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Enter outside diameter, wall thickness and length to get theoretical weight in kg and lb. Select the grade so the correct density is used — austenitic stainless is around 2% heavier than carbon steel, and calculators that assume 7850 kg/m³ under-report it.
W = π × t × (D − t) × ρ ÷ 10⁶
W in kg/m, D = outside diameter (mm), t = wall thickness (mm), ρ = density (kg/m³). The (D − t) term is the mean diameter of the annulus, so this is exact for a perfect tube rather than an approximation.
The shortcut W = 0.02466 × t × (D − t) used on many sites is this same formula with carbon steel's density already folded in — which is why it under-reports austenitic stainless by about 2%. Selecting the grade above fixes that.
Theoretical weight only. Actual weight varies with dimensional tolerance within the product specification. Use this for estimating, freight planning and budgetary costing; confirm invoiced weight against the mill test certificate.
Send us the grade, dimensions and quantity you have worked out here, with any specification or certification your project requires.
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