How many tiles come in a box? Pieces and sq ft per format

It depends on the format: 12×12 ships 10 pieces (≈ 10 sq ft), 12×24 ships 8 (≈ 16 sq ft), 18×18 ships 5 (≈ 11.3 sq ft) and 24×24 ships 3 (≈ 12 sq ft). Check the sq ft on your box label.

Usually 10 pieces, covering about 10 sq ft installed. It varies by brand from 9 to 11 sq ft — the label rules.

Typically 3 pieces, ≈ 12 sq ft (some references ship 2 pieces ≈ 8 sq ft). Large format means fewer pieces per box and a higher waste factor.

With 10% waste you need 110 sq ft of material: 11 boxes of 12×12 (10 sq ft each), 7 boxes of 12×24 (16 sq ft each) or 10 boxes of 24×24 (12 sq ft each).

Because shade and caliber are only guaranteed per full box of the same dye lot. If the math leaves you half a box short, buy the full box and keep it as attic stock.