How much concrete do you need for a 24x40 6 thick slab?

To calculate the amount of concrete needed for a 24x40 foot slab that is 6 inches thick, first convert the thickness to feet (6 inches = 0.5 feet). Then, multiply the length, width, and thickness: 24 ft x 40 ft x 0.5 ft = 480 cubic feet. Since concrete is typically measured in cubic yards, divide by 27 (the number of cubic feet in a cubic yard): 480 cubic feet ÷ 27 = approximately 17.78 cubic yards. Therefore, you will need about 18 cubic yards of concrete.