Stainless steel bar weight chart: round, square, hexagon, flat bar and angle (kg/m)
Weight per metre of 304, 303 and 316L stainless round, square, hexagon and flat bar and equal angle, with the formulas and the weight of a 6 m bar.
Updated October 18, 2026
Weight per metre for the stainless steel bars and angles in our range: round bar in 304, 303 and 316L, square bar, hexagon bar, flat bar and equal angle. Use the tables to estimate the weight of a cutting list or check a delivery before you order.
How stainless bar weight is calculated
Stainless steel is slightly denser than carbon steel. The tables use 7.93 kg/dm³ for 304 and 7.98 kg/dm³ for 316L, against 7.85 kg/dm³ for carbon steel, so a stainless bar weighs about 1% more than the same carbon steel bar. 303 weighs practically the same as 304.
- Round bar — d² × 0.006228 = kg/m for 304 (d² × 0.006267 for 316L). A Ø20 bar in 304 weighs 400 × 0.006228 = 2.49 kg/m.
- Square bar — a² × 0.00793 = kg/m. A 20 mm square in 304 weighs 3.17 kg/m.
- Hexagon bar — s² × 0.006867 = kg/m, where s is the size across flats. A 24 mm hexagon in 304 weighs 3.96 kg/m.
- Flat bar — width × thickness × 0.00793 = kg/m. A 50 × 10 flat in 304 weighs 3.97 kg/m.
- Equal angle — t × (2a − t) × 0.00793 = kg/m, a sharp-corner estimate. A 30 × 30 × 3 angle weighs 1.36 kg/m.
Stainless steel round bar weight
| Diameter (mm) | 304 / 303 kg/m | 316L kg/m | 304, 6 m bar (kg) |
|---|---|---|---|
| 3 | 0.056 | 0.056 | 0.336 |
| 4 | 0.100 | 0.100 | 0.598 |
| 5 | 0.156 | 0.157 | 0.934 |
| 6 | 0.224 | 0.226 | 1.35 |
| 7 | 0.305 | 0.307 | 1.83 |
| 8 | 0.399 | 0.401 | 2.39 |
| 10 | 0.623 | 0.627 | 3.74 |
| 12 | 0.897 | 0.903 | 5.38 |
| 14 | 1.22 | 1.23 | 7.32 |
| 15 | 1.40 | 1.41 | 8.41 |
| 16 | 1.59 | 1.60 | 9.57 |
| 18 | 2.02 | 2.03 | 12.11 |
| 20 | 2.49 | 2.51 | 14.95 |
| 22 | 3.01 | 3.03 | 18.09 |
| 25 | 3.89 | 3.92 | 23.36 |
| 28 | 4.88 | – | 29.30 |
| 30 | 5.61 | 5.64 | 33.63 |
| 35 | 7.63 | 7.68 | 45.78 |
| 40 | 9.97 | 10.03 | 59.79 |
| 42 | 10.99 | – | 65.92 |
| 45 | 12.61 | 12.69 | 75.67 |
| 50 | 15.57 | 15.67 | 93.42 |
| 55 | 18.84 | 18.96 | 113.04 |
| 60 | 22.42 | 22.56 | 134.53 |
| 65 | 26.31 | 26.48 | 157.89 |
| 70 | 30.52 | 30.71 | 183.11 |
| 75 | 35.03 | 35.25 | 210.20 |
| 80 | 39.86 | 40.11 | 239.16 |
| 90 | 50.45 | 50.77 | 302.69 |
| 100 | 62.28 | 62.67 | 373.69 |
303 is listed from Ø4 to Ø60 mm; 316L is not listed in Ø28 and Ø42.
Square and hexagon bar weight
| Size (mm) | kg/m | 6 m bar (kg) |
|---|---|---|
| 6×6 | 0.285 | 1.71 |
| 8×8 | 0.508 | 3.05 |
| 10×10 | 0.793 | 4.76 |
| 12×12 | 1.14 | 6.85 |
| 14×14 | 1.55 | 9.33 |
| 16×16 | 2.03 | 12.18 |
| 20×20 | 3.17 | 19.03 |
| 25×25 | 4.96 | 29.74 |
| 30×30 | 7.14 | 42.82 |
| 40×40 | 12.69 | 76.13 |
| Across flats (mm) | kg/m | 3 m bar (kg) |
|---|---|---|
| 10 | 0.687 | 2.06 |
| 13 | 1.16 | 3.48 |
| 17 | 1.98 | 5.95 |
| 19 | 2.48 | 7.44 |
| 22 | 3.32 | 9.97 |
| 24 | 3.96 | 11.87 |
| 27 | 5.01 | 15.02 |
| 32 | 7.03 | 21.10 |
| 36 | 8.90 | 26.70 |
| 41 | 11.54 | 34.63 |
| 46 | 14.53 | 43.60 |
| 50 | 17.17 | 51.51 |
| 55 | 20.77 | 62.32 |
| 60 | 24.72 | 74.17 |
Stainless steel flat bar weight
| Width (mm) | 5 | 10 | 15 | 20 | 25 |
|---|---|---|---|---|---|
| 10 | 0.396 | – | – | – | – |
| 15 | 0.595 | – | – | – | – |
| 20 | 0.793 | 1.59 | – | – | – |
| 25 | 0.991 | 1.98 | – | – | – |
| 30 | 1.19 | 2.38 | 3.57 | 4.76 | – |
| 40 | 1.59 | 3.17 | 4.76 | 6.34 | – |
| 50 | 1.98 | 3.96 | 5.95 | 7.93 | – |
| 60 | 2.38 | 4.76 | 7.14 | 9.52 | – |
| 70 | 2.78 | 5.55 | 8.33 | – | – |
| 80 | 3.17 | 6.34 | 9.52 | 12.69 | – |
| 100 | 3.96 | 7.93 | 11.89 | 15.86 | 19.82 |
| 120 | – | 9.52 | 14.27 | 19.03 | – |
| 150 | – | 11.89 | 17.84 | 23.79 | 29.74 |
Column headings are the thickness in mm. 316L flat bar is listed in a shorter range, from 20 × 5 to 100 × 15 mm; multiply the 304 figure by 1.006 for 316L.
Stainless steel angle weight
| Size (mm) | Grade | kg/m | 6 m length (kg) |
|---|---|---|---|
| 20×20×3 | 304, 316L | 0.880 | 5.28 |
| 25×25×3 | 304, 316L | 1.12 | 6.71 |
| 30×30×3 | 304, 316L | 1.36 | 8.14 |
| 40×40×3 | 304, 316L | 1.83 | 10.99 |
| 50×50×3 | 304 | 2.31 | 13.85 |
| 50×50×5 | 316L | 3.79 | 22.74 |
Rolled angles have a root radius, so a weighed bar can come out slightly heavier than the estimate. For the difference between the grades see 304 vs 316 stainless steel; carbon steel bar weights are in the steel bar weight chart.
How much does a 6 m stainless steel round bar weigh?
Multiply kg/m by 6. A Ø20 bar in 304 weighs 2.49 kg/m, so a 6 m bar weighs about 15.0 kg; a Ø50 bar weighs 15.57 kg/m, or about 93.4 kg per 6 m.
Is 316L heavier than 304?
Slightly. 316L has a density of about 7.98 kg/dm³ against 7.93 kg/dm³ for 304, so the same bar in 316L is about 0.6% heavier.
How do I work out the weight of a stainless flat bar?
Multiply width by thickness in mm and by 0.00793. A 100 × 10 flat in 304 weighs 100 × 10 × 0.00793 = 7.93 kg/m.
Why does a delivered bar not match the table exactly?
The tables use nominal sizes. Rolling and drawing tolerances, and the root radius on angles, make real bars a little heavier or lighter, so invoices are based on the weighed or calculated weight agreed in the order.
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