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How Much Concrete for a 8×8 Slab?
0.79cubic yards
at 4 inches thick — order 0.87 yd³ with waste, or 36 × 80 lb bags
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| Thickness | Concrete needed | Order (with 10% waste) | 80 lb bags | 60 lb bags |
|---|---|---|---|---|
| 4 in | 0.79 yd³ | 0.87 yd³ | 36 | 48 |
| 5 in | 0.99 yd³ | 1.09 yd³ | 45 | 60 |
| 6 in | 1.19 yd³ | 1.3 yd³ | 54 | 72 |
The math: 8 ft × 8 ft × thickness in feet ÷ 27 = cubic yards. A 8×8 slab is 64 square feet.
At 4 inches this pour is 36 80 lb bags — small enough that bagged concrete is practical. Patios and walkways are fine at 4 inches; use 5–6 inches where vehicles will drive.
Other slab sizes
10×10 slab10×12 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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