Rebar Spacing Calculator
Inputs
in
ACI 318: one-way slab minimum L/20 (simple) to L/28 (one end continuous); 4–8" typical
in
ACI 318 Table 20.6.1.3: slabs not exposed 1.5"; footings in soil 3"; exposed to weather 2"
in²/ft
Tab to move between fields
Results
Bar Spacing
7.74 in
ACI Code Compliant
1
Bars per Foot1.55
Steel Ratio0.61%
Effective Depth4.25 in
Max Allowed Spacing18 in