Typically, a city block measures 311 feet in length. The length differs depending on the city and street.
Typically, engineers estimate that one city block equals 100,000 square feet. It is estimated that one mile contains 16 or 17 city blocks. These are conventional estimates, however the actual amount varies every city.
One block between avenues in New York City, for example, is normally the size of three city blocks. Some can reach 920 feet in length, while the average length is approximately 750 feet. The most accurate technique to determine the length of a city block is to walk it while keeping track of your pace.