15X15X.33(4/12 there is 4 inches in a foot therefor 4" is .33 of a foot) equals 74.25 cf of concrete divide by 27 (three demensional object for yards) 2.75 Cubic Yards. if you try to order .75 cubic yards of concrete you will be laughed at, just order 3 cubic yards and make a entrance path. good luck.
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You will need 3.6 cubic yards.
You will need 27.6 cubic yards of cement.
8 square yards
40.1 cubic yards
3.95 cubic yards of cement are needed for a slab that size.