Capillary pressure is valuable for petroleum exploration and development. Therefore, several models were developed for up –scaling capillary pressure. Four models were reviewed and applied them for two separate- sandstone reservoirs in the southern Gulf of Suez, Egypt. The two reservoirs show various degree of heterogeneity increased in the pre- Cenomanian one. Most of the models give reasonable results for monomodal and bimodal pore size systems. However, the up – scaling models failed to describe and correlate the trimodal pore size system. Several modifications were applied for the models in order to be adequate for the studied reservoirs. Also many equations were developed to describe the relations between the parameters included in the up- scaling capillary pressure models and the available petrophysical parameters; permeability and porosity