Enter the area to cover, your tile size, and tiles per box — get the number of tiles and boxes to buy, with a waste allowance so cuts don't leave you short.
Work out how much area one tile covers (width × height, in square feet), then divide your total area by it — plus a waste allowance — to get the tile count, and divide by tiles-per-box for boxes. A 12 × 12 inch tile covers exactly 1 square foot, so 100 square feet needs 100 tiles plus waste. Bigger tiles cover more each; smaller tiles and mosaics need many more.
You always cut tiles at the edges of a room, around fixtures, and to fit — and those cuts waste material. 10% is the standard allowance for a straight layout; use 15% for diagonal or herringbone patterns, or a small, cut-up room where more tiles get trimmed. The calculator rounds up to whole boxes, since you buy tile by the box.
Tile color varies slightly between production runs, so buy all your tile at once from the same batch (lot number) — a mid-project top-up may not match. And keep a spare box after the job: cracked tiles happen, and matching a discontinued tile years later is often impossible.
With 12 × 12 inch tiles (1 sq ft each) and a 10% waste allowance, about 111 tiles — roughly 12 boxes of 10. Smaller tiles need more; larger tiles fewer. Enter your exact tile size above.
About 10% for a standard straight layout, and 15% for diagonal or herringbone patterns or a small, cut-up room. The extra covers edge cuts, fixtures, and breakage.
Yes — tile color varies slightly between production runs, so buy it all at once from the same lot number. Keep a spare box too; matching a discontinued tile later is often impossible.