Home › How Much Concrete for a 24×36 Slab?
How Much Concrete for a 24×36 Slab?
10.7cubic yards
at 4 inches thick — order 11.7 yd³ with waste, or 480 × 80 lb bags
Advertisement
| Thickness | Concrete needed | Order (with 10% waste) | 80 lb bags | 60 lb bags |
|---|---|---|---|---|
| 4 in | 10.7 yd³ | 11.7 yd³ | 480 | 640 |
| 5 in | 13.3 yd³ | 14.7 yd³ | 600 | 800 |
| 6 in | 16 yd³ | 17.6 yd³ | 720 | 960 |
The math: 24 ft × 36 ft × thickness in feet ÷ 27 = cubic yards. A 24×36 slab is 864 square feet.
At 4 inches this pour is 480 80 lb bags — at that quantity, ready-mix delivery is almost always cheaper and far easier than bagged concrete. Patios and walkways are fine at 4 inches; use 5–6 inches where vehicles will drive.
Other slab sizes
8×8 slab10×10 slab10×12 slab12×12 slab10×20 slab12×16 slab16×16 slab20×20 slab12×24 slab24×24 slab20×30 slab30×30 slab
Advertisement