Tile Calculator
Enter the area, the tile size, the grout joint and how many tiles come in a box, and get the whole tiles and boxes to buy, with a waste allowance you can change, rounded up once.
Estimates for planning, not professional advice. Read the full notice.
Example: a tiled floor
6 12x24 tile, box
- Tiles to cover the area 39.38 tiles
- Tiles with the waste allowance 44 tiles
- Tiles left in the last box 4 tiles
Estimate for planning, from what you entered and the product data shown. Check product labels and your supplier before you buy.
Your project
Enter a size to see your total.
New rooms start at one more area with the same tile until you change them.
Each product is rounded up once for the whole project, so the total can be less than the items bought alone added together. A line counted from a cut layout (sheets, boards or tiles laid out piece by piece) is counted for each item and added.
Shopping list
| Item | Size | Buy |
|---|---|---|
| Tile, by the box | 12x24 tile, box | 6 |
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Worked example: a tiled floor
Show the working
- Area one tile takes, joint included 24.125 in × 12.125 in = 292.52 in²
- Tiles to cover the area 11,520 in² ÷ 292.52 in² = 39.38 tiles
- Add the waste allowance, once 39.38 tiles × 1.1 = 43.32 tiles
- Round up once, to whole tiles 43.32 tiles = 44 tiles
- Boxes: divide by the tiles in a box, round up once 44 tiles ÷ 8 = 6 × 12x24 tile, box
Assumptions
The figures behind the example. Sourced figures link to their source below; a default is a starting value to check against your label or supplier.
| Assumption | Value | Details and changes |
|---|---|---|
| Tile waste allowance | 10% | |
| Default A typical allowance, not a figure from a standard; check your label or supplier. Change it to the allowance you want. | ||
| Grout joint width | 0.125 in | |
| Default Your own grout joint; check the spacing on your tile label or supplier. | ||
| Tiles per box | 8 tiles | |
| Default Tiles per box is on your tile label or supplier's sheet; the list below offers common counts. | ||
Feet and inches, like 12' 6"
Boxes by waste allowance and tiles per box
Boxes for the example floor at five waste allowances and four box sizes, worked out on their own
| Waste allowance | Tiles | Boxes of 4 | Boxes of 6 | Boxes of 8 | Boxes of 10 |
|---|---|---|---|---|---|
| 0 percent | 40 | 10 | 7 | 5 | 4 |
| 5 percent | 42 | 11 | 7 | 6 | 5 |
| 10 percent | 44 | 11 | 8 | 6 | 5 |
| 15 percent | 46 | 12 | 8 | 6 | 5 |
| 20 percent | 48 | 12 | 8 | 6 | 5 |
Each row is the example floor's tile count with that allowance added once, then rounded up to whole boxes. Your own label gives the real tiles per box.
Questions
How much extra tile should I buy?
The waste allowance starts at a typical figure and you can change it. No standard sets one number, so the table shows the tile and box counts at several allowances, and your supplier or your layout may call for another.
Does the grout joint change the number of tiles?
Yes, a little for large tile and more for small tile. Each tile takes its own size plus the joint on two sides, so a wider joint means fewer tiles for the same area. The calculator uses the joint you type, and no joint if you leave it empty.
How many boxes do I need?
The calculator rounds up the tiles once, then divides by the tiles in a box you pick and rounds up once more to whole boxes. Check the count on your own tile label, because the list of counts is only a set of common choices.