Bags or a truck?
At this size a ready-mix truck is the sensible choice. Mixing 143 bags by hand is a long, heavy day, and the first batches start to set before the last ones are placed.
Concrete slab charts · 16 × 16 ft
How much concrete for a 16×16 slab?
A 16 × 16 ft slab 4 inches thick needs 3.16 cubic yards of concrete (85.3 cubic feet), or about 143 bags of 80 lb premix. Add 5–10% for waste. Other thicknesses are in the table, or adjust the calculator below.
Units
16 × 16 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 | 2.37 yd³ | 64.0 ft³ | 107 | 143 | 1.81 m³ |
| 4 in | 3.16 yd³ | 85.3 ft³ | 143 | 190 | 2.42 m³ |
| 5 in | 3.95 yd³ | 106.7 ft³ | 178 | 238 | 3.02 m³ |
| 6 in | 4.74 yd³ | 128.0 ft³ | 214 | 285 | 3.62 m³ |