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How Much Concrete for a 24×24 Slab?
7.11cubic yards
at 4 inches thick — order 7.82 yd³ with waste, or 320 × 80 lb bags
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| Thickness | Concrete needed | Order (with 10% waste) | 80 lb bags | 60 lb bags |
|---|---|---|---|---|
| 4 in | 7.11 yd³ | 7.82 yd³ | 320 | 427 |
| 5 in | 8.89 yd³ | 9.78 yd³ | 400 | 534 |
| 6 in | 10.7 yd³ | 11.7 yd³ | 480 | 640 |
The math: 24 ft × 24 ft × thickness in feet ÷ 27 = cubic yards. A 24×24 slab is 576 square feet.
At 4 inches this pour is 320 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 slab20×30 slab30×30 slab24×36 slab
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