Grounding grids are critical components of electrical systems, ensuring safety and reliability by minimizing ground potential rise (GPR), contact voltage, and step voltage. However, the economic implications of different grounding grid configurations, particularly regarding conductor material costs, require further investigation. To be specific, the cost differences between equally spaced and unequally spaced grounding grids under various soil conditions remain unclear. This paper utilizes the CDEGS grounding analysis software to establish five soil models with different parameters. Through simulation, the grounding performance of unequally spaced grounding grids in various soil models is evaluated. At the same contact voltage level, the conductor costs of the two types of grounding grids are compared for each soil model. The study results show that in a two-layer horizontal stratified soil model, as the resistivity of the lower soil layer increases, unequally spaced grounding grids save more conductor material compared to equally spaced grids, significantly reducing conductor costs. The research method and findings presented in this paper offer a valuable reference for the design and optimization of grounding grids, providing practical insights into reducing construction investment while maintaining effective grounding performance.