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Concrete for a 14 × 20 slab
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3.46 yd³
14 × 20 ft (280 ft²) at 4 in thick, before waste
Concrete for a 14 × 20 slab by thickness
| Thickness | yd³ | yd³ +10% | 80 lb bags | 60 lb bags | Ready-mix @ $165/yd³ |
|---|---|---|---|---|---|
| 4 in | 3.46 | 3.80 | 172 | 229 | $627 |
| 5 in | 4.32 | 4.75 | 214 | 286 | $784 |
| 6 in | 5.19 | 5.70 | 257 | 343 | $941 |
| 8 in | 6.91 | 7.60 | 343 | 457 | $1,255 |
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 14x20 slab?
A 14 × 20 ft slab 4 in thick is 3.46 cubic yards; order about 3.80 yd³ with 10% extra. At 6 in thick it is 5.19 yd³.
How many bags of concrete for a 14x20 slab?
About 172 bags of 80 lb concrete (or 229 × 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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