Concrete for a 40x60 Slab
Order 32.59 yd with 10% waste — or 1334 × 80 lb bags / 1778 × 60 lb bags.
By thickness
| Thickness | Cubic yards | +10% waste | 80 lb bags | Typical use |
|---|---|---|---|---|
| 4" | 29.63 | 32.59 | 1334 | Patio, shed pad, walkway |
| 5" | 37.04 | 40.74 | 1667 | Light vehicle traffic |
| 6" | 44.44 | 48.89 | 2000 | Driveway, garage |
Bags or the truck?
For this 2400 sq ft slab at 4": bags ≈ $8,671 (1334 × 80 lb — that's 106,720 lb of mixing) vs ready-mix ≈ $4,593 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 40x60 slab?
A 40x60 slab at the standard 4-inch thickness needs 29.63 cubic yards of concrete — order 32.59 yards with a 10% waste margin. At 6 inches it needs 44.44 yards.
How many bags of concrete for a 40x60 slab?
At 4 inches thick: 1334 bags of 80 lb concrete mix or 1778 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 40x60 slab?
Ready-mix. Bags for this slab would cost about $8,671 in material and require mixing 106,720 lb by hand; a delivered order runs roughly $4,593 and arrives ready to pour.