A zero-dimensional droplet vaporization model for spray simulations is presented along with a numerical solution algorithm. The model is equipped with high-pressure property estimation methods (PEM), taking into account the influence of high pressure on physical properties of liquid and gas and on vapor-liquid equilibrium; as well as with low-pressure PEM, simplified for low pressure. It is shown that good results can be obtained with the model for situations where droplet-internal transport is important and even for hearing to the critical state. Differences of results obtained with low- and high-pressure PEM are discussed for vaporization at elevated pressure.