Rebar Calculator - Grid Spacing, Weight & Stick Quantity
Calculate rebar stick quantities (20 ft lengths), total linear feet, lap splice allowance, and steel weight for concrete slabs and footings.
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⚙️ Configuration & Inputs
ft
ft
📊 Results & Analysis
Rebar Sticks Needed (20 ft)
45 Sticks
Total Weight: ~598 lbs of Steel
| Total Linear Feet (Raw) | 820 lin ft |
| Linear Feet (with 10% Lap Splices) | 902 lin ft |
| 20-Foot Rebar Sticks | 45 Sticks |
| Total Steel Weight | 603 lbs |
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Rebar Grid Spacing & Lap Splices
Rebar reinforces concrete against tensile stress. Standard construction practices dictate a minimum 30-diameter overlap (lap splice) wherever two bars meet (roughly 15 to 18 inches for #4 rebar).
Frequently Asked Questions
#4 rebar (1/2-inch thickness) placed in an 18-inch on-center grid elevated on plastic rebar chairs is the gold standard for residential slabs.