Steel weight calculator.
Steel weight is the cross-section area times length times density. A 20 mm carbon steel round bar weighs 2,47 kg per metre at 7.85 g/cm³. Pick the section, material and dimensions to get the mass per metre, per piece and for your quantity, with the formula shown.
Geprüft am 11. Nov. 2026 · Grundlage: Section areas from nominal dimensions (geometry); Densities: ArcelorMittal Orange Book (steel), Swiss Steel 1.4301 data sheet (304), ASSDA (316), EN 1999-1-1 3.2.5 (aluminium) · Fehler melden
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| Size (mm) | Round bar (d) | Square bar (a) | Hex bar (across flats) |
|---|---|---|---|
| 6 | 0,222 | 0,283 | 0,245 |
| 8 | 0,395 | 0,502 | 0,435 |
| 10 | 0,617 | 0,785 | 0,680 |
| 12 | 0,888 | 1,130 | 0,979 |
| 16 | 1,578 | 2,010 | 1,740 |
| 20 | 2,466 | 3,140 | 2,719 |
| 25 | 3,853 | 4,906 | 4,249 |
| 30 | 5,549 | 7,065 | 6,118 |
| 40 | 9,865 | 12,560 | 10,877 |
| 50 | 15,413 | 19,625 | 16,996 |
| 60 | 22,195 | 28,260 | 24,474 |
| 80 | 39,458 | 50,240 | 43,509 |
| 100 | 61,654 | 78,500 | 67,983 |
| Material | Density (g/cm³) | Source |
|---|---|---|
| Carbon or alloy steel | 7.85 | ArcelorMittal Orange Book: mass per metre calculated with steel at 7,850 kg/m³ |
| Stainless 304 / 1.4301 (A2) | 7.9 | Swiss Steel Group data sheet 1.4301 (EN 10088-3): 7.90 kg/dm³ |
| Stainless 316 / 1.4401 (A4) | 8 | ASSDA, 316: the first step up: 8,027 kg/m³ typical, rounded to 8.0 |
| Aluminium alloy | 2.7 | EN 1999-1-1 clause 3.2.5: unit mass 2,700 kg/m³ (as reproduced in SCIA Eurocode training) |
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How do you calculate the weight of steel?
Multiply the cross-section area by the length and the density. In practical units, mass per metre in kg equals the area in mm² times the density in g/cm³, divided by 1,000. Carbon steel is taken at 7.85 g/cm³. Real bars and tubes differ slightly through rolling tolerances and corner radii.
How much does a 20 mm steel round bar weigh per metre?
About 2,47 kg per metre in carbon steel: π/4 × 20² = 314.2 mm², times 7.85 g/cm³, divided by 1,000. A 6 m length is about 14,8 kg. In stainless 316 at 8.0 g/cm³ the same bar is about 2,51 kg per metre.
How do you calculate the weight of a steel tube or pipe?
Use the ring area: π × wall × (outside diameter − wall). A 48.3 mm tube with a 4.0 mm wall has about 557 mm² of steel, so it weighs about 4,37 kg per metre at 7.85 g/cm³. Square and rectangular tubes use outer area minus inner area.
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