The static and dynamic (free vibration) analyses of plate structure have been conducted in this study using ANSYS workbench, a finite element tool. Firstly, the unstiffened plate is modelled to determine the deflection, stress, and natural frequencies. Further, the stiffened plates are modelled by redistributing the material of the unstiffened plate to determine the deflection and natural frequencies. Stiffened plates with a single flat stiffener and three flat stiffeners are modelled considering the same volume of material used to model unstiffened plates. A pressure of 10 kPa is applied on the plate structure to assess the static response for clamped support and hinged support on all edges. Eight-nodded plate and two-nodded beam elements are used to model plate and stiffener, respectively. A convergence study has been conducted on an unstiffened plate to optimise the mesh division. The plate responses are enhanced after stiffening, which is also quantified in this study. A comparison has been incorporated among unstiffened and stiffened plates to check the effectiveness of single or three stiffeners. These stiffened plates can be used in different applications where structural enhancement is necessary.