I devised Top-end Coefficient Method for measuring the utilizing volume of standing trees. For the purpose of determining the Top-end Coefficient, 50 standing trees were selected by the table of random numbers from the Cryptomeria stand which was exist at V forest compartment in Yamagata Pref. The stand consists of trees, being 40 years of age, 19.23m in average height and 26.0cm in average d. b. h. By this method, the top-end diameter of sectional log per 2 meters can be measured by multiplying the Top-end Coefficient (t_n) to d. b. h. (D_1·2). So I named this t_n “Top-end Coefficient” Then we can calculate D_2n Which is the top-end diameter sectioned per 2 meters as follows: t₁=D_2·0/D_1·2, t₂=D₄₀/D_1·2, ····t_n=D_2n/D_1·2 hence, D_2·0=D_1·2t₁, D_4·0=D_1·2·t₂··D_2n=D_1·2·t_n n=1, 2, 3, ····8. These results of “t_n”and its practical value are shown in Tab. 3&4. The utilized log volume of standing tree can be calculated by suming up the volume of each log which will be found in the log table. The difference between the Top-end Coefficient Method and the Measued Method is very little, and the errors-rate in case of 50 standing trees is -1.39% per 25.815 m³ as shown Tab. 5&6. I can say, therefore, that this method is more practical one for buying and selling the standing trees.