Calculate exactly how many tiles you need. Works for wall and floor tile projects. Includes waste allowance.
Tiles are tricky because you can't just divide area by tile size — you need to account for cuts, breakage, and pattern layout.
The formula: (Room Length × Room Width) ÷ (Tile Length × Tile Width) × (1 + waste%) = Total tiles needed.
Straight (grid): Most efficient, least waste. All tiles aligned in rows and columns.
Diagonal (45°): More elegant but 15% more tiles needed due to corner cuts.
Herringbone: Classic parquet look. Requires 20% extra tiles due to many small cuts.
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A 10×10 ft room (100 sq ft) needs approximately 110-115 sq ft of tile (including 10% waste). This equals about 280-300 12×12″ tiles. Use our calculator for exact estimates.
Measure the area (length × width), then add 10% waste for straight layouts or 15-20% for diagonal patterns. Our tile calculator automatically adds the correct waste margin.
12×12″ tiles are most popular (easy to install, fewer grout lines). Large-format tiles (18×18″ or 24×24″) make small rooms look bigger but require more skill to install. Avoid tiles larger than 1/3 of the room width.
Thinset: 50-75 sq ft per 50lb bag (depends on tile size and substrate). Grout: 100-200 sq ft per 25lb box (depends on tile size and grout line width). Buy a bit extra—grout colors are hard to match later.
Yes, but the existing tile must be clean, level, and well-bonded. Rough up the surface with sandpaper, use a primer, then apply new thinset. However, removing old tile gives better results and keeps floor height lower.