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How Much Concrete for a 12×24 Slab?
3.56cubic yards
at 4 inches thick — order 3.91 yd³ with waste, or 160 × 80 lb bags
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| Thickness | Concrete needed | Order (with 10% waste) | 80 lb bags | 60 lb bags |
|---|---|---|---|---|
| 4 in | 3.56 yd³ | 3.91 yd³ | 160 | 214 |
| 5 in | 4.44 yd³ | 4.89 yd³ | 200 | 267 |
| 6 in | 5.33 yd³ | 5.87 yd³ | 240 | 320 |
The math: 12 ft × 24 ft × thickness in feet ÷ 27 = cubic yards. A 12×24 slab is 288 square feet.
At 4 inches this pour is 160 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 slab24×24 slab20×30 slab30×30 slab24×36 slab
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