2 1/4 1.36
1/2 2 3/4 1.67
1/2 3 1.82
1/2 3 1/2 2.12
1/2 3/4 0.45
1/2 4 2.42
5/8 1 1/2 1.14
5/8 1 1/4 0.95
5/8 1 3/4 1.33
5/8 2 1.52
5/8 2 1/2 1.89
5/8 2 1/4 1.70
5/8 2 3/4 2.08
5/8 3 2.27
5/8 3 1/2 2.65
5/8 3/4 0.57
5/8 4 3.03
3/4 1 0.91
3/4 1 1/2 1.36
3/4 1 1/4 1.14
3/4 1 3/4 1.59
3/4 2 1.82
3/4 2 1/2 2.27
3/4 2 1/4 2.05
3/4 2 3/4 2.50
3/4 3 2.73
3/4 3 1/2 3.18
3/4 4 3.64
1 1 1/2 1.82
1 1 3/4 2.12
1 2 2.42
1 2 1/2 3.03
1 2 1/4 2.73
1 2 3/4 3.33
1 3 3.64
1 3 1/2 4.24
1 4 4.85
1 1/4 1 3/4 2.65
1 1/4 2 3.03
1 1/4 2 1/2 3.79
1 1/4 2 1/4 3.41
1 1/4 2 3/4 4.17
1 1/4 3 4.55
1 1/4 3 1/2 5.30
1 1/4 4 6.06
1 1/2 1 3/4 3.18
1 1/2 2 3.64
1 1/2 2 1/2 4.55
1 1/2 2 1/4 4.09
1 1/2 2 3/4 5.00
1 1/2 3 5.45
1 1/2 3 1/2 6.36
1 1/2 4 7.27
2 2 1/2 6.06
2 2 1/4 5.45
2 2 3/4 6.67
2 3 7.27
2 3 1/2 8.48
2 4 9.70
2 1/4 2 3/4 7.50
2 1/4 3 1/2 9.54
2 1/2 3 9.09
2 1/2 3 1/2 10.61
2 1/2 4 12.12
3 3 1/2 12.73
3 4 14.54
3 1/2 4 16.97