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Concrete for a 12 × 24 slab
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3.56 yd³
12 × 24 ft (288 ft²) at 4 in thick, before waste
Concrete for a 12 × 24 slab by thickness
| Thickness | yd³ | yd³ +10% | 80 lb bags | 60 lb bags | Ready-mix @ $165/yd³ |
|---|---|---|---|---|---|
| 4 in | 3.56 | 3.91 | 177 | 235 | $645 |
| 5 in | 4.44 | 4.89 | 220 | 294 | $807 |
| 6 in | 5.33 | 5.87 | 264 | 352 | $968 |
| 8 in | 7.11 | 7.82 | 353 | 470 | $1,291 |
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 12x24 slab?
A 12 × 24 ft slab 4 in thick is 3.56 cubic yards; order about 3.91 yd³ with 10% extra. At 6 in thick it is 5.33 yd³.
How many bags of concrete for a 12x24 slab?
About 177 bags of 80 lb concrete (or 235 × 60 lb) at 4 in thick including 10% extra. For this size, ready-mix delivery is usually more practical than bags.
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