Concrete for a 24x24 Slab
Order 7.82 yd with 10% waste — or 320 × 80 lb bags / 427 × 60 lb bags.
By thickness
| Thickness | Cubic yards | +10% waste | 80 lb bags | Typical use |
|---|---|---|---|---|
| 4" | 7.11 | 7.82 | 320 | Patio, shed pad, walkway |
| 5" | 8.89 | 9.78 | 400 | Light vehicle traffic |
| 6" | 10.67 | 11.73 | 480 | Driveway, garage |
Bags or the truck?
For this 576 sq ft slab at 4": bags ≈ $2,080 (320 × 80 lb — that's 25,600 lb of mixing) vs ready-mix ≈ $1,102 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 24x24 slab?
A 24x24 slab at the standard 4-inch thickness needs 7.11 cubic yards of concrete — order 7.82 yards with a 10% waste margin. At 6 inches it needs 10.67 yards.
How many bags of concrete for a 24x24 slab?
At 4 inches thick: 320 bags of 80 lb concrete mix or 427 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 24x24 slab?
Ready-mix. Bags for this slab would cost about $2,080 in material and require mixing 25,600 lb by hand; a delivered order runs roughly $1,102 and arrives ready to pour.