You can not compare them.
square feet is a measurement of area
cubic feet is a measurement of volume.
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9 square feet per yard x 3 =27 or 27 cubic feet per cubic yard
9' x 9' = 81 square feet.
300 square feet x 1/2 foot = 150 cubic feet1 cubic yard = 27 cubic feet150 cubic feet = (150 / 27) = 5 - 5/9 = 5.555cubic yards (rounded, repeating)
840 square feet don't think the height of the ceilings helps unless you are looking for cubic feet which would be 7560 cubic feet
9*12 = 108 square feet.