Initially, in order to calculate the number of pieces, it is necessary to calculate the surface area in square meters. However, you have to consider any cuts that will be made so that they can fit inside corners and around any other specific areas of the room. It is generally recommended to add between 5% and 7% of material in simple areas (square or rectangular), and up to an additional 15% in the case of complicated or awkward areas (with several corners that create a lot of cutting waste).