I need to know how many cubic yards of concrete is needed for a 4" thick driveway and 18' wide and 27' long. What formula do I need to use?

Thanks alot




Since you want the volume in cubic yards, (yards yards yards) you need all three dimensions in yards. There are 3 feet in a yard and 36 inches in a yard and hence

4 inches is 4/36 yards

18 feet is 18/3 yards and

27 feet is 27/3 yards

Thus the volume is

 4/36  18/3  27/3 = 6 cubic yards.