Worker tying a rebar grid for a concrete slab, rebar spacing guide

Building Construction, Concrete Technology

Rebar Spacing for Slabs: Chart by Thickness + Free Calculator (2026)

Rebar spacing for concrete slabs: 12 to 18 in on center. Chart by slab thickness and bar size, ACI 318 minimum steel, worked example and a free calculator.

Nov 9, 20265 min read