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.