This article develops a modular procedure to perform force-displacement modeling of planar flexurebased Compliant Mechanisms (CMs). The procedure is mostly suitable for planar lumped CMs. To achieve the position analysis of CMs requires: (i) to implement the kinematic analysis as in the case of ordinary mechanisms, (ii) to solve the equilibrium problem by means of a static analysis and (iii) to model the flexures behavior through a deflection analysis. The novel contribution of this article relies on the fact that a division strategy of the CM into Assur sub-chains is implemented, so that any CM subjected to such disaggregation can be accurately modeled. For this purpose a mathematical model for the leaf-spring flexure type is presented and used through this paper. However, any other flexure model can be used instead. To support the technique, a three Degree-Of-Freedom (3-DOF) flexurebased parallel mechanism is used as case study. Results are compared with a Finite Element Analysis (FEA).