Rebar bid estimation — AI calculates weight for you

Reinforcement bid estimation is based on steel weight, and that weight must be taken off the structural drawings bar by bar: for each bar you record the size (for example #4, #5, #6), the count, the length and from that the weight (pounds per foot). A #4 bar weighs about 0.668 lb/ft, a #5 about 1.043 lb/ft and a #6 about 1.502 lb/ft, so identifying the bar size directly affects the total weight. A single footing can contain several bar sizes — longitudinal bars, stirrups and dowels — each calculated as its own line item.

The theoretical bar length shown on the drawing is not enough, because lap splices add to the quantity. The lap length depends on the bar size, the concrete strength and the bond conditions, and per ACI 318 it runs to many bar diameters. Long bars are cut and spliced, so every splice adds weight, and hooks and bends also consume more steel than a straight dimension. These must be accounted for before the weight is priced.

Reinforcement cost splits into material (per pound) and labor (per pound), and the labor share varies sharply with the complexity of the reinforcement. Welded wire mesh is fast to place and waste is low (3–5 %), whereas dense loose-bar reinforcement in columns and beams is slow and waste rises to 8–12 % from cutting and bending. Shop-cut and pre-bent (fabricated) bar reduces field waste and speeds placement but raises the material unit price — this trade-off is worth calculating per project.

Massoi calculates reinforcement weight from the structural drawings automatically: it identifies bar sizes, calculates counts, lengths and total weights, and breaks out mesh in square feet. With the weights ready per structure, the contractor can price material and labor separately and add a realistic splice and waste allowance — instead of counting hundreds of bars by hand.