How many tiles and boxes your floor really takes — cuts, breaks and layout waste already counted, so the store trip happens once.
The waste factor covers cuts along walls, the tile that snaps on the wet saw, and the one you drop. Straight lays lose about 10%; diagonal and herringbone patterns lose 15% because every edge tile gets cut at an angle. Small rooms with lots of corners waste proportionally more, not less.
But here's the reason to add one box beyond our number: dye lots. Tiles are batch-made, and a box bought six months later — same brand, same name — will be a slightly different shade. When a tile cracks in year three, that spare box in the garage is the only one on Earth that matches your floor. Check the lot numbers printed on the boxes match when you buy, too.
Box coverage varies by brand (it's printed on the box, usually 8–12 sq ft) — plug in the real number before you order.
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