Choose your project type (concrete building, steel frame or industrial shed) to get an initial estimate of the materials you'll need and their approximate cost. For an exact figure, talk to the AI advisor.
This tool uses different engineering coefficients for each project type, because the lateral load system and the roof type — not just the floor area — are the main drivers of how much material is needed. Sources: several independent Iranian civil-engineering references, each given as a numeric range, and the tool displays that exact same range rather than a single fixed number.
The frame rebar weight (columns and beams) depends on the lateral load system: a moment frame with shear walls, the most common seismic-resistant system in Iranian concrete buildings, needs 35 to 60 kg per m²; an intermediate moment frame, 40 to 55 kg; a special moment frame, 45 to 70 kg. The roof rebar weight, independent of that choice, depends on the roof type (joist and block, solid concrete slab, or composite — see the FAQ below). The concrete volume required is also roughly 0.35 to 0.5 m³ per m² of floor area.
The main frame steel weight (columns, beams, bracing and connections together) depends on the lateral load system: a concentrically braced frame, 45 to 70 kg per m²; an eccentrically braced frame, 50 to 75 kg; an intermediate moment frame, 65 to 105 kg; a special moment frame, 70 to 115 kg; a dual system, up to 120 kg. The roof rebar weight follows the same logic as a concrete roof, except that a composite roof (on a steel deck) is the most common choice in steel frames — 8 to 12 kg per m², not counting the weight of the steel deck sheet itself, which is calculated separately.
A shed is usually single-story, so its inputs are the span and hall length, not a number of floors. The main frame weight (girder or truss), based on a shed weight estimation table for a 100 kg/m² snow load (Tehran standard), ranges from about 25 kg/m² for small spans up to about 50 kg/m² for large spans. Areas with heavier snow load need substantially more frame weight, up to about 200 kg/m².
Because these two quantities depend on two different design decisions. The frame weight (columns and beams) depends on the lateral load system — for example, in a concrete building, an ordinary moment frame is lighter than a special seismic-resistant moment frame. The roof rebar weight, independent of that choice, depends on the roof system: joist and block, solid concrete slab, or composite roof. A single combined figure would hide these two independent decisions and would be misleading for a real project.
As a rule of thumb: a joist-and-block roof (the most common and economical roof system in Iranian residential buildings) needs about 5 to 7 kg of rebar per m²; a composite roof (common in steel frames) needs about 8 to 12 kg per m²; and a solid concrete slab, the heaviest option, needs about 10 to 16 kg per m².
The lateral load system. A concentrically braced frame (the most common and economical system) typically needs 45 to 70 kg of steel per m²; an eccentrically braced frame, 50 to 75 kg; an intermediate moment frame, 65 to 105 kg; a special moment frame, 70 to 115 kg; and a dual system (bracing combined with a moment frame, for high-rise structures or high-seismic-risk areas), up to 120 kg per m². This figure includes the columns, beams, bracing, and connections together, not just the main I-beams.
Because the actual purlin weight depends on purlin spacing, and the sheeting weight depends on the roof/wall design — two parameters that aren't known without a construction drawing. Without those two inputs, no reliable rule-of-thumb coefficient exists for purlin or sheeting weight; a figure shown without that information would be false precision, not a real estimate. This tool only calculates the weight of the shed's main frame (girder or truss), based on span and length.
No. This is a preliminary rule-of-thumb estimate based on coefficients common in the Iranian construction industry, meant for a quick estimate of the quantity and approximate cost of steel before consulting a structural engineer. None of this tool's figures (including the foundation, which depends entirely on soil conditions and is not calculated here) replace formal structural drawings and calculations.
For each line (frame rebar, roof rebar, shed frame), the user selects one specific product from Ahantime's live catalog, with an exact grade, size, and factory; the cost equals that line's calculated weight multiplied by that specific selected product's current price, not the average of an entire product category.
Specify the lateral load system, roof type, and project area to see separate estimates for the frame and the roof.
Enter the lateral system, roof type, floor area, and number of floors to see the material and cost estimate.
Preliminary estimate
These figures are calculated from civil-engineering references: frame rebar by lateral system (Moment frame + shear wall 35 to 60, Intermediate moment frame 40 to 55, Special moment frame (high seismic resistance) 45 to 70 kg/m²), roof rebar by roof type (Joist and block 5 to 7, Solid concrete slab 10 to 16 kg/m²), and concrete 0.35 to 0.5 m³ per m². The foundation depends on soil conditions and is not calculated here. This calculation does not replace engineering calculations. For an exact figure, chat with the AI advisor.
