It should be a little over 19 yards.
About 162sf.
2.15
14.81 yds
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39.1116 cubic yards
It is all dependant on how thick the concrete is. You take the square footage and turn that into cubed feet (where the thickness comes in) if its 1" thick you multiply the square footage by.083, if its 2" thick you multiply by.17. To come up with this number you take the thickness say 3" and divide that by 12 (12 inches in a foot), so for 3 inches you get .25. So back to the question at hand, say your 30 square feet of concrete is 6 inches thick, your equation would look like this: 30 X .5 = 15. So 15 is your cubed footage. You then multiply this number by 150 which is the weight in pounds of 1 cubic foot of concrete. The number you come up with is 2,250. That is the amount in pounds of your 30 square feet of concrete assuming it is 6 inches thick.
A cubic yard is 46,656 cubic inches. Spread to a thicknes of 5 inches, a cubic yard of concrete covers 9332.1 square inches, which is 64.8 square feet.
About 162sf.
81
2.15
14.81 yds
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1000 square feet/9 = 111.1 square yards of concrete 6 inches thick. This is the same as 111.1/4.5 = 24.7 cubic yards of concrete.
How many square yards in a 20x18 feet 3 inches thick
Linear footage is a one dimensional measurment. Board footage is volume. one board foot is 1 inch thick by 12 inches square. 1" x 12" x 12" = 144 cubic inches of wood or one board foot.
6
39.1116 cubic yards