A 10 × 8 ft floor with 12 in tiles
area length 10 ft, area width 8 ft, tile length 12 in, tile width 12 in, grout joint 0.125 in, tiles per box 10 pcs.
Tiles to buy, including waste
87 tiles
- Tiles incl. 10% waste: 87
- Boxes needed: 9
Tile Calculator
This tile calculator gives how many tiles and boxes you need for a floor, wall or backsplash from the area, tile size, grout joint and waste.
Last updated
How many 12 × 12 in tiles do I need for a 10 × 8 ft floor?
With a 1/8 in grout joint you need 79 tiles, or 87 with 10% waste. That is 9 boxes of 10.
Tiles to buy, including waste
87 tiles
- Area to tile
- 80 ft²
- Tiles needed (no waste)
- 79
- Tiles incl. 10% waste
- 87
- Boxes needed90 tiles in 9 boxes
- 9
Inputs
- How do you want to measure?: Length × width
- Area length: 10 ft
- Area width: 8 ft
- Tile length: 12 in
- Tile width: 12 in
- Grout joint: 0.125 in
- Tiles per box: 10 pcs
- Waste / overage: 10 %
- • Order all tiles at once from the same production lot to avoid shade differences.
Results are estimates for planning only. Supplier specifications, product yields, site conditions and local codes vary. Confirm quantities with your supplier or a qualified professional before you buy or build.
How this is calculated
Formulas
- Area = length × width.
- Tile footprint = (tile length + joint) × (tile width + joint).
- Tiles = area × (1 + waste %) ÷ tile footprint, rounded up.
- Boxes = tiles ÷ tiles per box, rounded up.
Assumptions
- The area is a simple rectangle. For complex shapes, add rectangles together.
- Waste covers cuts and breakage. Diagonal layouts and large-format tiles need more.
- Grout, adhesive, spacers and trim are not included.
Worked examples: common projects
A 3 × 2.5 m floor with 30 cm tiles
area length 3 m, area width 2.5 m, tile length 30 cm, tile width 30 cm, grout joint 3 mm, tiles per box 10 pcs.
Tiles to buy, including waste
90 tiles
- Tiles incl. 10% waste: 90
- Boxes needed: 9
An 8 × 6 ft bathroom floor with 12 × 24 in tiles
area length 8 ft, area width 6 ft, tile length 12 in, tile width 24 in, grout joint 0.125 in, tiles per box 8 pcs.
Tiles to buy, including waste
26 tiles
- Tiles incl. 10% waste: 26
- Boxes needed: 4
A 10 × 2 ft backsplash with 3 × 6 in tiles
area length 10 ft, area width 2 ft, tile length 3 in, tile width 6 in, grout joint 0.125 in, tiles per box 50 pcs.
Tiles to buy, including waste
166 tiles
- Tiles incl. 10% waste: 166
- Boxes needed: 4
Quick reference
Tiles per 100 sq ft by tile size
With a 1/8 in grout joint. The waste column adds 10%.
| Tile size | Tiles (no waste) | Tiles (10% waste) |
|---|---|---|
| 4 × 4 in | 847 | 931 |
| 6 × 6 in | 384 | 423 |
| 12 × 12 in | 98 | 108 |
| 12 × 24 in | 50 | 55 |
| 24 × 24 in | 25 | 28 |
Tiles per square metre by tile size
With a 3 mm grout joint. The waste column adds 10%.
| Tile size | Tiles (no waste) | Tiles (10% waste) |
|---|---|---|
| 10 × 10 cm | 95 | 104 |
| 20 × 20 cm | 25 | 27 |
| 30 × 30 cm | 11 | 12 |
| 30 × 60 cm | 6 | 7 |
| 60 × 60 cm | 3 | 4 |
Before you buy tile
The grout joint makes each tile 'bigger' on the wall by the joint width, so the calculator uses tile size plus joint to count how many fit. It matters most with small tiles.
Order all your tiles at once, from the same production lot. Shades vary between batches, and extra tiles are useful for future repairs. Covering a whole room in planks instead? Use the flooring calculator.
Tile size, layout and waste
Smaller tiles mean more joints and more cutting around edges, and bigger tiles waste more at the room's edges. Straight (grid) layouts waste the least. Diagonal and brick-bond patterns need more tiles, so raise the waste percentage. Large-format tiles also need a flat substrate.
Measure the area to the finished edges, and treat any section that is not rectangular as separate rectangles. For walls and backsplashes, enter the width and height as the two dimensions, and calculate each wall separately.
Tile calculator in square feet or square metres
Choose I know the area to enter square feet or square metres for a floor, a wall or a backsplash. Enter the tile size in inches or centimetres, and the grout joint in inches or millimetres, and you get the tiles and boxes, with waste added.
Frequently asked questions
How much extra tile should I buy?
10% is a common minimum. For diagonal layouts, large tiles or rooms with many corners, 15–20% is safer.
Does grout width change how many tiles I need?
Yes, slightly. Wider joints mean each tile covers a little more area, so fewer tiles are needed.
How do I tile a wall?
Enter the wall's width and height as the length and width, and subtract any openings by calculating separate areas.
Why is the box count higher than I expected?
Boxes are whole units, so the count is rounded up. Extra tiles in the box are your spares.
How many 12 × 12 tiles are in 100 square feet?
With a 1/8 inch grout joint, 98 tiles. Add 10% for waste and you need about 108.
How many tiles do I need for a backsplash?
Multiply the backsplash's width by its height for the area, and enter those as the length and width. Subtract nothing for outlets, since the cut tiles are covered by the waste allowance.
How many tiles do I need per square metre?
With 30 × 30 cm tiles and a 3 mm joint, about 11 per square metre. Switch the calculator to metric to try your own tile size.
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Results are estimates for planning only. Supplier specifications, product yields, site conditions and local codes vary. Confirm quantities with your supplier or a qualified professional before you buy or build.