A quantitative evaluation of the increase in the number of crystalline PS 4 3units during crystal growth was performed. Crystallinity increased at a constant rate until crystal growth reached a saturation state, leaving only a small number of glassy PS 4 3units. Crystallization rates, calculated from the relationship between time and crystallinity in the simulations, exhibited a strong dependence on the crystalline planes forming the interface. The equilibrium and growth forms of the crystalline shape were displayed according to Wulff's theorem.