Gas hydrates are a well-known problem in the oil and gas industry that cost millions of dollars in production and transmission pipelines. Of the thermodynamic models in the literature, few can predict the hydrate formation temperature or pressure for complex systems which include inhibitors. Two new correlations can calculate the hydrate formation pressure or temperature for single components or gas mixtures, with or without inhibitors. These correlations are applicable to temperatures up to 90 degrees F and pressures up to 12,000 psi. The results show an average absolute percentage deviation of 15.93 in pressure and an average absolute temperature difference of 2.97 degrees F.