The teak tree (Tectona grandis) has several positive contributions to the environment quality wood raw materials, deep and strong roots to help maintain soil stability and prevent erosion and habitat for various types of animals. On the other hand, teak also has an important role in producing oxygen and rarely do people directly see the growth of teak trees from small to large because it can take decades. This study aims to academically develop the Teak Tree Computational Model (TTCM) by using the method of Functional-Structural Plant Modeling (FSPM) and the growth Grammar- related Interactive Modelling Platform (GroIMP). FSPM and GroiIMP operated to morphologically construct the virtual Teak tree growth from trunk, branch and leaf to analyze its environmental and economic contribution. The dataset used in this research was 20 years of growth of the teak tree in Saradan, East Java, Indonesia. The model can simulate the morphological growth mechanism of single and multi-teak trees and can predict the contribution environmentally and economically. The model simulated that one 20-year-age teak tree can produce 17 L per hour of oxygen and Indonesian Rupiah (IDR) 1,200,000 of wood while in the real world teak tree can produce about 15 L per hour of oxygen and IDR 850,000-1,550,000.