Technical Reference Article

Industrial Steel Weight Formulas & Calculation Guide

Accurate weight calculation is essential for bill of quantities (BOQ) preparation, freight estimations, structural design load calculations, and raw material procurement. The standard density used for carbon steel is **7850 kg/m³** (0.00000785 kg/mm³).

1. Steel Plate & Sheet Weight Formula

Weight (kg) = Thickness (mm) × Width (m) × Length (m) × 7.85

**Worked Example**: Calculate the weight of a steel plate with thickness 20 mm, width 2.0 m, and length 6.0 m:
Weight = 20 × 2.0 × 6.0 × 7.85 = 1,884 kg (1.884 Metric Tons)

2. Seamless & Welded Steel Pipe Weight Formula

Weight per Meter (kg/m) = (Outside Diameter [mm] - Wall Thickness [mm]) × Wall Thickness [mm] × 0.02466

**Worked Example**: Calculate the weight of a 6-inch Sch 40 pipe (OD = 168.3 mm, Wall = 7.11 mm):
Weight/m = (168.3 - 7.11) × 7.11 × 0.02466 = 28.26 kg/m
For a standard 12-meter pipe length: 28.26 × 12 = 339.1 kg

3. Solid Round Bar Weight Formula

Weight per Meter (kg/m) = Diameter² (mm) × 0.006165

**Worked Example**: Calculate the weight per meter of a 50 mm steel round bar:
Weight/m = 50² × 0.006165 = 15.41 kg/m

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