Explosives are energy materials used for a variety of purposes. Knowledge of the particular characteristics of commercial explosives and their correlation makes it possible to determine the scope of use. The curvature of the detonation front of a nonideal detonation explosive is one of the parameters that determines the degree of nonideality of the detonation process. Its size also determines the critical diameter of the explosive and affects the detonation velocity and detonation pressure. The curvature of the detonation front of a nonideal detonation explosive can be measured and calculated using models and formulas. The paper gives an overview of methods for measuring the curvature of the detonation front of nonideal detonation explosives, ie mathematical calculation models.