Work out structural steel quantity instantly with clear inputs, formula shown and shareable results.
Structural steel is bought and priced by weight, so quantity is member length times the section's kilograms per metre times the number of members. A five to ten percent allowance covers cutting waste, cleats, stiffeners, base plates and bolts that are not in the member schedule.
Steel weight
kg = length x kg per metre x number of members
Order weight
Tonnes = net kg x (1 + allowance) / 1000
kg = length x kg per metre x number of members. Structural steel is bought and priced by weight, so quantity is member length times the section's kilograms per metre times the number of members.
On a detailed take-off yes, because fabricated connections can add 8-12 percent on a braced frame. The percentage allowance here is for early estimating.
This calculator takes 4 inputs: Length per member, Section weight, Number of members, Wastage and connections allowance. The pre-filled defaults are a realistic worked example — replace them with your own site or project figures.