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How Much Concrete for a 10×12 Slab?
1.48cubic yards
at 4 inches thick — order 1.63 yd³ with waste, or 67 × 80 lb bags
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| Thickness | Concrete needed | Order (with 10% waste) | 80 lb bags | 60 lb bags |
|---|---|---|---|---|
| 4 in | 1.48 yd³ | 1.63 yd³ | 67 | 89 |
| 5 in | 1.85 yd³ | 2.04 yd³ | 84 | 112 |
| 6 in | 2.22 yd³ | 2.44 yd³ | 100 | 134 |
The math: 10 ft × 12 ft × thickness in feet ÷ 27 = cubic yards. A 10×12 slab is 120 square feet.
At 4 inches this pour is 67 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 slab12×12 slab10×20 slab12×16 slab16×16 slab20×20 slab12×24 slab24×24 slab20×30 slab30×30 slab24×36 slab
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