Over the years, piezoelectric devices have found particular use in the energy harvesting sector. Researchers in a variety of technical applications are drawn to these generators because of their simplicity. The objective of this work is to provide a rigorous process for estimating the potential for electrical energy generation from piezoelectric devices while taking various piezoelectric dimensions into account. To calculate the amount of energy that can be extracted from the constant load of 6 MPa on the upper and lower surfaces of a piezoelectric device, a finite element model of the device is created. Four distinct piezoelectric models with varying diameters were studied. The stresses along the vertical axis, the displacement in the x-direction, the electrical displacement along the polarization direction, and the output electrical energy were all examined.