Bags or a truck?
At this size a ready-mix truck is the sensible choice. Mixing 67 bags by hand is a long, heavy day, and the first batches start to set before the last ones are placed.
Concrete slab charts · 10 × 12 ft
How much concrete for a 10×12 slab?
A 10 × 12 ft slab 4 inches thick needs 1.48 cubic yards of concrete (40.0 cubic feet), or about 67 bags of 80 lb premix. Add 5–10% for waste. Other thicknesses are in the table, or adjust the calculator below.
Units
10 × 12 ft slab by thickness
Exact volumes without waste. Bag counts are rounded up.
| Thickness | Cubic yards | Cubic feet | 80 lb bags | 60 lb bags | Metric |
|---|---|---|---|---|---|
| 3 in | 1.11 yd³ | 30.0 ft³ | 50 | 67 | 0.85 m³ |
| 4 in | 1.48 yd³ | 40.0 ft³ | 67 | 89 | 1.13 m³ |
| 5 in | 1.85 yd³ | 50.0 ft³ | 84 | 112 | 1.42 m³ |
| 6 in | 2.22 yd³ | 60.0 ft³ | 100 | 134 | 1.70 m³ |