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Concrete for a 4 × 4 slab
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0.20 yd³
4 × 4 ft (16 ft²) at 4 in thick, before waste
Concrete for a 4 × 4 slab by thickness
| Thickness | yd³ | yd³ +10% | 80 lb bags | 60 lb bags | Ready-mix @ $165/yd³ |
|---|---|---|---|---|---|
| 4 in | 0.20 | 0.22 | 10 | 14 | $36 |
| 5 in | 0.25 | 0.27 | 13 | 17 | $45 |
| 6 in | 0.30 | 0.33 | 15 | 20 | $54 |
| 8 in | 0.40 | 0.43 | 20 | 27 | $72 |
Bags include 10% extra. Ready-mix prices vary by region; small loads often carry a short-load fee.
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FAQ
How much concrete do I need for a 4x4 slab?
A 4 × 4 ft slab 4 in thick is 0.20 cubic yards; order about 0.22 yd³ with 10% extra. At 6 in thick it is 0.30 yd³.
How many bags of concrete for a 4x4 slab?
About 10 bags of 80 lb concrete (or 14 × 60 lb) at 4 in thick including 10% extra.
Other slab sizes
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- 14 × 14 slab
- 12 × 24 slab
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- 18 × 20 slab
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- 20 × 30 slab
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- 30 × 50 slab
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- 40 × 60 slab
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