How many tiles do I need?
Pop your measurements in and this works out the tiles for you — area, wastage, and the lot. Fifteen years of quoting jobs says: always order the spare.
Your estimate
How to measure up
- 1Measure the length and width of your floor or wall in metres.
- 2Multiply length × width for each section and add them together.
- 3Subtract large non-tiled areas — doors, windows, baths, or units.
- 4Enter your tile size in millimetres (it is printed on the box).
- 5Pick your lay pattern — the calculator adds the right wastage for you.
Got an L-shaped room? Split it into rectangles, measure each as a separate area, and add them with the “Add another area” button. Need a hand picking the tile? Our buying guides walk through it.
Common questions
How many tiles do I need?+
Measure the area you are tiling in square metres, add 10% for wastage, then divide by the area of a single tile. For a 10 m² floor with 600 × 600mm tiles (0.36 m² each) you need about 31 tiles once wastage is added. The calculator above does the maths for you.
How much wastage should I add?+
Add 10% for a straight or brick-bond lay, and 15% for herringbone, diagonal, or large-format tiles — those patterns create more offcuts. Bump it higher again for a small room full of awkward cuts.
Why do I need extra tiles?+
Cuts, breakages, and future repairs. Tile colours are mixed in batches, so a box bought two years later rarely matches. Keep one full spare box sealed for repairs.
Do I measure in metres or millimetres?+
Measure the room in metres or centimetres, and enter the tile size in millimetres — that is how tile sizes are listed (600 × 600, 300 × 600, and so on). The calculator handles the conversion.
Does this work for both walls and floors?+
Yes. Use the Floor / Wall toggle at the top. The maths is identical — area to tile, divided by tile size, plus wastage — so the calculator covers both.