How much concrete to do a 60x60x4 thick slab?

To calculate the amount of concrete needed for a slab measuring 60 inches by 60 inches with a thickness of 4 inches, first convert the dimensions to feet: 60 inches equals 5 feet, and 4 inches equals 0.33 feet. The volume of the slab is then calculated as length × width × thickness, which is 5 ft × 5 ft × 0.33 ft = 8.25 cubic feet. To convert this to cubic yards, divide by 27 (since there are 27 cubic feet in a cubic yard), resulting in approximately 0.31 cubic yards of concrete needed.