Calculate the exact weight of Flat Bars and Rectangular Stock in Mild Steel (MS), Stainless Steel (SS), Aluminium, Copper, and Brass instantly with our free online calculator. Simply enter your width, thickness, and length in mm or inches, and get accurate results in both kg and lbs.
Weight Calculation for Flat Bar and Rectangular Stock
The weight of a Flat Bar (also known as Rectangular Stock or Flat Stock) is determined by its simple rectangular cross-sectional area, length, and material density. Flat bars are among the most versatile structural components, widely used in fabrication, framing, brackets, supports, and decorative metalwork. The standard density for Mild Steel is 7.85 g/cm³, while other engineering materials like Stainless Steel, Aluminium, Copper, and Brass have distinct densities that significantly affect the final weight. Accurate weight calculation is critical for material procurement, logistics planning, scrap valuation, and precise cost estimation in engineering and fabrication projects. For more complex shapes, you can also use our comprehensive Metal Weight Calculator.
Flat Bar Weight Formula and Manual Calculation
The industry-standard formula for calculating flat bar weight is straightforward due to its rectangular geometry:
Weight (kg) = Width (mm) × Thickness (mm) × Length (m) × Density Factor
Density Factors for common materials:
0.00000785 for Mild Steel (MS) & Carbon Steel
0.00000793 for Stainless Steel (SS 304/316)
0.00000270 for Aluminium
0.00000896 for Copper
0.00000850 for Brass
For imperial units (inches and lbs):
Weight (lbs) = Width (in) × Thickness (in) × Length (ft) × 3.4 (for Steel)
Step-by-Step Calculation Example
- Step 1: Identify dimensions: Width = 50 mm, Thickness = 6 mm, Length = 2 m (Mild Steel)
- Step 2: Calculate Cross-Sectional Area: 50 × 6 = 300 mm²
- Step 3: Apply formula: 300 × 2 × 0.00000785
- Step 4: Result: 600 × 0.00000785 = 4.71 kg
- Step 5: Compare with Aluminium: 4.71 × (2.70/7.85) ≈ 1.61 kg
This calculation aligns exactly with the results provided by the MS flat bar weight calculator.
Metal Flat Bar Weight Chart (Quick Reference per Metre)
Frequently Asked Questions
What is the formula for Flat Bar weight in kg?
The formula for Flat Bar weight in kg is: Weight = Width (mm) × Thickness (mm) × Length (m) × 0.00000785 for Mild Steel. This simplified constant is derived from the density of steel (7.85 g/cm³). You can also use the Metal Weight Calculator for instant results across different materials.
How much does a 50x6mm MS Flat Bar weigh per meter?
A standard 50x6mm Mild Steel Flat Bar weighs approximately 2.36 kg per metre. This is calculated as: 50 × 6 × 0.00000785 = 2.355 kg. For a 6-metre length, the total weight would be approximately 14.13 kg.
Is there a difference between Flat Bar and Rectangular Stock?
In general fabrication, "Flat Bar" and "Rectangular Stock" are used interchangeably to describe a solid metal bar with a rectangular cross-section. "Flat Bar" typically refers to wider, thinner sections, while "Rectangular Stock" might imply thicker or more square-like proportions, but the weight calculation method remains identical for both.
Conclusion
Accurately calculating the weight of flat bars and rectangular stock is essential for precise material procurement, cost estimation, and structural planning. Whether you are working with standard Mild Steel, corrosion-resistant Stainless Steel, lightweight Aluminium, or conductive Copper and Brass, using the correct density factor ensures your project estimates are reliable. By utilizing our comprehensive Metal Weight Calculator, you can instantly determine the exact weight in kg or lbs for any flat bar dimension, streamlining your fabrication processes and ensuring efficient resource management.