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Concrete for a 18 × 20 slab
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4.44 yd³
18 × 20 ft (360 ft²) at 4 in thick, before waste
Concrete for a 18 × 20 slab by thickness
| Thickness | yd³ | yd³ +10% | 80 lb bags | 60 lb bags | Ready-mix @ $165/yd³ |
|---|---|---|---|---|---|
| 4 in | 4.44 | 4.89 | 220 | 294 | $807 |
| 5 in | 5.56 | 6.11 | 275 | 367 | $1,008 |
| 6 in | 6.67 | 7.33 | 331 | 441 | $1,210 |
| 8 in | 8.89 | 9.78 | 440 | 587 | $1,613 |
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 18x20 slab?
A 18 × 20 ft slab 4 in thick is 4.44 cubic yards; order about 4.89 yd³ with 10% extra. At 6 in thick it is 6.67 yd³.
How many bags of concrete for a 18x20 slab?
About 220 bags of 80 lb concrete (or 294 × 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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