Use the following tool to estimate the total number of tiles you will need for your floor, roof, or any other surface coverage. For better accuracy, this calculator considers the gap or overlap between tiles.
Some of the tiles on the floor or wall have gaps. Most tiles for the roof or the wood siding for the wall overlap with each other to prevent leakage. For example, a 15 inches long tile for the roof will typically have 3 inches of overlap.