Rebar Spacing and Quantity

Formula and source

Bars per direction = floor((dimension - 2 × cover) / spacing) + 1; total length = bars × dimension + lap-splice allowance per ACI 318 §25.5.

ACI 318-19 (Building Code Requirements for Structural Concrete) by name. IBC 2021 (International Building Code). §1905 references ACI 318.

Audience

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Posture

Rough Logic answers the math question the working professional asks on the job. The site is a calm, fast, ad-free, account-free, ever-free reference. It does not interpret code. It does not replace the licensed professional. It does not store your inputs. The Authority Having Jurisdiction governs all installations and inspections.