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
≈ 2 credit cards
ACI Code Compliant
1
Bars per Foot1.55
Steel Ratio0.61%
Effective Depth4.25 in
Max Allowed Spacing18 in
1
Identify Input Parameters
4 parameters
= Slab Thickness = 6in, Rebar Size = 4, Concrete Cover = 1.5in, Required Steel Area = 0.31in²/ft
= 4 input(s) provided
2
Calculate Bar Spacing
Bar Spacing
= 7.74
= 7.74
3
Calculate ACI Code Compliant
ACI Code Compliant
= 1
= 1
4
Calculate Bars per Foot
Bars per Foot
= 1.55
= 1.55
5
Calculate Steel Ratio
Steel Ratio
= 0.61
= 0.61