Tile Calculator
Enter your room size and tile size to find out how many tiles to buy, including extra for cuts and breakage.
These are estimates. Real jobs vary with surface, product and waste, so round up and check your product's label before you buy.
How many tiles do I need for a room?
Divide the room's area by the area of one tile, then add about 10 percent for cuts and breakage. A 12×12 foot room is 144 square feet. Tile counts for common sizes at 10 percent waste:
| Tile size | Tiles for a 144 sq ft room (10% waste) |
|---|---|
| 12×12 in | 159 |
| 12×24 in | 80 |
| 18×18 in | 71 |
| 24×24 in | 40 |
How the tile calculator works
We convert the room area to square inches, divide by the tile's width × height, and multiply by one plus your waste allowance. Grout lines are ignored because their effect is small. Large tiles and diagonal layouts create more cut waste, so choose 15 percent for those.
Tile tips
Buy all your tile at once so the color and size match, and keep a few spares for future repairs. Check that the subfloor is flat and solid before you order, because uneven floors cause cracked tile and lost material.
Frequently asked questions
How much extra tile should I buy?
Ten percent is standard. Add 15 percent for diagonal layouts, large tiles or rooms with many corners.
Does the calculator include grout?
No. Grout lines are small and left out, so the tile count is a close estimate.
Can I use this for walls?
Yes. Enter the wall's width and height as the length and width.