This app is used to help convenience store owners manage their own goods. The user only needs to enter the sales price, cost, monthly sales volume and average inventory of a certain commodity, and then the value related to the commodity cross ratio will be obtained, so that the profitability of the commodity can be judged intuitively, and the gross profit rate or inventory turnover times can be adjusted according to the size of the value. So as to maximize the profit of commodities. It is convenient for shopkeepers to manage their own goods and obtain more profits.