This is a great question. So what most people don't realize about our interlocking flooring is that you will lose some of the actual square footage due to the tiles overlapping at the place where they interlock. Depending on the tile, this could be a small amount or a large amount. For our MMA Mats, you lose about a half-inch when these tiles interlock. So the amount of square footage that is covered by the tile when interlocked and the edging removed is approximately 8.78 square feet. Now, if you are trying to cover a whole room wall to wall, we recommend a little more flooring than is needed since you will need to cut the flooring to fit the space. Now, if you aren't looking to fill the whole room, you can always order less, but for most spaces, this would be more like a mat than a full room floor as there will be, in most instances, large gaps between the flooring surface and the walls.