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Concrete for a 40 × 40 slab
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19.75 yd³
40 × 40 ft (1600 ft²) at 4 in thick, before waste
Concrete for a 40 × 40 slab by thickness
| Thickness | yd³ | yd³ +10% | 80 lb bags | 60 lb bags | Ready-mix @ $165/yd³ |
|---|---|---|---|---|---|
| 4 in | 19.75 | 21.73 | 978 | 1304 | $3,585 |
| 5 in | 24.69 | 27.16 | 1223 | 1630 | $4,481 |
| 6 in | 29.63 | 32.59 | 1467 | 1956 | $5,378 |
| 8 in | 39.51 | 43.46 | 1956 | 2608 | $7,170 |
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 40x40 slab?
A 40 × 40 ft slab 4 in thick is 19.75 cubic yards; order about 21.73 yd³ with 10% extra. At 6 in thick it is 29.63 yd³.
How many bags of concrete for a 40x40 slab?
About 978 bags of 80 lb concrete (or 1304 × 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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