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Concrete for a 30 × 30 slab
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11.11 yd³
30 × 30 ft (900 ft²) at 4 in thick, before waste
Concrete for a 30 × 30 slab by thickness
| Thickness | yd³ | yd³ +10% | 80 lb bags | 60 lb bags | Ready-mix @ $165/yd³ |
|---|---|---|---|---|---|
| 4 in | 11.11 | 12.22 | 550 | 734 | $2,017 |
| 5 in | 13.89 | 15.28 | 688 | 917 | $2,521 |
| 6 in | 16.67 | 18.33 | 826 | 1101 | $3,025 |
| 8 in | 22.22 | 24.44 | 1100 | 1467 | $4,033 |
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 30x30 slab?
A 30 × 30 ft slab 4 in thick is 11.11 cubic yards; order about 12.22 yd³ with 10% extra. At 6 in thick it is 16.67 yd³.
How many bags of concrete for a 30x30 slab?
About 550 bags of 80 lb concrete (or 734 × 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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