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How Much Concrete for a 12×12 Slab?
1.78cubic yards
at 4 inches thick — order 1.96 yd³ with waste, or 80 × 80 lb bags
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| Thickness | Concrete needed | Order (with 10% waste) | 80 lb bags | 60 lb bags |
|---|---|---|---|---|
| 4 in | 1.78 yd³ | 1.96 yd³ | 80 | 107 |
| 5 in | 2.22 yd³ | 2.44 yd³ | 100 | 134 |
| 6 in | 2.67 yd³ | 2.93 yd³ | 120 | 160 |
The math: 12 ft × 12 ft × thickness in feet ÷ 27 = cubic yards. A 12×12 slab is 144 square feet.
At 4 inches this pour is 80 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 slab10×20 slab12×16 slab16×16 slab20×20 slab12×24 slab24×24 slab20×30 slab30×30 slab24×36 slab
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