Tile Size Calculator
Enter the length and width of the floor or wall, pick your tile size and joint width, and choose a waste allowance. The calculator works out how many tiles and boxes to buy, plus the grout and adhesive.
- Tiles and boxes
- Grout and adhesive
- Any tile size
For walls, enter the height as the width and take off big openings such as doors and windows.
Tiles are counted by area, then rounded up for cuts. Divide the area by the size of one tile plus its joint. Then add 10% for cuts and breakages, or 15% if you lay the tiles diagonally or in a herringbone pattern.
Tile count chart
Per 10 m², 3 mm joints, 10% waste. Search for a tile size.
| Tile (mm) | Tiles | Grout (kg) |
|---|---|---|
| 100 × 100 | 1037 | 9.6 |
| 200 × 200 | 267 | 4.8 |
| 300 × 300 | 120 | 3.2 |
| 300 × 600 | 61 | 2.4 |
| 600 × 600 | 31 | 1.6 |
| 600 × 1200 | 16 | 1.2 |
Larger tiles waste more at the edges of small rooms. Use 15% for tiles over 600 mm.
Tile size and count
A 4 × 3 m floor. Slide the tile size.
The floor is drawn with the tiles laid in a brick pattern. Some tiles are shaded so you can count them.
How to work out tiles
Area, then tiles. Step through it.
Measure
Length × width.
Buy all the tiles from one batch. Shades change slightly between batches.
Small, medium or large format
Tile sizes. Compare them.
100 to 200 mm.
300 to 600 mm.
600 mm and up.
Large tiles need a very flat floor, within about 3 mm over 3 m, or the edges catch.
Before ordering
Tiling checks. Tick each item.
Tick each item as you go.
Lay out a row of tiles dry before fixing to see where the cuts fall, and centre the pattern in the room.
What you get
Tiling order. Each tile explains one result.
With waste.
To buy.
m² and sq ft.
kg.
kg.
Adhesive use depends on the trowel. About 4 kg per m² is typical for a 10 mm notched trowel.
Frequently Asked Questions
No question matches that search.
How do I work out how many tiles I need?
Divide the area by the area of one tile plus its joint, then add 10% for cuts.
How much waste should I allow for tiles?
About 10% for straight laying and 15% for diagonal, herringbone or large tiles.
How many tiles in a square metre?
About 11 of 300 × 300 mm tiles, or nearly 3 of 600 × 600 mm with joints.
How much grout do I need?
It depends on tile size, joint width and depth. Small tiles with wide joints use the most.
Should I use the same tile size on walls and floors?
You can, but floor tiles must be rated for floors, and heavy tiles on walls need strong adhesive.
Do bigger tiles make a room look bigger?
Usually, because there are fewer grout lines.
How many spare tiles should I keep?
A few, from the same batch, for repairs later.
Tiles counted, not guessed
Measure the area, choose the tile and joint and add waste for the pattern. Buy whole boxes from one batch and keep a few spares.
More size calculators
Each one has its own calculator, worked examples and answers to common questions.