A model is created to predict the heat transfer performance of oblique and normal jet impingement arrays of arbitrary extent. The simplicity of the model, being based on just two equations, allows for ease of implementation and relatively few computations. Comparing the performance of the predictive model with experiment yielded a mean absolute error of 2.9%. Comparison with two frequently referenced correlations in literature show mean absolute errors of 14% and 18% for considerably different test conditions, and comparisons with raw data from these studies have yielded even lower error. The proposed numerical model has a higher accuracy than current CFD implementations and is less computationally involved than full direct numerical simulation.