Work out angle iron weight instantly with clear inputs, formula shown and shareable results.
An angle is two rectangles that share a corner, so its area is (leg A + leg B - thickness) x thickness, subtracting the overlap that would otherwise be counted twice. Multiplying by steel density gives kilograms per metre, ignoring the small root radius fillet which adds under one percent.
Section area
A = (leg A + leg B - thickness) x thickness
Unit weight
kg/m = A mm² x 7.85 / 1000
A = (leg A + leg B - thickness) x thickness. An angle is two rectangles that share a corner, so its area is (leg A + leg B - thickness) x thickness, subtracting the overlap that would otherwise be counted twice.
Rolled angles have a fillet at the root and rounded toes. The fillet adds material the simple rectangle model misses, typically half to one percent.
This calculator takes 4 inputs: First leg length, Second leg length, Leg thickness, Length of angle. The pre-filled defaults are a realistic worked example — replace them with your own site or project figures.