This article explores the history, average heights, factors affecting height, maximum heights achievable, famous tall people from Japan, genetics and other related topics to answer the question of what is the maximum height achievable in Japan. The average height for adult males in Japan is 171 cm (5 ft 7 in) and for adult females it is 158 cm (5 ft 2 in). There are many factors that can affect a person's height including nutrition, exercise, genetics and environment. It is believed that humans can reach up to about 250 cm or 8 feet 2 inches tall under ideal circumstances but this figure may vary depending on individual genetics. There are many famous tall people from Japan including professional basketball player Yuta Watanabe who stands at 206cm or 6ft 9in tall. Genetics plays an important role when it comes to determining a person's overall height as some families tend to produce members with greater heights than others due to their genetic makeup alone.