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Concrete for a 30 × 40 slab
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14.81 yd³
30 × 40 ft (1200 ft²) at 4 in thick, before waste
Concrete for a 30 × 40 slab by thickness
| Thickness | yd³ | yd³ +10% | 80 lb bags | 60 lb bags | Ready-mix @ $165/yd³ |
|---|---|---|---|---|---|
| 4 in | 14.81 | 16.30 | 734 | 978 | $2,689 |
| 5 in | 18.52 | 20.37 | 917 | 1223 | $3,361 |
| 6 in | 22.22 | 24.44 | 1100 | 1467 | $4,033 |
| 8 in | 29.63 | 32.59 | 1467 | 1956 | $5,378 |
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 30x40 slab?
A 30 × 40 ft slab 4 in thick is 14.81 cubic yards; order about 16.30 yd³ with 10% extra. At 6 in thick it is 22.22 yd³.
How many bags of concrete for a 30x40 slab?
About 734 bags of 80 lb concrete (or 978 × 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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