Structural Steel Cost Calculator

Total Steel Weight has the largest measured effect on Total Installed Cost of any single input, because it scales three of the five cost components at once -- Material Cost, Fabrication Cost, and Erection Cost all multiply directly by tonnage, while Connection Cost and the Misc Metals percentage add-on do not. Steel Price per Ton, Fabrication Cost per Ton, and Erection Cost per Ton each only move their own single line item, so none of them alone can match tonnage's combined reach across three cost categories at once. Connection Cost is priced at a single flat $275 average per connection regardless of connection type or complexity, so Number of Connections moves that one line item in direct proportion but has no effect on Material, Fabrication, or Erection costs.

Misc Metals Percentage is applied last, as a percentage of the SUBTOTAL of the other four cost categories combined -- so its dollar impact automatically scales with whatever those other costs already add up to, rather than being a fixed dollar figure you set directly. Cost per Pound simply restates Total Installed Cost on a per-pound basis (total divided by weight in pounds), so it moves in the same direction as every cost-per-ton input but is diluted by Total Steel Weight in the denominator. This calculator does not distinguish structural shapes, grades, or connection types beyond the flat unit rates you enter, so treat it as a budgeting tool for early design, not a substitute for a detailed subcontractor bid.