How many tiles and boxes a floor or wall needs, with wastage.
Tiles needed
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Boxes to buy
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Estimated cost
A geometric estimate for a rectangular area with minimal cuts. Complex layouts, diagonal patterns and large tiles need more wastage than the default allows for.
How this works
Tile area = width × height
Tiles needed = (room area ÷ tile area) × (1 + wastage %)
10% wastage is a common default for a straightforward rectangular layout; increase it to 15-20% for diagonal patterns, herringbone, or a room with many corners.
Buy all boxes from the same production batch (check the lot number) — colour can vary slightly between batches.
Larger tiles need fewer total pieces but more waste per cut, since a single cut tile is discarded even if only a sliver was trimmed off.
Currency
Amounts follow the currency selected above.
How much extra tile should I buy?
10% is a reasonable default for a simple rectangular room. Increase to 15% or more for diagonal layouts, small or oddly shaped rooms, or a pattern that wastes more per cut.
Should I round up to full boxes?
Yes — this calculator rounds the final count up to whole boxes, since suppliers do not sell partial boxes and having a spare tile or two is useful for future repairs.
Does grout width matter for this calculation?
Not significantly for an estimate — grout lines are thin relative to a tile's area. For a precise count on a large expensive job, add the grout width to each tile dimension before entering it.
How do I calculate tiles for an L-shaped or irregular room?
Split the room into rectangles, find the area of each separately, and add them together before entering the total area above. This keeps the calculation accurate for any floor plan, not just a simple rectangle.