The difference is in the composition and durability of the tile. Although ceramic and porcelain tile are both made from clay and other minerals, the clay used to make porcelain tile is more refined and fired at much higher temperatures than ceramic tile. As a result, porcelain tile is extremely dense and less porous so it’s more resistant to moisture, stains, and water absorption. Although ceramic tiles are less expensive and highly recommended for interior floors and walls, porcelain tiles are more desirable due to its durability and resistance to chipping and scratching, especially for areas that endure heavy traffic.
Of course, you will need to know the area of the space. But you should also plan to start with more than the exact number of tiles that will fill the area, due to breaks and cutouts. Generally, adding 5 to 7% in surplus to account for cut loss is sufficient if the environment is simple (square or rectangular with few cutouts). If the plan is diagonal or if the environment has a distinctive or organic shape, then many pieces will have to be cut at the corners. In these scenarios, it is important to provide a surplus of up to 15% to avoid material deficit during installation.