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This thesis, entitled "Utilization of the SES Technique for Forecasting Insecticide Sales Quantity at UD. Usaha Bersama," aims to develop a web-based sales forecasting system using the Single Exponential Smoothing (SES) method. This research was motivated by UD. Usaha Bersama's problem in accurately predicting insecticide sales volume each month, which has previously been done subjectively. This forecasting system is expected to assist UD. Usaha Bersama in developing more precise and appropriate production planning and marketing strategies. Insecticide sales data from May 2024 to April 2025 were used as historical data in the forecasting calculations. The results indicate that the SES method can be applied to forecast insecticide sales at UD. Usaha Bersama (Joint Enterprise) has a high level of accuracy, with a Mean Absolute Percentage Error (MAPE) value below 20% for each type of insecticide forecast. This system is expected to facilitate business owners in determining insecticide production quantities according to customer demand and optimizing UD. Usaha Bersama's profits.