How to use
- Choose Imperial or Metric.
- Enter the floor length and width, the tile size and the grout joint.
- Set the extra for waste and the number of tiles per box.
- Read the number of tiles and boxes.
Options explained
- Grout joint
- The gap between tiles, commonly 1/16 to 1/4 inch (1.5–6 mm). Each tile is counted with half a joint on every side.
- Extra for waste
- 10% for a straight layout; 15% or more for diagonal layouts, small rooms or lots of corners.
- Tiles per box
- Printed on the box. Set 0 to skip the box count.
Examples
Tile counts include 10% extra for cuts and breakage. Imperial examples use a 1/8 in grout line; metric examples use 2 mm.
| Area | Tile size | Tiles needed |
|---|---|---|
| 10 × 12 ft floor (120 ft²) | 12 × 12 in | 130 |
| 10 × 12 ft floor (120 ft²) | 12 × 24 in | 65 |
| 10 × 12 ft floor (120 ft²) | 18 × 18 in | 58 |
| 5 × 8 ft bathroom floor (40 ft²) | 12 × 12 in | 44 |
| 30 ft² kitchen backsplash | 3 × 6 in subway | 249 |
| 4 × 3 m floor (12 m²) | 600 × 600 mm | 37 |
| 4 × 3 m floor (12 m²) | 300 × 300 mm | 145 |
| 4 × 3 m floor (12 m²) | 800 × 800 mm | 21 |
| 2.4 × 2 m bathroom wall (4.8 m²) | 300 × 600 mm | 30 |
Large-format tiles and diagonal layouts waste more at the edges — use 15% instead of 10% for those.
Frequently asked questions
How many 12 × 12 tiles for a 12 × 10 room?
The floor is 120 ft². With 1/8-inch joints each tile covers about 1.02 ft², so you need about 118 tiles, or 130 with 10% extra.
Why add extra tiles?
Tiles along walls are cut, some break, and keeping a few spares helps with later repairs because colour batches change.
Does it work for walls?
Yes — enter the wall width and height as the length and width, and subtract windows yourself.
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