Free wall tile calculator: calculate how many tiles and boxes you need. Input wall area, tile size, and waste percentage. Perfect for bathroom, kitchen, and backsplash tiling projects.
Tiling a wall requires knowing exactly how many tiles to buy — too few means a second trip to the store (and potentially a different dye lot), too many means wasted money. This calculator estimates the number of tiles and boxes you need based on wall area, tile dimensions, and a waste allowance for cuts and breakage.
Enter your wall area, the size of your chosen tiles, and the number of tiles per box (check the packaging). The waste slider defaults to 10%, which covers most straight-lay patterns. Increase it for diagonal layouts or complex rooms with many corners. The result tells you both the tile count and how many full boxes to purchase.
Multiply the wall height by width for each wall, add them together, then subtract the area of large openings (doors, windows). For simple rectangular walls this is straightforward — a 2.5m × 3m wall is 7.5 m². For irregular walls, break them into rectangles and add the areas.
Add 10% for standard rectangular layouts. Add 15% for diagonal (diamond) patterns or herringbone layouts which produce more offcuts. Add 20% if you're tiling around many obstacles (pipes, alcoves, windows) or if the walls are significantly out of plumb.
Not necessarily — in fact, larger tiles (60×60 cm) can produce more waste in small rooms because each offcut is large. The ideal tile size balances the room dimensions: tiles that fit evenly into the wall width and height produce minimal waste. Use 30×30 cm as a starting point for most residential bathrooms.