Estimate how many tiles you need based on room and tile dimensions.
Tiles needed = (room area × (1 + waste %)) / tile area; boxes = tiles needed / tiles per box.
A 120 sq ft floor with 1 sq ft tiles and 10% waste needs about 132 tiles.
Extra tiles cover cuts, breakage, and future repairs; 10–15% is standard, more for diagonal layouts.
Enter the tile dimensions in inches or centimeters; the calculator computes the tile area.
Grout lines slightly reduce the number of tiles needed; the waste allowance usually covers this.