To calculate how many floor tiles that you need, measure the floor or the wall area that is to be tiled and for each flat surface, measure the length and the width in centimetres and then multiply to get the square footage. Next, determine the area of every tile and then calculate how many tiles that you will need to cover the whole location. You should then buy ten percent more tiles than the actual number that you need.
1 Additional Answer
An easy way is to calculate how many floor tiles are needed is to measure the length and width of the floor and divide it by the length and width of a single tile, respectively. Multiply the two figures to get an estimate of the number of tiles needed to cover the floor.