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Carbon steel pipes with square and rectangular (rectangular) cross-sections: Weight unit per meter: kg/m (kilogram/meter) & lb/ft (lb/ft) Commonly used square tube calculation formula 1: (Length + width)×2÷3.14-thickness×thickness×0.02466= kg/m Formula 2: Kg/m = (Oc-4Wt) * Wt * 0.00785