18 cubic yards refers to what in a concrete project?

• A. Concrete needed for slab
• B. Volume of soil to remove
• C. Height of the wall
• D. Weight of the concrete mix

Answer: (A)

In concrete work, cubic yards measure the volume of material to be poured. So when you see 18 cubic yards, it’s indicating the amount of concrete needed to fill a space for the slab, not soil to remove, not a height, and not the weight of the mix. The volume is found by multiplying the slab’s length, width, and thickness (with thickness converted to feet) and then converting cubic feet to cubic yards (divide by 27). For example, a slab area and thickness that require about 18 cubic yards would have a total fill volume equivalent to that space. This quantity helps you order the right amount of concrete to pour the slab, ensuring the space is fully filled to the intended depth.