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Concrete for a 20 × 24 slab
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5.93 yd³
20 × 24 ft (480 ft²) at 4 in thick, before waste
Concrete for a 20 × 24 slab by thickness
| Thickness | yd³ | yd³ +10% | 80 lb bags | 60 lb bags | Ready-mix @ $165/yd³ |
|---|---|---|---|---|---|
| 4 in | 5.93 | 6.52 | 294 | 392 | $1,076 |
| 5 in | 7.41 | 8.15 | 367 | 489 | $1,344 |
| 6 in | 8.89 | 9.78 | 440 | 587 | $1,613 |
| 8 in | 11.85 | 13.04 | 587 | 783 | $2,151 |
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 20x24 slab?
A 20 × 24 ft slab 4 in thick is 5.93 cubic yards; order about 6.52 yd³ with 10% extra. At 6 in thick it is 8.89 yd³.
How many bags of concrete for a 20x24 slab?
About 294 bags of 80 lb concrete (or 392 × 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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