Tile calculator
EverydayHow many tiles do I need?
Tiles and boxes, flooring packs or wallpaper rolls for a floor or wall, with extra for cuts and waste.
What you enter stays on your device while you use this tool. Opening a shared link sends the settings in its address to HowToolbox to prepare the page.
Sizes and extra
About 10 % is common; take more for diagonal laying, small rooms or large tiles.
You need
147 tiles
15 boxes of 10 · 12 m² plus 10% extra
Areas and amounts
- Surface area
- 12 m²
- With the extra
- 13.2 m²
- Tiles in the boxes
- 150
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Tiles and boxes, flooring packs or wallpaper rolls for a floor or wall, with extra for cuts and waste.
How to use
- Pick tiles, flooring or wallpaper.
- Enter the surface: a floor's length and width, or for wallpaper the walls' total width and their height. Then the tile size or the area per pack.
- Below, set the extra for cuts and waste and the box or roll size; read how many to buy.
How it works
Tiles and flooring are counted by area. The surface is length × width; add an allowance for cut pieces, breakage and mistakes; then divide by one tile's area, or by the area a pack covers, and round up.
Wallpaper is counted in strips, because a roll is cut into lengths that each run from the ceiling to the floor. The walls need their width divided by the roll width, rounded up, in strips. Each strip is the wall height plus the pattern repeat, and a roll gives as many whole strips as fit its length; the offcut is waste. A standard European roll is 0.53 m wide and 10.05 m long, so 2.5 m walls get 4 strips from a roll.
The extra allowance is a rule of thumb, not a measurement: about 10 % is common for straight laying, and more is wise for diagonal patterns, small rooms with many cuts, or large tiles. Buy everything from the same batch, and keep a few spare pieces for repairs. Windows and doors are not taken off; leave them in, or reduce the wall width yourself.
Worked example
How many 0.3 m square tiles cover 3 × 3 m with 10% extra?
- 3 × 3 × (1 + 10 ÷ 100) = 9.9 m².
- 9.9 ÷ (0.3 × 0.3) = 110.
Buy 11 boxes of 10 tiles.
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Frequently asked questions
How much extra should I buy?
About 10 % for a simple room laid straight. Use 15 % or more for diagonal or herringbone patterns, rooms with many corners, or tiles that break easily.
Do I count the grout lines?
No. Joints of a few millimetres hardly change the count, and the extra allowance covers them.
Why does wallpaper need more than the wall area?
Each strip is cut to the wall height plus the pattern repeat, and what is left at the end of a roll is often too short for another strip.
Should I subtract windows and doors for wallpaper?
Usually not: the strips beside and above them still use most of a roll. Subtract only a very wide opening, such as a patio door.
Can I mix tiles of different sizes?
Calculate each size separately for the area it covers. This estimate uses one tile size at a time.
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