The actual measurement of the body surface area generally take much trouble. And the existance of some interrelation among the height, weight and the others now lead to the calculation of the body surface area using a way of multipling these factors by a constant coefficient. After much investigation about a variety of calculation formula which have desingned by now we reached a conculusion that a from A=K₁X+K₂Y+Q (Howland-Dana from) is more desirable than the others, above all by applying X for the height (Hcm) and Y for the weight (Wg) the most desirable approximation can be got. From this point of view we achieved a new calculation formula for Japanease adult man and woman as follows. A=0.0901W+62.49H+266 for man and A=0.1309W+ 37.33H + 1799 for woman come as the result.