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Concrete for a 12 × 20 slab
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2.96 yd³
12 × 20 ft (240 ft²) at 4 in thick, before waste
Concrete for a 12 × 20 slab by thickness
| Thickness | yd³ | yd³ +10% | 80 lb bags | 60 lb bags | Ready-mix @ $165/yd³ |
|---|---|---|---|---|---|
| 4 in | 2.96 | 3.26 | 147 | 196 | $538 |
| 5 in | 3.70 | 4.07 | 184 | 245 | $672 |
| 6 in | 4.44 | 4.89 | 220 | 294 | $807 |
| 8 in | 5.93 | 6.52 | 294 | 392 | $1,076 |
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 12x20 slab?
A 12 × 20 ft slab 4 in thick is 2.96 cubic yards; order about 3.26 yd³ with 10% extra. At 6 in thick it is 4.44 yd³.
How many bags of concrete for a 12x20 slab?
About 147 bags of 80 lb concrete (or 196 × 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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