How Many Bags of Concrete for a 10×10 Slab?
A 10×10 ft slab at the standard 4-inch thickness needs 62 bags of 80 lb concrete mix, or 82 bags of 60 lb mix, when you include a 10% waste factor.
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The answer at a glance (10×10 slab, all thicknesses)
| Thickness | Volume (cu ft) | 80 lb bags | 60 lb bags | 40 lb bags |
|---|---|---|---|---|
| 3 inches | 25.0 → 27.5* | 46 | 62 | 92 |
| 4 inches | 33.3 → 36.7* | 62 | 82 | 123 |
| 5 inches | 41.7 → 45.8* | 77 | 102 | 153 |
| 6 inches | 50.0 → 55.0* | 92 | 123 | 184 |
Includes 10% waste factor. All bag counts rounded up.
How we calculated it
For a 10×10 slab at 4 inches:
- Area = 10 × 10 = 100 sq ft
- Volume = 100 × (4 ÷ 12) = 33.33 cu ft
- With 10% waste = 33.33 × 1.10 = 36.67 cu ft
- 80 lb bags = 36.67 ÷ 0.60 = 61.1 → 62 bags
- 60 lb bags = 36.67 ÷ 0.45 = 81.5 → 82 bags
Bag yields per Quikrete specifications: 80 lb = 0.60 cu ft, 60 lb = 0.45 cu ft, 40 lb = 0.30 cu ft.
How many cubic yards for a 10×10 slab?
| Thickness | Cubic yards |
|---|---|
| 3 inches | 0.93 cu yd |
| 4 inches | 1.23 cu yd |
| 5 inches | 1.54 cu yd |
| 6 inches | 1.85 cu yd |
Tips for pouring a concrete slab
- Rent a concrete mixer if using more than 30–40 bags — mixing by hand or in a wheelbarrow that many bags is exhausting.
- Order extra — the 10% waste factor covers spillage and uneven ground, but buy 2–3 extra bags just in case.
- Check local codes — some jurisdictions require inspections or specific thickness for slabs near structures.
Use the Concrete Calculator to get the exact bag count for any custom slab size and thickness.
Frequently Asked Questions
How many 80 lb bags of concrete for a 10x10 slab at 4 inches?
A 10×10 ft slab at 4 inches thick needs 62 bags of 80 lb concrete mix (including 10% waste). The slab volume is 33.3 cubic feet; with waste, 36.7 cu ft ÷ 0.60 cu ft/bag = 62 bags.
How many 60 lb bags of concrete for a 10x10 slab?
You need 82 bags of 60 lb concrete mix for a standard 10×10 slab at 4 inches thick with 10% waste (36.7 cu ft ÷ 0.45 cu ft/bag = 82 bags).
How many bags of concrete for a 10x10 slab at 6 inches?
At 6 inches thick, a 10×10 slab needs 50 cubic feet of concrete. With 10% waste, that is 55 cu ft. You would need 92 bags of 80 lb mix (55 ÷ 0.60) or 123 bags of 60 lb mix (55 ÷ 0.45).
Should I use ready-mix or bags for a 10x10 slab?
A 10×10 slab at 4 inches requires about 1.23 cubic yards. At that volume, bagged concrete is manageable but labor-intensive (62 bags of 80 lb mix). Ready-mix delivery is usually more economical for slabs over 1 cubic yard if a truck can access your site.
What thickness should a 10x10 concrete slab be?
For a standard residential patio or walkway, 4 inches is the minimum. For a shed floor or area with occasional light vehicle traffic, use 5–6 inches. Structural applications require an engineer's specification.