Stainless steel round tube weight
Per-metre and total weight of a stainless round tube from (OD − wall) × wall × coefficient: the diameter accepts 25, φ25, D25 or 25mm, the coefficient defaults to π × 7.93 ÷ 1000 ≈ 0.024914, and the inner diameter plus outer surface area are included.
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Weight result
Approximate formula — weigh for invoicing.
Enter the outer diameter to calculate the tube weight
Per metre: 0 · Total: 0 · Outer diameter: 0
What this tool does
- Estimate material for handrails, guards and racks: fill in OD and wall to get per-metre and per-length weight.
- Recompute a supplier's theoretical weight by swapping the coefficient to π × 7.85 ÷ 1000.
- Budget coating area and lifting weight: outer surface area for paint, total weight for brackets and freight.
Example
Input
φ32
Output
外径 32 mm、壁厚 2 mm 的圆管每米重量：1.49477 kg/m 6 m 总重量：8.968619 kg 内径：28 mm 系数 π × 7.93 ÷ 1000：0.024913 每米外表面积：0.100531 m²/m 公式：(外径 32 − 壁厚 2) × 壁厚 2 × 系数 0.024913 × 长度 6 = 8.968619 kg
A 25 mm OD, 1 mm wall 304 tube is about 0.598 kg per metre; switch the density to 7.85 for the 0.02466 handbook coefficient.
Frequently asked questions
Is 0.02491 exact?
No — it approximates π × 7.93 ÷ 1000. The ring is developed at the mean circumference π(D − t), while the exact volume is π(D² − d²)/4 × L; the difference is tiny, which is why handbooks print 0.02491 (0.02466 for carbon steel). This tool recomputes the coefficient from the density you enter.
Can I type φ25 or D25?
Yes. Prefixes φ, Φ, ø, Ø, D, OD, 外径 and suffixes mm, 毫米 are stripped before parsing, so 25, φ25, D25 and 25mm all work.
Which wall thicknesses are rejected?
The wall must be positive and less than half the outer diameter (so the bore stays positive). A wall at or above the radius is a solid bar — use the round-bar formula 0.00617 × d² × length instead.
Why does it differ from the scale?
Nominal OD and nominal wall are used, while real tubes vary in roundness and wall thickness (often ±10%), and the density depends on the grade. Use it for quotes; weigh for settlement.
Why show the inner diameter?
The bore D − 2t decides flow capacity and whether cables or bolts fit through, so it is listed alongside the weight.
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