Metal weight calculator
Weight of a piece of bar, tube or plate, for ordering stock, postage or checking what a job will weigh.
How it works, guides and notes
How it works
Weight = cross-section area × length × density. Densities are typical values for each alloy; real bar varies by a percent or two, and stock is often supplied slightly oversize, so treat the answer as a close guide rather than an exact figure.
Areas: round πd²/4; tube π(D² − d²)/4; square a²; flat w × t; hex 0.866 × AF². Density in g/cm³ equals tonnes per cubic metre: 1 m of 1000 mm² bar weighs density kg.
Worked example: 300 mm of 25 mm mild steel: area 490.9 mm² × 300 mm × 7.85 g/cm³ = 1.156 kg (3.85 kg per metre).
See the materials list for the density, group and hardness of each material.
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