Calculate the weight of equal and unequal MS/steel angles by leg dimensions, thickness, length and material. Instant kg, lbs and kg/m results.
Select angle type, enter dimensions, pick material and length — all results update instantly
Step-by-step formula for angle cross-section area and weight
The L-section is made of two rectangles: Leg A = A×t and Leg B = B×t. But the corner square (t×t) is counted twice, so it is subtracted once: Area = A×t + B×t − t² = (A+B−t)×t.
Area is in mm², density is in g/cm³. Multiplying and converting: mm² × mm (1 m = 1000 mm) × g/cm³ → divide by 1,000,000 for cm³ → divide by 1000 for kg. Net: Area × density ÷ 1000 = kg/m.
For mild steel (7.85 g/cm³): kg/m = (A + B − t) × t × 0.00785. Multiplying by 0.00785 combines the density and unit conversion. Useful for mental arithmetic on site.
IS 808:1989 allows ±3% on thickness and ±2.5% on width for hot-rolled angles. Always apply a 3–5% material wastage factor for cutting and procurement — see our Cutting Wastage Planning guide.
Get accurate angle weight results in seconds with these simple steps
Toggle between Equal Angle (both legs same length) and Unequal Angle (different leg lengths) using the buttons at the top.
For equal angle, enter one leg (A). For unequal, enter both Leg A and Leg B in millimetres. Use the ISA reference table below if unsure of your size.
Type the wall/flange thickness (t) in mm. This is the same for both legs in standard rolled angles. Refer to your material certificate or IS 808 table.
Enter the bar length in metres (standard lengths are 6 m and 12 m) and the number of pieces to get the total project weight.
Choose from Mild Steel, Stainless Steel 304/316, Cast Iron, Aluminum, Copper, Brass, Titanium, or enter a custom density in g/cm³.
Results show kg/piece, total kg, kg/m, and lbs equivalents. Cross-check kg/m against the ISA reference table to validate your inputs.
Hot-rolled steel angle weights as per IS 808:1989. Click any row to auto-fill the calculator.
| ISA Designation | Size (mm × mm) | Thickness (mm) | Area (mm²) | kg / m | lbs / ft |
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| ISA Designation | Size (mm × mm) | Thickness (mm) | Area (mm²) | kg / m | lbs / ft |
|---|
* IS 808:1989 (Reaffirmed 2018) — Hot Rolled Steel Equal & Unequal Angles. Density = 7.85 g/cm³. Calculated values using formula: Area = (A+B−t)×t. Reference: BIS IS 808 & ISMC Channel Weight.
Where steel and metal angles are used across different industries
Angles are one of the most versatile structural sections — used as bracing, framing, and connections in steel buildings and bridges.
Mild steel angles are a fabrication shop staple — readily available, easy to cut and weld, suitable for frames, brackets, and supports.
Stainless or galvanized angles resist corrosion in marine environments — used in decks, ladders, and structural members on ships and platforms.
Light to medium angles are the building blocks of warehouse racking, storage systems, and industrial shelving worldwide.
Aluminum and hot-dip galvanized angles are widely used in solar mounting structures and civil infrastructure for their lightweight and durability.
Lightweight aluminum and thin steel angles are used in vehicle body-building, trailers, and transportation infrastructure for weight-critical applications.
Best practices for engineers, estimators, and fabricators
Cross-check your calculated kg/m against the IS 808 table (or the ISA reference table on this page). A mismatch of more than 1% usually means an input error in leg size or thickness.
Standard angle bars come in 6 m or 12 m lengths. Cutting to project sizes wastes 3–5% on average. Always order at least 5% over net quantity. See our Cutting Wastage Planning guide.
Equal angles offer balanced stiffness in both directions — ideal for bracing. Unequal angles (longer vertical leg) are preferred for shelf brackets and lintels where different stiffness on each axis is needed.
The ISA designation (e.g., ISA 75×75×6) uses nominal dimensions. The actual rolled width can vary by ±2–3 mm per IS 808. For precision structures, measure the actual section with a calliper or request mill certificate values.
Hot-dip galvanizing (HDG) adds approximately 0.6 kg/m² of surface area to the bare steel weight. For thin angles, this can add 3–8% to total weight — significant for transport and structural dead load calculations.
Steel distributors quote angles by weight (per tonne). Calculate your total kg from this tool, add wastage, then divide by 1000 for tonnes to price your material and freight requirements accurately.
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Common questions about angle weight calculation answered