NUTRICALC is a software program that takes into consideration site index, rotation age, soil properties, effective soil depth, and efficiency of nutrient utilization for estimating nutrient balance and fertilizer recommendations for fast-growing eucalypt in the tropics. Additionally, stand biomass and nutrient content are required if the forest is to be managed by coppicing or replaced by a new one. The program generates three kinds of reports: Technical, which records all the input information and the estimated nutrient balance and recommendations; Operational, which contains the recommended fertilization (if the estimated nutrient balance is negative); and Economic, which states what fraction of the income will be spent on fertilizer.