All of our square tiles measure 15 centimeters on each side, which comes to almost 6inches with a thickness from 1/10 inch to slightly thicker. The house number tiles and borders are 1/10 inch thick, with the numbers measuring 3 inches across and borders measuring 1 inch across. Both are 15 cm (almost 6 inches) tall. The kitchen and bathroom markers measure 15 cm (almost 6inches across and almost 3 inches in height.