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The length of the first leg, measured along the outside of the angle.
Outside to the heel, which is how angles are designated: a 100 × 75 × 8 angle has legs of 100 and 75 measured on the outside. Measuring inside the heel gives a figure short by the thickness and produces a weight several per cent light. For an unequal angle, the convention lists the long leg first.
The length of the second leg, measured along the outside of the angle.
For an equal-leg angle, enter the same value as Leg 1.
The uniform thickness of both legs.
Equal on both legs for a standard rolled angle. Thickness matters more to weight than either leg does at the sizes angles come in — doubling the thickness roughly doubles the weight, while lengthening one leg by a quarter adds about an eighth. The root radius at the heel adds a little steel that this calculation ignores, so a weight from the three nominal dimensions runs slightly light against the shape table.
Weight per unit length
10.1 lb/ft
Geometry only, and deliberately an underestimate: the heel fillet and radiused toes are excluded, so a rolled angle weighs slightly more than this — proportionally more on light sections. Use the published shapes table when the exact catalogue weight matters.
- Cross-sectional area
- 2.97 in²
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Steel Angle (L-Shape) Weight Calculator: 10.1 lb/ft — shown in imperial, US market. The link sets both, so the result they see is the one on your screen.
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How this was calculated
Formula source(s)
- Simplified angle cross-sectional area = (leg1 + leg2 − thickness) × thickness, omitting fillet/toe radius area; weight per unit length = area × steel density (7850 kg/m³)
Inputs used
- Leg 1 Length
- 4 in
- Leg 2 Length
- 4 in
- Thickness
- 0.39 in
Intermediate steps
- Cross-sectional area
- 2.97 in²
Confidence note: Geometry only, and deliberately an underestimate: the heel fillet and radiused toes are excluded, so a rolled angle weighs slightly more than this — proportionally more on light sections. Use the published shapes table when the exact catalogue weight matters.
What this calculation does not cover
- Assumes carbon steel at 7850 kg/m³ (490 pcf), and there is no material field to say otherwise. The same L100x100x10 outline is a shade heavier in stainless and about 5.1 kg/m (3.4 lb/ft) in aluminium against 14.9 (10.0 lb/ft) — roughly a third. Weigh aluminium angle with this and every lifting, handling and fixing decision downstream is out by a factor of three.
- Galvanising puts mass back on, and it lands hardest on the light sections. A hot-dip coating runs around 600 g per square metre of surface, and an angle carries a great deal of surface for its weight: about 2 % extra on a 100x100x10, roughly double that on a 40x40x4. On a load bought and craned by weight, that is the opposite correction to the fillets and worth applying alongside them.
- The underestimate holds for a HOT-ROLLED angle and reverses for a formed one. An angle folded from plate on a press brake has no heel fillet at all, only a bend radius that takes metal out of the corner, so this figure runs marginally over rather than under. It matters most when rolled and formed sections are being compared on price by weight.
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This result is a specification — 10.1 lb/ft — not a quantity. Put the thing it sizes into your project: how many, what you call it, and your supplier’s price.
Computed in your browser — nothing you enter is uploaded. Presented in US customary units and US trade terminology. Where a formula follows a published standard, that standard and its edition are cited beside it on this page; where none governs, the page says so. Local amendments override model codes — verify against the code in force where you build.
Sources checked 2026-09-06 · in the site-wide review of 2026-09-06 · v1.0.1
Regulatory standards & verification citations1
- Simplified angle cross-sectional area = (leg1 + leg2 − thickness) × thickness, omitting fillet/toe radius area; weight per unit length = area × steel density (7850 kg/m³)
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