How to calculate weight of unequal angle?

For unequal angles (ISA or standard), use: Weight (kg) = t × (A + B − t) × 10⁻⁶ × Length (m) × Density (kg/m³) × Quantity. Example: MS unequal angle 75×50×8 mm, 1 m long → Area = 8 × (75 + 50 − 8) = 8 × 117 = 936 mm² → Weight = 936 × 10⁻⁶ × 1 × 7,850 = 7.35 kg. Select 'Unequal (A×B)' in the calculator above and enter both leg dimensions separately.

What is the density of mild steel angle?

Mild steel (MS) has a density of 7,850 kg/m³ or 7.85 g/cm³. This is the standard value used across the steel industry in India and globally for structural steel angles as per IS 808. In imperial units, mild steel density is approximately 490 lb/ft³. EN8 steel has the same density as MS (7,850 kg/m³), while stainless steel SS 304 is slightly higher at 8,000 kg/m³.

Angle Weight Calculator

Units

Angle Type

Material

Leg Length (A=B) (mm)

Thickness (mm)

Length (m)

Quantity

Cost estimate

Use price per kg for the selected units.

Equal Angle · Mild Steel (MS)

50 × 50 × 6 mm · 1 m each

Total weight

4.43kg

9.76 lb

Weight Breakdown

Linear weight, dimensions, and material details

Weight per meter

4.427kg/m

2.975 lb/ft

Weight per foot

2.975lb/ft

4.427 kg/m

Cross-section area

564 mm²

0.8742 in²

Volume per piece

564 cm³

34.4174 in³

Formula Used

The exact formula applied for equal angle weight

Equal Angle

Weight (kg) = t × (2L − t) × 10⁻⁶ × Lₘ × ρ × Q

t = thickness (mm) · L = leg length (mm) · 2L−t avoids double-counting the corner · Lₘ = length (m) · ρ = density (kg/m³) · Q = quantity

Density (ρ) = 7850 kg/m³ (Mild Steel (MS))

How to Use the Angle Weight Calculator

Calculate equal and unequal angle weight in seconds with these 4 simple steps

Select Angle Type

Choose between Equal Angle (both legs identical, e.g., 50×50×6) and Unequal Angle (different leg lengths, e.g., 75×50×8). The calculator uses the appropriate cross-section area formula for each type — t×(2L−t) for equal, t×(A+B−t) for unequal.

Enter Dimensions & Quantity

Input leg length(s) and thickness in metric (mm, m) or imperial (in, ft). For unequal angles, Leg B appears as a separate field. Adjust quantity for batch orders and optionally enable cost estimation per kg or lb.

Select Material Grade

Choose from 6 preset materials — Mild Steel (MS, 7,850 kg/m³), Stainless Steel SS 304 (8,000 kg/m³), EN8 Steel (7,850 kg/m³), Aluminum (2,700 kg/m³), Brass (8,530 kg/m³), and Copper (8,960 kg/m³). Use Custom Density for any other material or alloy.

Review the Results

Get total weight in kg and lb, weight per meter (kg/m), weight per foot (lb/ft), cross-section area (mm²), volume (cm³), and optional cost estimate. The formula card shows the exact calculation applied with your current values.

Angle Weight Calculation Formula

The fundamental formulas for equal and unequal angle weight

Equal Angle: Weight (kg) = t × (2L − t) × 10⁻⁶ × Length × ρ × Q

t = thickness (mm) · L = leg length (mm) · 2L−t avoids double-counting corner · Length (m) · ρ = density (kg/m³) · Q = quantity

Unequal Angle: Weight (kg) = t × (A + B − t) × 10⁻⁶ × Length × ρ × Q

t = thickness (mm) · A = long leg (mm) · B = short leg (mm) · A+B−t avoids double-counting corner · Length (m) · ρ = density (kg/m³) · Q = quantity

Worked Example — Equal Angle:

MS equal angle 50×50×6 mm, 1 meter long, quantity 1:

Cross-section area = 6 × (2×50 − 6) = 6 × 94 = 564 mm²
Weight = 564 × 10⁻⁶ × 1 × 7,850 × 1
Weight = 4.43 kg (or 9.77 lb)

Worked Example — Unequal Angle:

MS unequal angle 75×50×8 mm, 1 meter long, quantity 1:

Cross-section area = 8 × (75 + 50 − 8) = 8 × 117 = 936 mm²
Weight = 936 × 10⁻⁶ × 1 × 7,850 × 1
Weight = 7.35 kg (or 16.20 lb)

Example Calculations

Real-world angle weight examples for common materials and sizes

MS Equal Angle 50×50×6 mm, 1 m

Equal 50×50×6 mm · Length 1 m

Mild Steel (7,850 kg/m³)

4.43 kg/m · 2.98 lb/ft

Result

4.43 kg

MS Unequal Angle 75×50×8 mm, 1 m

Unequal 75×50×8 mm · Length 1 m

Mild Steel (7,850 kg/m³)

7.35 kg/m · 4.94 lb/ft

Result

7.35 kg

SS 304 Equal Angle 40×40×5 mm, 2 m

Equal 40×40×5 mm · Length 2 m

Stainless Steel SS 304 (8,000 kg/m³)

3.00 kg/m · 2.02 lb/ft

Result

6.00 kg

Aluminum Equal Angle 2×2×1/4 in, 3 ft

Equal 2×2×0.25 in · Length 3 ft

Aluminum (2,700 kg/m³)

1.10 lb/ft · 1.63 kg/m

Result

3.29 lb

Material Densities for Angle Weight

Standard density values for common angle materials

Material	Density (kg/m³)	Common Use
Mild Steel (MS)	7,850	General construction, fabrication, structural
Stainless Steel (SS 304)	8,000	Corrosion-resistant, food grade, medical
EN8 Steel	7,850	Medium carbon steel, shafts, axles, studs
Aluminum	2,700	Lightweight, aerospace, automotive, frames
Brass	8,530	Decorative, plumbing fittings, electrical
Copper	8,960	Electrical conductors, busbars, plumbing

Tips for Accurate Angle Weight Estimation

Practical advice for getting the most accurate weight estimates

For MS angles, always confirm whether you need theoretical weight or actual weight. Indian standard IS 808 allows a ±2.5% tolerance on actual weight vs theoretical weight for hot-rolled steel angles.

Aluminum angles are about 65% lighter than mild steel (2,700 vs 7,850 kg/m³). If you're substituting aluminum for steel, the same dimensions will weigh roughly one-third as much — important for structural load calculations.

Stainless steel (SS 304) angles are approximately 2% heavier than MS. For a 100 kg MS order, the SS equivalent would be about 102 kg — significant for procurement and shipping cost estimation.

ISA (Indian Standard Angle) sizes like ISA 50×50×6 follow the same formula as any equal angle. The 'ISA' prefix just indicates the Indian standard designation — the weight calculation is identical to any other equal angle.

For galvanized angles, the zinc coating adds negligible weight (typically less than 0.5%). Use the base steel density for estimates — the coating weight is within manufacturing tolerance.

Common Mistakes to Avoid

Don't let these errors cost you time and money

Using the wrong formula for unequal angles

For unequal angles, use t×(A+B−t), not t×(2A−t). The two legs have different lengths — using the equal-angle formula with the longer leg will overestimate the weight. Always select the correct angle type.

Measuring leg length from the outside vs inside edge

Leg length is measured from the outer edge, not the inner edge. The formula t×(2L−t) already accounts for the corner overlap — do not subtract the thickness from the leg length before entering it.

Mixing metric and imperial units

A 50 mm leg and a 2 inch leg give very different results (2 in = 50.8 mm). Always verify your unit system before entering dimensions — check the unit labels next to each input field.

Forgetting that MS and SS 304 have different densities

Mild steel (7,850 kg/m³) and stainless steel (8,000 kg/m³) differ by about 2%. For a 100 kg MS angle order, the SS 304 equivalent would be about 102 kg — significant for procurement and cost estimation.

Frequently Asked Questions

Common questions about angle weight calculation

For an equal MS angle, use: Weight (kg) = t × (2L − t) × 10⁻⁶ × Length (m) × 7,850 × Quantity, where t = thickness (mm) and L = leg length (mm). For example, a 50×50×6 mm MS equal angle, 1 meter long: Area = 6 × (100 − 6) = 564 mm², Weight = 564 × 10⁻⁶ × 1 × 7,850 = 4.43 kg. For unequal angles, use t × (A + B − t) instead. Use the calculator above — select your angle type and material, enter dimensions, and get instant results.

Two formulas are used depending on the angle type. Equal angle (both legs same): Weight = t × (2L − t) × 10⁻⁶ × Length × Density × Quantity. Unequal angle (different legs): Weight = t × (A + B − t) × 10⁻⁶ × Length × Density × Quantity. The (2L−t) or (A+B−t) term calculates the flattened width of the L-section — subtracting t avoids double-counting the corner where the two legs meet. t = thickness, L/A/B = leg lengths, all in mm.

A 50×50×6 mm MS equal angle weighs approximately 4.43 kg per meter (or 2.98 lb/ft). Calculation: cross-section area = 6 × (2×50 − 6) = 6 × 94 = 564 mm², weight per meter = 564 × 10⁻⁶ × 7,850 = 4.43 kg/m. Other common sizes: 40×40×5 = 2.98 kg/m, 65×65×6 = 5.82 kg/m, 75×75×8 = 8.91 kg/m, 100×100×10 = 14.90 kg/m. Use the calculator with length set to 1 m to find the exact kg/m for any dimensions.

Equal angles have both legs the same length (e.g., 50×50×6) and use the formula t×(2L−t). Unequal angles have different leg lengths (e.g., 75×50×8) and use t×(A+B−t). Under both formulas, the weight depends only on the sum of the leg lengths and the thickness — not on how the total is split between the two legs. For example, an equal 50×50×5 (leg sum 100 mm) and an unequal 90×10×5 (leg sum 100 mm) produce the exact same weight of 3.73 kg/m. The difference between equal and unequal angles is structural (load distribution, connection design), not weight. The calculator handles both types — just toggle the angle type selector.

Stainless steel (SS 304) angle weight uses the same formula but with SS density of 8,000 kg/m³ instead of MS 7,850 kg/m³. This makes SS angles about 1.9% heavier than MS angles of the same dimensions. For a 40×40×5 mm SS equal angle, 2 meters long: Area = 5 × (80 − 5) = 375 mm², Weight = 375 × 10⁻⁶ × 2 × 8,000 = 6.00 kg. Compare with MS: 375 × 10⁻⁶ × 2 × 7,850 = 5.89 kg — a 0.11 kg difference. Select 'Stainless Steel (SS 304)' from the material dropdown.

ISA stands for Indian Standard Angle, designated as per IS 808. Common ISA sizes include ISA 50×50×6, ISA 65×65×6, ISA 75×75×8 for equal angles, and ISA 75×50×8, ISA 100×75×10 for unequal angles. The weight calculation is identical to any other angle — the 'ISA' prefix only indicates the Indian standard designation. Use this calculator for all ISA angle sizes: select equal or unequal, enter the dimensions from the ISA designation, and choose the material.

Yes. Select 'Aluminum' from the material dropdown — it uses a density of 2,700 kg/m³. Aluminum angles are about 65% lighter than MS angles of the same dimensions. For example, a 50×50×6 mm aluminum equal angle, 1 m long: Area = 6 × (100 − 6) = 564 mm², Weight = 564 × 10⁻⁶ × 1 × 2,700 = 1.52 kg (vs 4.43 kg for MS). This weight difference is critical for structural applications where aluminum is substituted for steel.

This calculator provides theoretical weight based on the standard geometric formula and material densities. The results are accurate to within ±2.5% for most hot-rolled angles (matching IS 808 tolerance). Actual weight may vary slightly due to manufacturing tolerances, rolling margins, and surface finish. For galvanized or coated angles, the coating adds negligible weight (under 0.5%). For critical applications, always confirm with the mill test certificate from your supplier.

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Last updated May 24, 2026

Angle Weight Calculator

Weight Breakdown

Formula Used

How to Use the Angle Weight Calculator

Select Angle Type

Enter Dimensions & Quantity

Select Material Grade

Review the Results

Angle Weight Calculation Formula

Example Calculations

Material Densities for Angle Weight

Tips for Accurate Angle Weight Estimation

Common Mistakes to Avoid

Frequently Asked Questions

Embed Angle Weight Calculator

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