Boxing ring size varies because of the number of professional Boxing organisations. A standard ring is between 16 and 25 feet (4.9 and 7.6 m) to a side between the ropes with another 2 feet (0.61 m) outside. The platform the ring is on is generally 3 to 4 feet (0.91 to 1.2 m) from the ground with the posts rising around 5 feet (1.5 m). The ring itself has around 1 inch (25 mm) of padding covered by stretched canvas. The ropes are around 1 inch (25 mm) in diameter and held up on posts rising around 5 feet (1.5 m) at heights of 18, 30, 42, and 54 inches (.46, .76, 1.07, and 1.37 m).