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Angle Weight Calculator

Calculate MS angle iron weight per meter and per piece using the standard (2L - T) × T × 0.00785 formula. Supports equal and unequal leg angles.

What is the Angle Weight Calculator?

The angle weight calculator is an engineering tool that computes the weight of MS angle iron sections based on their leg dimensions and thickness. Using the standard formula (2L - T) × T × 0.00785, it delivers accurate weight per meter, per piece, and total weight for L-shaped structural steel angles. It supports both equal leg angles (where both legs are the same length) and unequal leg angles, making it versatile for different structural applications.

Angle sections are one of the most fundamental structural steel shapes, used extensively in building frames, trusses, bridges, transmission towers, industrial sheds, and fabrication work. Their L-shaped cross-section provides excellent strength-to-weight ratio for resisting bending, compression, and tension forces. Accurate weight calculation is essential for structural design, cost estimation, procurement, and logistics planning.

How to Use the Angle Weight Calculator

Using this calculator is simple and intuitive:

  1. Select Angle Type: Choose Equal or Unequal angle. For equal angles, both legs share the same length.
  2. Enter Leg Length(s): For equal angles, enter the leg length (e.g., 50mm). For unequal, enter both leg lengths (e.g., 75mm and 50mm).
  3. Enter Thickness: Input the angle thickness in millimeters.
  4. Enter Length and Quantity: Specify the length per piece (typically 6m) and the number of pieces.
  5. Calculate: Click Calculate to get instant weight results.

The calculator automatically uses the correct formula: (2L - T) × T × 0.00785 for equal angles and (L1 + L2 - T) × T × 0.00785 for unequal angles.

Angle Weight Formula and Derivation

The formula for equal angle weight is: W = (2L - T) × T × 0.00785 × Length. For unequal angles: W = (L1 + L2 - T) × T × 0.00785 × Length. The cross-sectional area of an angle is calculated by splitting the L-shape into two rectangles: one rectangle is L × T, and the other is (L - T) × T. So total area = L×T + (L-T)×T = T(2L - T). Weight per meter = Area × 7.85 × 10⁻⁶ m²/mm² × 1000 = Area × 0.00785. This gives the weight in kg per meter.

Applications of Steel Angles

Steel angles are one of the most versatile structural sections. In building construction, they form roof trusses, column bracing, lintels over openings, and wall support systems. In industrial settings, they create equipment frames, conveyor supports, pipe racks, and cable trays. In infrastructure, they are used in transmission line towers, railway signal posts, highway sign structures, and bridge cross-bracing. In residential and commercial fabrication, they make gates, window frames, shelving units, and stair stringers. Their availability in many sizes and their ease of welding, drilling, and bolting make them a go-to choice for engineers and fabricators worldwide.

Frequently Asked Questions

How to calculate angle weight?
Angle weight is calculated using the formula: W = (2L - T) × T × 0.00785 × length (m) × quantity, where L is the leg length in mm and T is the thickness in mm. For example, a 50×50×6mm angle of 6m length: (2 × 50 - 6) × 6 × 0.00785 × 6 = 94 × 6 × 0.00785 × 6 = 26.56 kg per piece.
What is the angle weight formula?
The standard angle weight formula is W = (2L - T) × T × 0.00785 × Lm, where L = leg length (mm), T = thickness (mm), Lm = length (m). For unequal angles: W = (L1 + L2 - T) × T × 0.00785 × Lm. The constant 0.00785 converts the cross-sectional area (mm²) to kg per meter length, derived from steel density 7850 kg/m³ divided by 10⁶.
What is the weight of 50×50×6 mm MS angle?
A 50×50×6mm MS equal angle weighs approximately 4.43 kg per meter. Per piece for 6m length: 4.43 × 6 = 26.56 kg. Per piece for 12m length: 4.43 × 12 = 53.12 kg. This size is commonly used in structural frames, trusses, and support brackets.
What is the weight of 40×40×5 mm MS angle?
A 40×40×5mm MS angle weighs approximately 2.94 kg per meter. Calculation: (2 × 40 - 5) × 5 × 0.00785 = 75 × 5 × 0.00785 = 2.94 kg/m. Per 6m: 17.66 kg. This size is used for light structural frames, grills, and fabrication work.
What is the weight of 65×65×6 mm MS angle?
A 65×65×6mm MS angle weighs approximately 5.84 kg per meter. Calculation: (2 × 65 - 6) × 6 × 0.00785 = 124 × 6 × 0.00785 = 5.84 kg/m. Per 6m: 35.05 kg. This is a medium structural size used in building frames and industrial structures.
What is the weight of 75×75×8 mm MS angle?
A 75×75×8mm MS angle weighs approximately 8.92 kg per meter. Calculation: (2 × 75 - 8) × 8 × 0.00785 = 142 × 8 × 0.00785 = 8.92 kg/m. Per 6m: 53.51 kg. Used in heavy structural frames, bridge components, and industrial sheds.
What is the weight of 100×100×10 mm MS angle?
A 100×100×10mm MS angle weighs approximately 14.92 kg per meter. Calculation: (2 × 100 - 10) × 10 × 0.00785 = 190 × 10 × 0.00785 = 14.92 kg/m. Per 6m: 89.49 kg. This is a heavy structural section used in columns, beams, and heavy industrial applications.
How to calculate unequal angle weight?
For unequal angles (e.g., 75×50×6mm), use the formula: W = (L1 + L2 - T) × T × 0.00785 × length. L1 is the longer leg, L2 is the shorter leg. Example: 75×50×6mm angle: (75 + 50 - 6) × 6 × 0.00785 = 119 × 6 × 0.00785 = 5.60 kg/m.
What is standard angle iron size?
Standard MS angle sizes range from 20×20×3mm to 200×200×20mm (equal angles) and 30×20×3mm to 150×75×12mm (unequal angles). Common stock lengths are 6m and 12m. Popular sizes include 25×25×5, 40×40×5, 50×50×6, 65×65×6, 75×75×8, and 100×100×10 mm.
What is the difference between angle iron and MS angle?
Angle iron and MS angle refer to the same product — a structural steel section with an L-shaped cross-section. "Angle iron" is a traditional term from when angles were made of wrought iron. Today, they are made of mild steel (MS angle). Both terms are used interchangeably. The weight calculation is identical.
What is the weight of 25×25×5 mm MS angle?
A 25×25×5mm MS angle weighs approximately 1.77 kg per meter. Calculation: (2 × 25 - 5) × 5 × 0.00785 = 45 × 5 × 0.00785 = 1.77 kg/m. Per 6m: 10.60 kg. This small angle is used for light frames, brackets, and supports.
How do you calculate angle iron weight per foot?
To calculate angle iron weight per foot in pounds: W (lb/ft) = W (kg/m) × 0.672. Or use the direct formula for imperial: W = (2L - T) × T × 0.00522 per foot, where L and T are in inches. Example: 2" × 2" × ¼" angle: (4 - 0.25) × 0.25 × 0.00522 = 0.00489 lb/ft.
What are common applications of MS angles?
MS angles are used in structural steel frames for buildings, bridges, towers, sheds, and mezzanines. They serve as brackets, supports, lintels, and bracing members. In fabrication, they make frames for machinery, gates, doors, window frames, and shelving. In infrastructure, they appear in transmission towers, railway platforms, and sign structures.
How many types of steel angles are there?
Steel angles come in two main types: equal angles (both legs same length) and unequal angles (legs of different lengths). Within each type, variations include: hot-rolled angles (standard structural), cold-formed angles (light gauge), stainless steel angles (corrosion resistant), and aluminum angles (lightweight). Each has the same weight calculation method but uses its material density constant.

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