Garage floor — 24×24 ft · #4 @ 12 in OC · 2 in cover
Typical slab reinforcement grid starting points.
| Application | Thickness | Bar Size | Spacing |
|---|---|---|---|
| Garage floor | 5–6 in | #4 – #5 | 12 in OC |
| Driveway | 5–6 in | #4 | 12–16 in OC |
| Patio | 4 in | #3 – #4 | 16–18 in OC |
| Industrial slab | 6–8 in | #5 – #6 | 12 in OC |
24×24 ft, #4 @ 12 in.
20×40 ft, #4 @ 12 in.
12×12 ft, #3 @ 18 in.
50×80 ft, #5 @ 12 in.
This rebar mesh calculator models a two-way concrete reinforcement grid. For bid-ready material lists with layers, use the rebar takeoff calculator. For spacing-only checks, see the rebar spacing calculator; for full takeoffs with concrete, use slab rebar calculator or concrete and rebar calculator.
With 2 inch cover, expect about 21 bars each direction—42 total bar runs before counting overlap and waste.
Wire mesh is factory-welded sheets. This tool estimates field-built bar grids with individual #3–#8 bars.
Enter total extra length for all laps in the project, or increase waste percent if you prefer a single factor.
How we built this calculator: results use the standard volume, area, and coverage formulas shown on this page, with typical U.S. material densities, bag yields, and waste factors that you can override. Written and checked by the YardsCalculator editorial team. Last reviewed: October 2026.
Last updated: May 22, 2026