This floor tile calculator tells you how many tiles you need from your room size and tile size. Enter the dimensions above to get the tile count, the number of boxes, and a waste allowance for cuts and breakage.
How to use this calculator
- Enter the room length and width in feet.
- Enter one tile’s length and width in inches.
- Read the number of tiles needed, including waste.
How is the tile count calculated?
Room area (ft²) = Room Length × Room Width Tile area (ft²) = (Tile L ÷ 12) × (Tile W ÷ 12) Tiles needed = Room area ÷ Tile area × (1 + waste %)
- Waste % — 10% for straight layouts, up to 15% for diagonal or herringbone
Example calculation
For a 200 ft² room using 12″ × 12″ tiles (1 ft² each):
- Tiles = 200 ÷ 1 = 200
- Add 10% waste → buy 220 tiles
With larger 18″ × 18″ tiles (2.25 ft² each), the same room needs 200 ÷ 2.25 = 89 tiles, plus waste.
Choosing the right floor tile
- Bathroom & shower floors: smaller or textured tiles for slip resistance.
- Kitchens & hallways: porcelain for durability and easy cleaning.
- Renters & quick updates: peel-and-stick tiles install without mortar.
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Frequently Asked Questions
How many floor tiles do I need?
Divide the room area by the area of one tile, then add 10 percent for cuts. A 200 sq ft room with 12 x 12 inch tiles needs about 220 tiles.
How much extra tile should I buy for waste?
Add 10 percent for a standard straight layout and up to 15 percent for diagonal or herringbone patterns, which require more cutting.
What size floor tile is best for a small bathroom?
Larger tiles with fewer grout lines make a small bathroom feel bigger, but small mosaic tiles give more slip resistance on shower floors.