Takahira's calculation formula of the Japanese body surface area, A=W0.425×H0.725×71.84 (A=cm2, W=kg, H=cm) is early known which was designed on the basis of the physique of ten Japanese men in the 1920's. While it is not inconvenient in the practical use it rather looks oldish. Therefore we actually measured the body surface area of Japanese men and women in 1954-1961 and could success in making a new calculation formula based on these values of actual measurements.
We compared and studied or investigated of many kinds of calculation formulas of the body surface area which have been published up to now and could success in reaching to a satisfactory result. From the result a form A=K1W+K2H+Q (W=weight, H=height) is the most adaptable as the calculation formula for getting an approximation of the body surface area.
According to this formula we made up various kinds of calculation formulas for the body surface area in the sex and the age respectively and investigated the adaptiveness and at last confirmed the practicality. (Table IX)
