An apparatus for controlling vehicle stability includes a pressure calculator calculating a brake pressure. In one embodiment, the calculated brake pressure is calculated based on a yaw rate signal input from a yaw rate sensor. In other embodiments, the calculated brake pressure is further calculated on the basis of signals input from a steering angle sensor, a lateral acceleration sensor, a vehicle speeds sensor, and a master brake pressure sensor. A method for controlling vehicle stability is also provided. The method and apparatus enhances stability and reliability during vehicle driving.