This program (Tile calculator) calculates the quantity of tiles needed for the room. It allows you to estimate the required number of tiles (in square meters and in pieces) to face the floor or walls. A doorway (or part of it - depending on the height of the wall facing) is taken into account (subtracted) while calculating the tiles for walls. It also calculates first the estimated and then the exact total weight of the tiles (it helps you determine a load-carrying capacity of a vehicle needed to deliver the given number of tiles). The calculation is carried on in two stages. Preliminary calculation – the metric area, weight and number of tiles are determined based on the required area and the size of the tiles (20x30, 40x40, etc.) and extra tiles (in %) in case of breakage or cutting. Final calculation – precise metric area, number and weight calculation considering the metric area and the number of tiles in a single package (box). The peculiarity of tile area calculation used by manufacturers, factories and shops is taken into account during the final calculation. For instance: tile - 15x15, its area - 0.15x0, 15 = 0.225 m2. So believes the buyer. Store makes the calculation differently: one box of tiles contains 0.77 m2 and 34 pcs (according to the documents). So the area of ​​one tile is 0.77/34 = 0.2265 m2. It seems to be a difference of only 0.67%, but for 30 m2 (facing of a room of just 3x2 m, 2.5 m high), the difference will be 0.2 m2, which is already noticeable. A store thinks so because that's the way suppliers and manufacturers do the calculations. This application (Tile calculator) considers all of these nuances and saves your time on calculations. It won’t let you get lost in computations and will save your nerves which are tormented so much during any renovation.