A system for implementing a reusable new product planning model includes a processor executing a new product forecast application. The new product forecast application implements a method. The method includes gathering historical demand data for products in a product set and determining a launch period for the products, the historical demand data broken down by time periods. For each of the time periods, the method includes determining a transition percentage for each of the products, grouping the percentages by respective launch-based time periods, and averaging the percentages, resulting in an averaged transition range. The method further includes calculating fast and slow transition ranges for each of the launch-based time periods and developing a production plan for a new product by applying one of the transition ranges to the new product before product launch, and allocating a remaining demand percentage to existing products in the product set using the selected transition range.