Jet impingement heat transfer has received a remarkable amount of attention by researchers throughout the world for many years due to widespread interest from both academic and industrial points of view. However, the fluid dynamics involved with arrays of jets are very complex and still not completely understood. Therefore, a functional relationship of the Nusselt number, which involves thermophysical and dynamic quantities as well as geometric parameters, is still not univocally and generally established. In this research analysis, some empirical equations, which are available in the literature for arrays of round impinging jets, are reviewed, and a new, simpler correlation is developed that better represents experimental data published by several researchers.