Concrete for a 40×60 Slab at 4" Thick
A 40 ft × 60 ft slab poured 4 inches thick is 2,400 sq ft and needs 29.63 cubic yards of concrete — order 32.00 CY to cover 8% waste, or about 1440 80-lb bags for a small pour. Adjust the dimensions below for your project.
Concrete needed
29.63 cu yd
Slab area
2,400 sq ft
Concrete needed
29.63 cubic yards32.00 CY with 8% waste — order this much
80-lb bags
1,440 bagsor 1,920 × 60-lb bags
Ready-mix cost (est.)
$5,600~$175/CY delivered
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How this is calculated
Concrete volume = area × thickness. We convert to cubic yards (the unit ready-mix is sold in), then add 8% for spillage and over-ordering — the same waste factor used in professional estimating.