Concrete Bag Calculator
Exact bag counts and costs for slabs, footings, sonotubes, and post holes.
A 10x10 slab at 4" needs 62 bags
62bags
80 lb bags · estimated $432.76 at $6.98/bag
Quick presets
10 ft
10 ft
4 in
Bag size
Multi-bag comparison
| Bag size | Bags | Price/bag | Total |
|---|---|---|---|
| 80 lbBest value | 62 | $6.98 | $432.76 |
| 60 lb | 82 | $5.98 | $490.36 |
| 40 lb | 123 | $4.98 | $612.54 |
Prices are spring 2026 estimates. Above ~60 bags, price a ready-mix truck too — it is often cheaper.
Popular Slab Dimensions & Costs
Specialized Calculators by Job Type
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Concrete Driveway Bag Calculator
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