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The quality traits of a single grain kernel can give index to the overall quality of a grain bulk, because it is individual kernels that comprise a grain bulk. Therefore, the single- kernel drying behavior is important to understand the overall quality of grain. A Matlab and Visual C++ based software package was developed in this study for describing single-kernel drying, tempering and internal stress analysis. Non-linear and transient partial differential heat and mass transfer equations describing the single kernel drying and tempering processes were solved using the finite element method. Temperature- and moisture-dependent viscoelastic properties were applied to the stress analysis of a single rice kernel. A graphical user interface, and 2D/3D graphics for temperature, moisture content and stress changes were developed. The simulation results were validated by thin-layer drying data and subsequent tempering experiments of rough rice. This simulation tool can be used for predicting temperature, moisture content and internal stress distribution in a single kernel.