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Concrete volume
Find cubic yards for a rectangular slab.
Your numbers
Volume with allowance
5.43 yd³
Net volume4.94 yd³
Slab area400 sq ft
Updates as you change the numbers. No account needed.
How this estimate works
Cubic yards = length × width × (thickness ÷ 12) ÷ 27. Multiply by (1 + allowance %) for an ordering estimate.
Rectangular slab only. Verify site dimensions and supplier order increments. Excludes footings and uneven subgrade.
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