Tile Calculator
Find how many tiles and boxes you need for a floor or wall from the room size, tile size and waste allowance. Example: a 10 by 12 foot room with 12 inch tiles needs 120 tiles, or 132 with 10% waste.
Show steps
How to use the Tile Calculator
- Enter the length and width of the floor or wall.
- Enter the tile width and length in inches.
- Choose a waste allowance and how many tiles come in a box.
- Press Calculate for tiles, boxes and cost.
Formula and method
Tiles = room area / tile area x (1 + waste). Tile area in square feet = width x length in inches / 144. Boxes = tiles / tiles per box, rounded up.
Worked example: 10 x 12 ft room, 12 inch tiles
| Step | Value |
|---|---|
| Room area | 120 sq ft |
| Tiles with no waste | 120 |
| Tiles with 10% waste | 132 |
| Boxes of 10 | 14 |
Tiles per 100 square feet
| Tile size | Tiles per 100 sq ft | With 10% waste |
|---|---|---|
| 4 x 4 in | 900 | 990 |
| 6 x 6 in | 400 | 440 |
| 8 x 8 in | 225 | 248 |
| 12 x 12 in | 100 | 110 |
| 12 x 24 in | 50 | 55 |
| 16 x 16 in | 57 | 62 |
| 24 x 24 in | 25 | 28 |
How much waste to allow
Cuts at edges, broken tiles and layout changes use extra tile. Order 10% for a simple grid and up to 20% for diagonal or herringbone layouts. Keep a few spare tiles from the same batch for future repairs, since colors can vary between production runs.
Frequently asked questions
How do I calculate how many tiles I need?
Divide the room area by the area of one tile, then add a waste allowance.
How much extra tile should I buy?
About 10% for straight layouts and 15% to 20% for diagonal layouts.
How many 12×12 tiles are in 100 square feet?
100 tiles, or 110 with 10% waste.
Does grout change the count?
Slightly. Wide grout joints reduce the tile count a little, but most guides ignore it.
How do I tile a wall?
Use the wall height and width as the length and width.
How many boxes of tile do I need?
Divide the total tiles by the tiles per box and round up.
Sources
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