Concrete for a 12x14 Slab
Order 2.28 yd with 10% waste — or 94 × 80 lb bags / 125 × 60 lb bags.
By thickness
| Thickness | Cubic yards | +10% waste | 80 lb bags | Typical use |
|---|---|---|---|---|
| 4" | 2.07 | 2.28 | 94 | Patio, shed pad, walkway |
| 5" | 2.59 | 2.85 | 117 | Light vehicle traffic |
| 6" | 3.11 | 3.42 | 140 | Driveway, garage |
Bags or the truck?
For this 168 sq ft slab at 4": bags ≈ $611 (94 × 80 lb — that's 7,520 lb of mixing) vs ready-mix ≈ $396 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 12x14 slab?
A 12x14 slab at the standard 4-inch thickness needs 2.07 cubic yards of concrete — order 2.28 yards with a 10% waste margin. At 6 inches it needs 3.11 yards.
How many bags of concrete for a 12x14 slab?
At 4 inches thick: 94 bags of 80 lb concrete mix or 125 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 12x14 slab?
Ready-mix. Bags for this slab would cost about $611 in material and require mixing 7,520 lb by hand; a delivered order runs roughly $396 and arrives ready to pour.