Round bar weight calculator and weight chart per metre.
Round bar weight (kg/m) = D² × 0.006165 for mild steel, with D in mm. A 25 mm MS round bar weighs 3.85 kg/m, and a 6 m length weighs 23.1 kg. For SS 304 use D² × 0.006228; for SS 316 use D² × 0.006267.
Theoretical weight from nominal size and density. Actual weight varies within mill tolerances.
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Round bar weight chart (kg per metre)
Theoretical weight: MS 7.85, SS 304 7.93, SS 316 7.98, aluminium 2.70 and brass 8.50 g/cm³. Multiply kg/m by the required length in metres and number of bars.
| Diameter | MS kg/m | MS 6 m length, kg | SS 304 kg/m | SS 316 kg/m | Aluminium kg/m | Brass kg/m |
|---|---|---|---|---|---|---|
| 6 mm | 0.222 | 1.33 | 0.224 | 0.226 | 0.076 | 0.240 |
| 8 mm | 0.395 | 2.37 | 0.399 | 0.401 | 0.136 | 0.427 |
| 10 mm | 0.617 | 3.70 | 0.623 | 0.627 | 0.212 | 0.668 |
| 12 mm | 0.888 | 5.33 | 0.897 | 0.903 | 0.305 | 0.961 |
| 14 mm | 1.208 | 7.25 | 1.221 | 1.228 | 0.416 | 1.308 |
| 16 mm | 1.578 | 9.47 | 1.594 | 1.604 | 0.543 | 1.709 |
| 18 mm | 1.998 | 11.99 | 2.018 | 2.031 | 0.687 | 2.163 |
| 20 mm | 2.466 | 14.80 | 2.491 | 2.507 | 0.848 | 2.670 |
| 22 mm | 2.984 | 17.90 | 3.014 | 3.033 | 1.026 | 3.231 |
| 25 mm | 3.853 | 23.12 | 3.893 | 3.917 | 1.325 | 4.172 |
| 28 mm | 4.834 | 29.00 | 4.883 | 4.914 | 1.663 | 5.234 |
| 30 mm | 5.549 | 33.29 | 5.605 | 5.641 | 1.909 | 6.008 |
| 32 mm | 6.313 | 37.88 | 6.378 | 6.418 | 2.171 | 6.836 |
| 35 mm | 7.553 | 45.32 | 7.630 | 7.678 | 2.598 | 8.178 |
| 36 mm | 7.990 | 47.94 | 8.072 | 8.123 | 2.748 | 8.652 |
| 38 mm | 8.903 | 53.42 | 8.994 | 9.050 | 3.062 | 9.640 |
| 40 mm | 9.865 | 59.19 | 9.965 | 10.028 | 3.393 | 10.681 |
| 45 mm | 12.485 | 74.91 | 12.612 | 12.692 | 4.294 | 13.519 |
| 50 mm | 15.413 | 92.48 | 15.571 | 15.669 | 5.301 | 16.690 |
| 55 mm | 18.650 | 111.90 | 18.840 | 18.959 | 6.415 | 20.195 |
| 60 mm | 22.195 | 133.17 | 22.422 | 22.563 | 7.634 | 24.033 |
| 65 mm | 26.049 | 156.29 | 26.314 | 26.480 | 8.959 | 28.206 |
| 70 mm | 30.210 | 181.26 | 30.518 | 30.711 | 10.391 | 32.712 |
| 75 mm | 34.680 | 208.08 | 35.034 | 35.255 | 11.928 | 37.552 |
| 80 mm | 39.458 | 236.75 | 39.861 | 40.112 | 13.572 | 42.726 |
| 90 mm | 49.940 | 299.64 | 50.448 | 50.767 | 17.177 | 54.075 |
| 100 mm | 61.654 | 369.92 | 62.282 | 62.675 | 21.206 | 66.759 |
| 110 mm | 74.601 | 447.61 | 75.361 | 75.836 | 25.659 | 80.778 |
| 120 mm | 88.781 | 532.69 | 89.686 | 90.252 | 30.536 | 96.133 |
| 125 mm | 96.334 | 578.00 | 97.316 | 97.929 | 33.134 | 104.311 |
| 130 mm | 104.195 | 625.17 | 105.257 | 105.920 | 35.838 | 112.822 |
| 140 mm | 120.841 | 725.05 | 122.073 | 122.843 | 41.563 | 130.847 |
| 150 mm | 138.721 | 832.33 | 140.135 | 141.018 | 47.713 | 150.207 |
| 160 mm | 157.834 | 947.00 | 159.442 | 160.447 | 54.287 | 170.903 |
| 180 mm | 199.758 | 1,198.55 | 201.794 | 203.066 | 68.707 | 216.299 |
| 200 mm | 246.615 | 1,479.69 | 249.128 | 250.699 | 84.823 | 267.035 |
| 220 mm | 298.404 | 1,790.43 | 301.445 | 303.346 | 102.636 | 323.113 |
| 250 mm | 385.336 | 2,312.02 | 389.263 | 391.717 | 132.536 | 417.243 |
| 300 mm | 554.884 | 3,329.30 | 560.539 | 564.073 | 190.852 | 600.830 |
Buying black or bright stainless rods
Send diameter, tolerance, length, black or bright condition, quantity and delivery PIN code with your enquiry for SS 304 rods and round bars or SS 316 rods and round bars. Nominal calculated mass does not confirm stock or the final invoiced weight. Indicative rates: SS round bar price per kg.
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 MS round bar weight in kg? (formula)
Weight per metre (kg) = π/4 × D² × density / 1000. For mild steel this is D² × 0.006165, often written D²/162. For SS 304 it is D² × 0.006228.
What is the weight of a 25 mm round bar?
About 3.85 kg/m in mild steel, 3.89 kg/m in SS 304 and 3.92 kg/m in SS 316. At 6 m, the stainless bars are about 23.36 kg and 23.50 kg respectively. These are theoretical weights from nominal diameter.
How do I calculate SS 304 black rod weight?
Use the solid round-bar formula with the actual diameter and length: kg/m = π/4 × diameter² in mm × 7.93 / 1000. A 20 mm SS 304 rod is about 2.49 kg/m or 14.95 kg for 6 m. Black or bright condition does not change the nominal alloy density; actual diameter, tolerance and surface condition affect delivered weight.
How much does a 6 m MS round bar weigh?
Multiply the kg/m by 6. A 20 mm MS bar weighs 2.47 kg/m, so 6 m weighs 14.8 kg.
What are SS round bar standard sizes?
Bright (cold drawn, ground or peeled) SS 304 and SS 316 bars are commonly stocked from 3 mm to about 100 mm diameter, in 1 mm steps to around 50 mm and then in 5 mm steps. Black (hot rolled) and peeled bars run from about 16 mm to 300 mm and larger forged bars beyond that. Usual lengths are 3 m to 6 m, or random lengths.
Is calculated weight the same as actual weight?
No. It is theoretical weight from nominal size. Bright and black bars vary within mill tolerances.