PROBLEM TO BE SOLVED: To provide a heat storage amount calculation method and a heat storage amount calculation device capable of calculating latent heat storage amount of latent heat storage material simply and highly precisely.SOLUTION: In a heat storage amount calculation method on a latent heat storage tank 1 in which latent heat storage material 3 and water 2 are stored, coagulation solid phase rate function determined by relation of coagulation time until solid phase rate of the latent heat storage material 3 gets to maximum from zero and the solid phase rate and melting solid phase rate function determined by relation of melting time until the solid phase rate of the latent heat storage material 3 gets to zero from the maximum and the solid phase rate are stipulated beforehand, temperature of the latent heat storage material 3 or water 2 on the surrounding of the latent heat storage material 3 is periodically measured, a time during which the temperature is below the phase transition temperature of the latent heat storage material 3 or a time during which the temperature exceeds the phase transition temperature is applied to the coagulation solid phase rate function or the melting solid phase rate function to calculate the solid phase rate of the latent heat storage material 3 and the solid phase rate of the latent heat storage material 3 is utilized to calculate the latent heat storage amount of the latent heat storage material 3.
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