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Concrete for a 16 × 20 slab
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3.95 yd³
16 × 20 ft (320 ft²) at 4 in thick, before waste
Concrete for a 16 × 20 slab by thickness
| Thickness | yd³ | yd³ +10% | 80 lb bags | 60 lb bags | Ready-mix @ $165/yd³ |
|---|---|---|---|---|---|
| 4 in | 3.95 | 4.35 | 196 | 261 | $717 |
| 5 in | 4.94 | 5.43 | 245 | 326 | $896 |
| 6 in | 5.93 | 6.52 | 294 | 392 | $1,076 |
| 8 in | 7.90 | 8.69 | 392 | 522 | $1,434 |
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 16x20 slab?
A 16 × 20 ft slab 4 in thick is 3.95 cubic yards; order about 4.35 yd³ with 10% extra. At 6 in thick it is 5.93 yd³.
How many bags of concrete for a 16x20 slab?
About 196 bags of 80 lb concrete (or 261 × 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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