37 yards of concrete is needed for a 3000 square feet 4 inches thick.
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.
40.1 cubic yards
Convert the measurement in square feet to square yards and the thickness in inches to yards. 3 feet = 1 yard 9 square feet = 1 square yard. : 1100 square feet = 1100/9 = 122.2222 sq yards 36 inches = 1 yard 5 inches = 5/36 = 0.13888 yards. The amount of concrete required = 122.2222 x 0.13888 = 16.975 cubic yards In practice, an order would be sent for 17 cubic yards of concrete.
39.1116 cubic yards
One square yard is nine square feet, so 27 square feet is equivalent to 3 square yards. So 3 yards of concrete will cover 27 square feet.
If you multiply inches times inches, you get square inches. You can convert that to square yards, but not to yards.
For 576 square feet at a depth of 4 inches, you will need 7.11 cubic yards.
At a poured depth of 4 inches, you will need 4.94 cubic yards.
To convert square inches to square yards, divide square inches by 1,296.
It should be a little over 19 yards.
2.2222222201902215 cubic yards