WinPas is a flexible and easy to use feed formulation program for pigs, poultry, cattle, aquaculture, and other animal species. The main purpose of the program is to produce well balanced and optimized formulas for concentrates, protein concentrates, premixes and daily rations. Simple and friendly interface together with many sophisticated functions built-into the program make it a very good tool for feed producers, Extension Service advisors and animal farmers. It is also used by universities and schools as a good education tool.