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Concrete for a 20 × 30 slab
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7.41 yd³
20 × 30 ft (600 ft²) at 4 in thick, before waste
Concrete for a 20 × 30 slab by thickness
| Thickness | yd³ | yd³ +10% | 80 lb bags | 60 lb bags | Ready-mix @ $165/yd³ |
|---|---|---|---|---|---|
| 4 in | 7.41 | 8.15 | 367 | 489 | $1,344 |
| 5 in | 9.26 | 10.19 | 459 | 612 | $1,681 |
| 6 in | 11.11 | 12.22 | 550 | 734 | $2,017 |
| 8 in | 14.81 | 16.30 | 734 | 978 | $2,689 |
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 20x30 slab?
A 20 × 30 ft slab 4 in thick is 7.41 cubic yards; order about 8.15 yd³ with 10% extra. At 6 in thick it is 11.11 yd³.
How many bags of concrete for a 20x30 slab?
About 367 bags of 80 lb concrete (or 489 × 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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