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Volume = length × width × depth for rectangular slabs. Convert inches to feet before multiplying (1 in = 1/12 ft). Divide cubic feet by 27 for cubic yards. Add 5–10% waste factor for spillage and irregular forms. One cubic yard of ready-mix weighs ~4,000 lb. Standard residential slabs use 3,000–4,000 PSI mix; structural footings often require 4,000+ PSI.
Slab L×W×D in feet → cubic yards (÷27).
~1.47 yd³