Concrete Calculator › 20×20 slab
Concrete for a 20×20 Slab at 4 inches
A 20×20 slab (400 sq ft) at 4 inches needs about 4.94 cubic yards of concrete — roughly $741. See the full breakdown.
You need
4.94 cu yd
Estimated material cost $741
Area
400 sq ft
Volume
133.33 cu ft
80-lb bags
223
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Adjust for your project
You need
4.94 cu yd
Estimated material cost $741
Area
400 sq ft
Volume
133.33 cu ft
80-lb bags
223
Based on $150 per cuyd national average. Enter your local price for an exact quote. Estimate only.