PROBLEM TO BE SOLVED: To provide a saturation magnetization prediction method and a saturation magnetization prediction simulation program capable of easily calculating the saturation magnetization of a single-phase magnetic phase at a finite temperature. SOLUTION: By substituting actual measurement data of saturation magnetization at a finite temperature into Kuzmin's equation, the saturation magnetization at absolute zero and the Curie temperature are calculated at the first step 10 and the absolute zero calculated in the first step 10. The saturation magnetization and Curie temperature of No. 1 and the saturation magnetization and Curie temperature at absolute zero calculated by the first-principles calculation are assimilated into data, and the single-phase magnetic phase is obtained for each of the saturation magnetization and Curie temperature at absolute zero. Saturation at a finite temperature by applying the prediction model formula expressed by the function of the abundance ratio of the constituent elements to the Kuzmin formula in the second step 20 for deriving the prediction model formula expressed by the function of the abundance ratio of the constituent elements by machine learning and the prediction model formula created in the second step 20. A saturation magnetization prediction method 50 and a saturation magnetization prediction simulation program 60, which include a third step 30 of calculating the magnetization. [Selection diagram] Fig. 1
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