Concrete for a 12x16 Slab
Order 2.61 yd with 10% waste — or 107 × 80 lb bags / 143 × 60 lb bags.
By thickness
| Thickness | Cubic yards | +10% waste | 80 lb bags | Typical use |
|---|---|---|---|---|
| 4" | 2.37 | 2.61 | 107 | Patio, shed pad, walkway |
| 5" | 2.96 | 3.26 | 134 | Light vehicle traffic |
| 6" | 3.56 | 3.91 | 160 | Driveway, garage |
Bags or the truck?
For this 192 sq ft slab at 4": bags ≈ $696 (107 × 80 lb — that's 8,560 lb of mixing) vs ready-mix ≈ $442 delivered. The truck wins here. Prices are national ballparks — your local quote rules.
Adjust the numbers
Common questions
How much concrete do I need for a 12x16 slab?
A 12x16 slab at the standard 4-inch thickness needs 2.37 cubic yards of concrete — order 2.61 yards with a 10% waste margin. At 6 inches it needs 3.56 yards.
How many bags of concrete for a 12x16 slab?
At 4 inches thick: 107 bags of 80 lb concrete mix or 143 bags of 60 lb. At this volume, delivered ready-mix is usually cheaper and far less work than mixing bags.
Should I use bags or ready-mix for a 12x16 slab?
Ready-mix. Bags for this slab would cost about $696 in material and require mixing 8,560 lb by hand; a delivered order runs roughly $442 and arrives ready to pour.