In this paper the extensive calibration procedure of a hybrid model for predicting cavitation inception in freeshear layers described.The hybrid model treats the cavitation process as two decoupled processes,a hydrodynamicone and a bubble dynamic one.The hydrodynamic part is modeled by a small-scale physical model,whereas thebubble dynamic part is solved mathematically.Besides a short explanation of the hybrid model,the procedure offixing the free parameters of the mathematical formulation by given(measured)data from diverse test facilities isexplained.