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Hi Simone. I'm not all that conversant with American construction materials, so I'm assuming you mean blocks like those described here: http://www.westbrookblock.com/products/12inch.htm Such blocks are 8 in x 16 in and the depth can be 8 inches or 12 inches (or a few other options). I'm not sure how you are placing them either, so I will take a guess and say that it is the 8 x 16 side that is "exposed" and covering the area you gave me. This means that I am presuming that an 8 inch block and a 12 inch block cover the same area, but differ in terms of thickness only. If this is not your situation, you will simply have to provide more information to us. We are mathematicians after all, not construction experts. It's my understanding that concrete blocks are slightly smaller than advertised in order to allow for the mortar spacing, so I can just ignore the mortar area. Thus, each installed block covers 8 in x 16 in of surface. That's 128 square inches of surface. Now let's compare that to 30 182 sq feet. Each foot is 12 inches. So each square foot is 12 squared inches squared. That means 144 square inches per square foot. 30 182 x 144 equals 4 346 208 square inches. Now we simply divide this total area by the area each block covers: 4 346 208 / 128 = 33 955. That's just under thirty four thousand blocks. Cheers,  


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