How Many Bags of Concrete for a 4x4 Slab?
A 4x4 slab at 4" needs 10 bags of 80 lb concrete.
10bags
80 lb bags · estimated $69.80 at $6.98/bag
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Estimated cost: ~$69.80 (10 × $6.98/bag, Spring 2026 pricing)
Quick presets
Bag size
Material list
- 10 × 80 lb concrete mix bags — $69.80 @ $6.98/bag (Spring 2026)Home Depot ↗Lowe's ↗
- Wheelbarrow or mixing tub
- Mixing hoe or drill paddle
- Margin trowel or float
Multi-bag comparison
| Bag size | Bags | Price/bag | Total |
|---|---|---|---|
| 80 lbBest value | 10 | $6.98 | $69.80 |
| 60 lb | 14 | $5.98 | $83.72 |
| 40 lb | 20 | $4.98 | $99.60 |
Prices are spring 2026 estimates. Above ~60 bags, price a ready-mix truck too — it is often cheaper.
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10 bags(80 lb)
$69.80
How this is calculated
We convert your dimensions to cubic feet, add a 10% waste buffer for spillage and an uneven subgrade, then divide by the bag's yield and round up to the next full bag.
FAQ
How many bags of concrete for a 4x4 slab?
A 4x4 slab at 4 inches needs about 10 bags of 80 lb or 14 bags of 60 lb concrete, including a 10% waste allowance.
How much does a 4x4 concrete slab cost?
About $70 in 80 lb bags at current prices.
How many cubic feet of concrete is a 4x4 slab at 4 inches?
About 5.3 cubic feet, or 5.9 cubic feet once the 10% waste buffer is added.
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