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Weight calculation of rebar

Unit weight of steel=D×D÷162(Kg)  8mm dia =0.395kg 10mm dia=0.617Kg 12mm dia=0.888Kg 16mm dia=1.58kg 20mm dia=2.46Kg 25mm dia=3.85Kg 32mm dia=6.32Kg 40mm dia=9.87Kg