Square bar weight calculator and weight chart per metre.
Square bar weight (kg/m) = A² × 0.00785 for mild steel, where A is the side in mm. A 12 mm MS square bar weighs 1.13 kg/m (0.344 kg per foot), so a 20 ft bar weighs 6.89 kg. A 25 mm bar weighs 4.91 kg/m and a 6 m length 29.4 kg. Use A² × 0.00793 for SS 304 and A² × 0.0027 for aluminium.
Theoretical weight from nominal size and density. Actual weight varies within mill tolerances.
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Square bar weight: quick answers
- 8 mm square bar weight: 0.502 kg/m, 0.153 kg per foot, 3.06 kg per 20 ft bar (MS).
- 10 mm square bar weight: 0.785 kg/m, 0.239 kg per foot, 4.79 kg per 20 ft bar (MS).
- 12 mm square bar weight: 1.130 kg/m, 0.345 kg per foot, 6.89 kg per 20 ft bar (MS).
- 16 mm square bar weight: 2.010 kg/m, 0.613 kg per foot, 12.25 kg per 20 ft bar (MS).
- 20 mm square bar weight: 3.140 kg/m, 0.957 kg per foot, 19.14 kg per 20 ft bar (MS).
- 25 mm square bar weight: 4.906 kg/m, 1.495 kg per foot, 29.91 kg per 20 ft bar (MS).
Square bar weight chart (kg per metre, per foot and per bar)
Theoretical weight with sharp corners: MS 7.85, SS 304 7.93 and aluminium 2.70 g/cm³. A 20 ft bar is 6.096 m. Hot-rolled bars with rounded corners weigh slightly less.
| Size | MS kg/m | MS kg/ft | MS 20 ft bar, kg | MS 6 m length, kg | SS 304 kg/m | Aluminium kg/m |
|---|---|---|---|---|---|---|
| 6 × 6 mm | 0.283 | 0.086 | 1.72 | 1.70 | 0.285 | 0.097 |
| 8 × 8 mm | 0.502 | 0.153 | 3.06 | 3.01 | 0.508 | 0.173 |
| 10 × 10 mm | 0.785 | 0.239 | 4.79 | 4.71 | 0.793 | 0.270 |
| 12 × 12 mm | 1.130 | 0.345 | 6.89 | 6.78 | 1.142 | 0.389 |
| 14 × 14 mm | 1.539 | 0.469 | 9.38 | 9.23 | 1.554 | 0.529 |
| 16 × 16 mm | 2.010 | 0.613 | 12.25 | 12.06 | 2.030 | 0.691 |
| 18 × 18 mm | 2.543 | 0.775 | 15.50 | 15.26 | 2.569 | 0.875 |
| 20 × 20 mm | 3.140 | 0.957 | 19.14 | 18.84 | 3.172 | 1.080 |
| 22 × 22 mm | 3.799 | 1.158 | 23.16 | 22.80 | 3.838 | 1.307 |
| 25 × 25 mm | 4.906 | 1.495 | 29.91 | 29.44 | 4.956 | 1.688 |
| 28 × 28 mm | 6.154 | 1.876 | 37.52 | 36.93 | 6.217 | 2.117 |
| 30 × 30 mm | 7.065 | 2.153 | 43.07 | 42.39 | 7.137 | 2.430 |
| 32 × 32 mm | 8.038 | 2.450 | 49.00 | 48.23 | 8.120 | 2.765 |
| 36 × 36 mm | 10.174 | 3.101 | 62.02 | 61.04 | 10.277 | 3.499 |
| 40 × 40 mm | 12.560 | 3.828 | 76.57 | 75.36 | 12.688 | 4.320 |
| 45 × 45 mm | 15.896 | 4.845 | 96.90 | 95.38 | 16.058 | 5.468 |
| 50 × 50 mm | 19.625 | 5.982 | 119.63 | 117.75 | 19.825 | 6.750 |
| 56 × 56 mm | 24.618 | 7.503 | 150.07 | 147.71 | 24.868 | 8.467 |
| 60 × 60 mm | 28.260 | 8.614 | 172.27 | 169.56 | 28.548 | 9.720 |
| 63 × 63 mm | 31.157 | 9.497 | 189.93 | 186.94 | 31.474 | 10.716 |
| 65 × 65 mm | 33.166 | 10.109 | 202.18 | 199.00 | 33.504 | 11.408 |
| 70 × 70 mm | 38.465 | 11.724 | 234.48 | 230.79 | 38.857 | 13.230 |
| 75 × 75 mm | 44.156 | 13.459 | 269.18 | 264.94 | 44.606 | 15.188 |
| 80 × 80 mm | 50.240 | 15.313 | 306.26 | 301.44 | 50.752 | 17.280 |
| 90 × 90 mm | 63.585 | 19.381 | 387.61 | 381.51 | 64.233 | 21.870 |
| 100 × 100 mm | 78.500 | 23.927 | 478.54 | 471.00 | 79.300 | 27.000 |
| 110 × 110 mm | 94.985 | 28.951 | 579.03 | 569.91 | 95.953 | 32.670 |
| 120 × 120 mm | 113.040 | 34.455 | 689.09 | 678.24 | 114.192 | 38.880 |
| 125 × 125 mm | 122.656 | 37.386 | 747.71 | 735.94 | 123.906 | 42.188 |
| 130 × 130 mm | 132.665 | 40.436 | 808.73 | 795.99 | 134.017 | 45.630 |
| 140 × 140 mm | 153.860 | 46.897 | 937.93 | 923.16 | 155.428 | 52.920 |
| 150 × 150 mm | 176.625 | 53.835 | 1,076.71 | 1,059.75 | 178.425 | 60.750 |
| 160 × 160 mm | 200.960 | 61.253 | 1,225.05 | 1,205.76 | 203.008 | 69.120 |
| 180 × 180 mm | 254.340 | 77.523 | 1,550.46 | 1,526.04 | 256.932 | 87.480 |
| 200 × 200 mm | 314.000 | 95.707 | 1,914.14 | 1,884.00 | 317.200 | 108.000 |
Reference basis: Compiled by Steel Impex India. Check each table’s source, product form and delivery condition before use. Sources, calculation methods and corrections.
Frequently asked questions
How do you calculate square bar weight? (formula)
Weight per metre (kg) = side (mm) × side (mm) × density / 1000. For mild steel this is A² × 0.00785.
What is the weight of a 12 mm square bar?
1.130 kg per metre, 0.344 kg per foot and 6.89 kg for a 20 ft (6.1 m) bar in mild steel. In SS 304 it is 1.142 kg/m.
What is the weight of a 10 mm square bar per foot?
0.239 kg per foot (0.785 kg/m) in mild steel, or 4.79 kg for a 20 ft bar.
What is the weight of a 20 mm square bar?
3.14 kg per metre, 0.957 kg per foot and 19.1 kg for a 20 ft bar in mild steel.
What is the weight of a 50 mm MS square bar?
19.63 kg per metre, or 117.8 kg for a 6 m length.
What is the weight of a 40 mm SS 304 square bar?
12.69 kg per metre at 7.93 g/cm³.
Why does my square bar weigh slightly less than the chart?
Hot-rolled square bars have rounded corners, so they weigh a little less than the sharp-cornered theoretical value.
Is a 25 mm square bar the same weight as a 25 mm round bar?
No. A solid square has area side²; a round has area π × diameter²/4. At the same nominal size, length and density, the square bar is about 27.3% heavier.