Use the formula: Weight = Volume × Density
For a steel bar: Weight = Cross-sectional area × Length × Density
Use steel density as 7850 kg/m³
For a round bar: Weight = (π × d² / 4) × L × 7850
For a square bar: Weight = a² × L × 7850
For a rectangular bar: Weight = (b × h) × L × 7850
If dimensions are in mm, use: Weight in kg = Volume in mm³ × 0.00000785
For a round bar in mm: Weight in kg = d² × L × 0.006165
For a square bar in mm: Weight in kg = a² × L × 0.00785
For a rectangular bar in mm: Weight in kg = b × h × L × 0.00785
Ensure all dimensions use the same unit before calculating
Multiply the result by the number of bars if calculating multiple pieces