A typical bar is about 40 inches to 42 inches tall. For such a bar height, a bar stool should be about 30 inches tall to the top of the seat. A raised breakfast bar in a kitchen or a bar-height table will require bar-height stools so that people can eat and drink comfortably.
Standard kitchen counters are 36 inches high. Counter-height bar stools are 24 inches to 26 inches high. These kinds of counter stools are perfect if you have a kitchen island or peninsula where you want people to be able to eat and gather. A bar-height stool would be too tall in this situation.