The regulation height of a dart board for both soft-tip and steel-tip play is 5 feet 8 inches from the floor to the center of the bulls-eye. The board must be mounted flush to the wall with the "20" at the top, according to Dart Brokers.
The standard international board is known as a "clock" board measuring 18 inches in diameter. The board consists of 20 pie-shaped segments equal in size surrounding the bulls-eye at the center, with an outer bull around it. Each numbered segment contains an outer and inner ring, which count for double and triple the value of the segment, respectively. The throwing line for steel-tip play is 7 feet 9 1/4 inches from the front of the board, while the soft-tip line rests exactly 8 feet from the board. While a piece of tape will suffice, tournament play often features a piece of wood 1 1/2 inches high, known as a hockey.