The normal doorway height is 80 inches for both exterior and interior entrances. In the construction sector, this is commonly expressed as 6/8, which translates to 6 feet, 8 inches. Although this is the typical height, real door openings might be somewhat less or bigger, such as 79 or 81 inches. There are several factors that go into determining doorway height, including room size, architecture, style, and decor. For example, smaller rooms might have openings that are lower than usual to allow more light into the space. In the United States, the average height of men is 69 inches and the average height of women is 63 inches. As a result, most doors are designed to accommodate someone who is around 69 inches tall. However, there are some people who might be shorter or taller than this. A person who is between 66 and 70 inches tall will need a doorway that is 72 inches high or higher to avoid hitting one's head when opening or closing the door. Children tend to grow faster than adults do, so children's doorways usually are 73 inches or higher. As adults get heavier, they need doorways that are 74 inches or higher to avoid hitting their heads when opening or closing doors. People who are over 7 feet tall should use caution not to bump their heads when opening or closing doors because doors typically are only 78 inches high.