Rebar Calculator
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Formula
Bars Each Direction = (Perpendicular Dimension ÷ Spacing) + 1. Linear Feet = Sum of (Bars × Bar Length) for each direction.
Frequently Asked Questions
What spacing should I use for rebar?
12 inches on center is common for driveways and structural slabs. 18 inches on center works for patios and walkways.
What size rebar for a residential slab?
Number 4 rebar (1/2-inch diameter) is most common for residential concrete slabs and footings.