The prediction of pressure decay, density and shrinkage of injection molded parts is based on the pressure-volume-Temperature (PVT) equation of state. The PVT of materials is typically characterized at equilibrium or near-equilibrium conditions which are far-removed from the rapid cooling rates occurring during injection molding. In this study, a cooling rate dependent PVT model for amorphous polymers is implemented as a user-PVT function interfacing to the Moldflow Insight software. Predicted shrinkage values are compared to measured data for a number of amorphous materials at three different part thicknesses. Not only were improvements in the shrinkage magnitude observed, but also improvements in the trend of shrinkage changes with respect to part thickness (and cooling rate) were observed.