Flooring / Tile Calculator
Enter a room's dimensions and a tile's size to see how many tiles — and boxes — to buy, including a waste allowance.
Flooring / Tile Calculator
Results
- Room area
- 20.00 m²
- Tiles to buy
- 62
- Boxes to buy
- 16
- Area covered
- 22.32 m²
How to calculate tiles and boxes needed for a floor
Enter a room's dimensions and a tile's size to see how many tiles — and how many boxes — to buy, including a waste allowance.
How the calculation works
- Formula
tiles = ceil((room_area / tile_area) × (1 + waste%))
How to use it
- Enter the room's length and width, in meters.
- Enter the tile's length and width, in centimeters.
- Enter a waste percentage and, optionally, tiles per box.
Choosing a waste allowance
10% is a common default for a simple rectangular room laid straight. Diagonal layouts, herringbone patterns, rooms with many corners, or a first-time DIY installation typically warrant 15–20% instead, since more tiles get cut down or broken.
Privacy
Runs locally in your browser. No data is sent to the server.
FAQ
How much waste should I add?
10% for a simple rectangular room and a straight layout; 15–20% for diagonal or patterned layouts, irregular rooms, or if you're new to tiling.
Does this account for pattern layouts like herringbone?
No — it assumes a simple grid layout. A patterned layout wastes more material than this estimate accounts for, so raise the waste percentage to compensate.
What if my room isn't a rectangle?
Split it into rectangular sections, calculate each separately, and add the tile counts together — the area-based math stays accurate as long as each section is measured correctly.