It can be used to measure the congestion and population density of an area or place. The formula for calculating the entrance rate is: entrance rate = number of people entering / area of the area or place. By calculating the entrance rate, it is possible to understand the flow of people in an area or place. A higher entrance rate indicates that the area or place is being watched and visited by more people and is a busy place. A lower entrance rate indicates that the area or place is less attractive and has relatively less foot traffic.