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Tiles needed = room area / tile area. Standard waste: 10% for straight lay; 15% for diagonal; 20% for intricate patterns or non-square rooms. Tile area = (tile size + grout gap)². Buy full boxes, not individual tiles, to match dye lots. For large-format tiles (24×24+), check floor flatness—lippage becomes visible with deflection >1/8 inch in 10 feet. Add 5 extra tiles for future repairs.
120 tiles