How much rebar do I need for a slab?

Lay a grid at your chosen spacing (often 18 inches), count bars each way, and multiply by length. Add length for overlaps at splices.

What size rebar for a residential slab?

#4 (half-inch) rebar on a 16–18 inch grid is common for driveways and patios. Check local code for your project.

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Linear feet of rebar for a slab grid.

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Slab length (ft)Slab width (ft)Grid spacing (in)

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How much rebar do I need for a slab?: Lay a grid at your chosen spacing (often 18 inches), count bars each way, and multiply by length. Add length for overlaps at splices.
What size rebar for a residential slab?: #4 (half-inch) rebar on a 16–18 inch grid is common for driveways and patios. Check local code for your project.