The performance of the induction motors (IMs) in transient and steady-state operation can be adjusted by inclination of the rotor bars to some extent. This paper proposes an augmented analytical approach using free finite-element analysis software to study the effect of the inclination angle on the performance of IMs. The electric equivalent circuit (EEC) parameters, except the rotor leakage inductance, are found from the existing sizing equations. A such, the paper offers new equation for estimation of the rotor side leakage inductance. The magnetostatic analysis is employed using free FEMM Software to find the saturation level of the studied IMs. The calculation of the saturation level is used to estimate the rotor side and magnetization inductance with higher accuracy. The proposed model accuracy is validated against FEA. An optimization problem is defined to maximize the efficiency, starting torque, and rated torque with a certain weighting. The optimum inclination angle is determined using the developed augmented analytical model (AAM). The performance of the optimal design for two different classes of the IMs (i.e., Class A and Class B) are compared against the IMs with zero-inclination rotor bar angle. The results show the effectiveness of the calculation of optimal inclination angle for the IMs.