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First I find cubic feet.30x48 divided by 3 for 4 inches thick. 480 cubic feet27 cubic feet make a cubic yard.480 divided by 27=17.8I'd order 18 yards but also tell the ready mix company what I was doing so I wouldn't waste money.
96 square feet
About 1,400 square feet. (1,399.30835 square feet).
171 square feet.
10.764 square feet.