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Concrete for a 10 × 20 slab
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2.47 yd³
10 × 20 ft (200 ft²) at 4 in thick, before waste
Concrete for a 10 × 20 slab by thickness
| Thickness | yd³ | yd³ +10% | 80 lb bags | 60 lb bags | Ready-mix @ $165/yd³ |
|---|---|---|---|---|---|
| 4 in | 2.47 | 2.72 | 123 | 163 | $448 |
| 5 in | 3.09 | 3.40 | 153 | 204 | $560 |
| 6 in | 3.70 | 4.07 | 184 | 245 | $672 |
| 8 in | 4.94 | 5.43 | 245 | 326 | $896 |
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 10x20 slab?
A 10 × 20 ft slab 4 in thick is 2.47 cubic yards; order about 2.72 yd³ with 10% extra. At 6 in thick it is 3.70 yd³.
How many bags of concrete for a 10x20 slab?
About 123 bags of 80 lb concrete (or 163 × 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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