The retail inventory method helps retailers estimate inventory value without conducting a full physical stock count. This guide explains how the method works, how to calculate ending inventory using the cost-to-retail ratio, and where it fits within modern retail operations. You'll also learn the advantages and limitations of the approach, how it compares to FIFO and other valuation methods, and why many retailers are moving beyond estimation with forecasting, replenishment, and inventory planning software. Whether you're in finance, inventory management, or retail operations, understanding the retail inventory method provides valuable context for making smarter inventory decisions.