Find how many boxes of tile your project needs. Each dimension has its own unit selector (in/ft/yd/m).
Tile is sold by the box. Measure each area, multiply length by width, and add them up - the unit selector converts inches, feet, yards or meters. Divide the total by the coverage printed on the box (use the preset for common sizes). Add 10% for straight layouts and 15% or more for diagonal patterns and rooms with many cuts.