Steel Angle Weight Calculator

Calculate steel angle weight for equal and unequal leg angles. Enter the two legs and the thickness — the calculator uses the standard area formula (a + b − t) × t.

Angle weight

Leg A (mm)

Leg B (mm)

Thickness (mm)

Material

Length

Unit

Quantity

—

Nominal weight from dimensions and density. Actual weight varies with mill tolerance and coating — check the mill certificate for critical use.

Equal angle weights

Angle	kg/m (formula)	lb/ft
25×25×3 mm	1.11	0.74
30×30×3 mm	1.34	0.90
40×40×4 mm	2.39	1.60
50×50×5 mm	3.73	2.51
60×60×6 mm	5.37	3.61
65×65×6 mm	5.84	3.92
75×75×6 mm	6.78	4.56
80×80×8 mm	9.55	6.41
100×100×10 mm	14.91	10.02
120×120×12 mm	21.48	14.43
150×150×15 mm	33.56	22.55

Published mill tables run about 1–2% heavier than the simple formula because rolled angles have a root radius and toe fillets that the (a + b − t) × t approximation ignores.

Frequently asked questions

How do you calculate the weight of a steel angle?

Cross-sectional area is approximately (leg A + leg B - thickness) x thickness. Multiply by length and by density 7.85 g/cm3.

Does it work for unequal angles?

Yes — enter the two different leg lengths.

Why is my supplier's weight slightly higher?

Rolled angles have a root radius and toe fillets that add a little material beyond the simple rectangle approximation, typically 1-2%.

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