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Concrete for a 30 × 50 slab
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18.52 yd³
30 × 50 ft (1500 ft²) at 4 in thick, before waste
Concrete for a 30 × 50 slab by thickness
| Thickness | yd³ | yd³ +10% | 80 lb bags | 60 lb bags | Ready-mix @ $165/yd³ |
|---|---|---|---|---|---|
| 4 in | 18.52 | 20.37 | 917 | 1223 | $3,361 |
| 5 in | 23.15 | 25.46 | 1146 | 1528 | $4,201 |
| 6 in | 27.78 | 30.56 | 1376 | 1834 | $5,042 |
| 8 in | 37.04 | 40.74 | 1834 | 2445 | $6,722 |
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 30x50 slab?
A 30 × 50 ft slab 4 in thick is 18.52 cubic yards; order about 20.37 yd³ with 10% extra. At 6 in thick it is 27.78 yd³.
How many bags of concrete for a 30x50 slab?
About 917 bags of 80 lb concrete (or 1223 × 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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