Strip Foundation Rebar & Concrete Calculator

Strip foundations (or linear footings) are the most common foundation type for residential low-rise buildings. They support load-bearing walls by spreading the weight across a line of soil. Accurate estimation of materials is crucial here because these foundations often span the entire perimeter of a building, meaning small calculation errors accumulate into large material shortages or waste.

This tool separates the two critical components: the Concrete Volume (cubic meters) and the Reinforcement Tonnage. It calculates the longitudinal bars that resist bending moments and the transverse stirrups that hold the cage shape, applying standard bending deduction logic to give you a 'purchasing-ready' weight.

The calculator determines the concrete volume:

Stirrup cutting length (L_cut) accounts for the perimeter minus cover, plus hook allowances:

Where w_c and d_c are the core dimensions of the concrete after cover is subtracted.