There can be no equivalence.
A cubic yard is a measure of volume in 3-dimensional space while a square foot is a measure of area in 2-dimensional space. The two measure different things and, according to basic principles of dimensional analysis, any attempt at conversion from one to the other is fundamentally flawed.
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For a 4-inch thick slab, you will need at least 9.48 Cubic Yards.
multiply the number of square yards - which is an area - by the average height in yards to get the volume in cubic yards
A yard of concrete is 27 cubic ft. Your measurements, if in feet, represents 480 cubic ft. Dividing this by 27 results in 17.78 yards.
8.25 cubic yards of concrete
7 feet by 14 feet = 98 square feet 98 square feet by 4 feet = 392 cubic feet There are 9 square feet in a square yard, and there are 29 cubic feet in a cubic yard.... so 392 cubic feet = 14.519 cubic yards