Yards are for measuring length not volume.
Cubic yards required will be as follows:
1 cubic yard = 3 feet x 3 feet x 3 feet = 27 cubic feet
Your concrete pad is 30ft x 40ft x 0.3333ft (4 inches assumed) = 400 cubic feet
400 divided by 27 = 14.8148 cubic yards required
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If you multiply that out, you'll get cubic units. It doesn't make sense to convert that to yards.
1 cubic yard of concrete fills 27/depth in feet square feet.The number of cubic yards you need is(length of the pad in feet) x (width of the pad in feet) x (depth of the pad in inches)/324
That depends on how deep you pour it.The number of cubic yards you need is(length of the pad in feet) x (width of the pad in feet) x (depth of the pad in inches)/324For your 28' x 20' pad, that's [ (1.728) x (depth in inches) ] cubic yards.
is the 30 x 48 inches or feet? if inches then: 30/36 = 5/6; 48/36 = 4/3; and 6/36 = 1/6 V = (5/6)(4/3)(1/6) = 20/108 = 0.185 cubic yards
12 feet X 13 feet = 156 square feet 156 / 9 = 17.333 square yards