40x60 concrete slab
For a 40 by 60 foot slab at 4 inches thick, you need about 1,467 bags of 80 lb concrete mix, costing about $8,772.66.
Concrete slab
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Bags needed
1,46780 lb bags
= 1,956 x 60 lb bags
About $8,772.66 in 80 lb bags
= 29.63 cu yd ready-mix
Avg US retail price, checked Aug 2026.
If you are pouring a driveway, consider 6 inches thick. At that thickness, you will need about 2,200 bags of 80 lb mix.
This slab needs about 29.63 cubic yards, and you order ready mix concrete in cubic yards.
Bag prices are a US average, last checked Aug 2026.