Steel angle weight calculator
Equal and unequal angles to EN 10056-1, from L 20×20×3 to L 200×200×20. Pick the size, enter length and quantity — mass per metre comes from the standard's table.
Short answer
The sizes asked for most: L 30×30×3 — 1.36 kg/m, L 40×40×4 — 2.42 kg/m, L 50×50×5 — 3.77 kg/m, L 60×60×6 — 5.42 kg/m, L 80×80×8 — 9.63 kg/m, L 100×100×10 — 15.0 kg/m. Stock lengths are usually 6 m, less often 12 m.
Section tables
Leg a, second leg b, thickness t,
mass per metre and cross-sectional area A. On an equal angle
a = b.
Equal angles — EN 10056-1
| Section | a, mm | b, mm | t, mm | Mass, kg/m | A, cm² |
|---|---|---|---|---|---|
| L 20×20×3 | 20 | 20 | 3 | 0.88 | 1.12 |
| L 25×25×3 | 25 | 25 | 3 | 1.12 | 1.42 |
| L 25×25×4 | 25 | 25 | 4 | 1.45 | 1.85 |
| L 30×30×3 | 30 | 30 | 3 | 1.36 | 1.74 |
| L 30×30×4 | 30 | 30 | 4 | 1.78 | 2.27 |
| L 35×35×4 | 35 | 35 | 4 | 2.09 | 2.67 |
| L 40×40×4 | 40 | 40 | 4 | 2.42 | 3.08 |
| L 40×40×5 | 40 | 40 | 5 | 2.97 | 3.79 |
| L 45×45×5 | 45 | 45 | 5 | 3.38 | 4.3 |
| L 50×50×5 | 50 | 50 | 5 | 3.77 | 4.8 |
| L 50×50×6 | 50 | 50 | 6 | 4.47 | 5.69 |
| L 60×60×6 | 60 | 60 | 6 | 5.42 | 6.91 |
| L 60×60×8 | 60 | 60 | 8 | 7.09 | 9.03 |
| L 70×70×7 | 70 | 70 | 7 | 7.38 | 9.4 |
| L 80×80×8 | 80 | 80 | 8 | 9.63 | 12.3 |
| L 90×90×9 | 90 | 90 | 9 | 12.2 | 15.5 |
| L 100×100×10 | 100 | 100 | 10 | 15 | 19.2 |
| L 100×100×12 | 100 | 100 | 12 | 17.8 | 22.7 |
| L 120×120×12 | 120 | 120 | 12 | 21.6 | 27.5 |
| L 150×150×15 | 150 | 150 | 15 | 33.8 | 43 |
| L 200×200×20 | 200 | 200 | 20 | 59.9 | 76.3 |
Unequal angles — EN 10056-1
| Section | a, mm | b, mm | t, mm | Mass, kg/m | A, cm² |
|---|---|---|---|---|---|
| L 40×20×4 | 40 | 20 | 4 | 1.77 | 2.26 |
| L 50×30×5 | 50 | 30 | 5 | 2.96 | 3.78 |
| L 60×40×5 | 60 | 40 | 5 | 3.79 | 4.79 |
| L 60×40×6 | 60 | 40 | 6 | 4.46 | 5.68 |
| L 65×50×5 | 65 | 50 | 5 | 4.35 | 5.54 |
| L 70×50×6 | 70 | 50 | 6 | 5.41 | 6.89 |
| L 75×50×7 | 75 | 50 | 7 | 6.48 | 8.3 |
| L 80×40×6 | 80 | 40 | 6 | 5.41 | 6.89 |
| L 80×60×7 | 80 | 60 | 7 | 7.36 | 9.38 |
| L 100×50×8 | 100 | 50 | 8 | 8.97 | 11.4 |
| L 100×65×8 | 100 | 65 | 8 | 9.94 | 12.7 |
| L 100×75×8 | 100 | 75 | 8 | 10.6 | 13.5 |
| L 120×80×8 | 120 | 80 | 8 | 12.2 | 15.5 |
| L 150×90×10 | 150 | 90 | 10 | 18.2 | 23.2 |
| L 150×100×10 | 150 | 100 | 10 | 19 | 24.2 |
| L 200×100×10 | 200 | 100 | 10 | 23 | 29.2 |
Shape and mass tolerances for angles are in EN 10056-2. Settlement goes by the certified mass — the table is for design and estimating.
EN 10056-1 sizes are close to the American L shapes but not identical: the radii differ, and with them the mass per metre for the same numbers in the designation. For angles bought to ASTM, take the mass from that standard's own table.
Where the gap between formula and table comes from
An angle section gets estimated as two rectangles without the overlap:
F = (a + b − t) · t. The formula is convenient and out by
1–3 %, because it ignores the root radius in the inner corner
(r₁) and the radius at the leg tips (r₂). The corner
radius adds material and the tips take it away, and the two effects do not
cancel.
In practice: for a quick estimate on site the formula will do, for an order and a quotation it will not. The same holds for beams and channels, only there the gap is wider because the flange taper joins in.
The angle in a welded structure
An angle is the cheapest way to stiffen something and the commonest member in a truss, but it has one awkward property: it is not symmetrical. The centroid lies off the leg axis, so a weld on one side pulls the section sideways and the part twists out of plane as it cools.
Hence two shop rules. First, in a truss the welds on the two legs are distributed so their resultant passes through the centroid of the section — unequal weld lengths on the two sides are correct here, not a mistake. Second, long angles are tacked to a marked line and welded in alternating runs, never continuously.
Weld size follows the thinner part; converting leg z to design
throat a is in the
fillet weld size
calculator, and deposited metal and electrodes for a whole truss in the
electrode
consumption calculator.
Frequently asked questions
How much does a 50×50×5 angle weigh?
3.77 kg per metre, so 22.6 kg over a 6 m length. A 40×40×4 angle weighs 2.42 kg/m and a 60×60×6 weighs 5.42 kg/m.
Why does the angle mass not match the formula (a + b − t) · t?
Because the formula knows nothing about the radii. An angle has a root radius in the inner corner and a radius at the leg tips, so the real section differs slightly from two rectangles. For 50×50×5 the formula gives 3.71 kg/m against 3.77 in the table. The gap grows on thicker sections, which is why the calculator above reads values from the EN 10056-1 table rather than computing them.
How do I size a fillet weld on an angle?
Design throat a should not exceed 0.7 of the thinner part. For a 50×50×5 angle that is a ≈ 3.5 mm, i.e. a leg of z = 5 mm. A larger weld adds nothing to the strength of the joint but does put in more heat and pull the part out of shape.
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