Final answer:
Armchair dimensions typically used to follow a rule of thumb: 5 diameters wide by 7-8 diameters deep, but more contemporary recommendations suggest up to 8 diameters wide and 15 diameters deep. The term 'diameter' relates to the average human body size for appropriate scaling. It's essential to specify the unit of measurement for clarity.
Step-by-step explanation:
The typical armchair dimensions in terms of width and depth can vary, but conventional standards suggest a rule of thumb that has altered over time. Traditionally, an armchair was designed to be about 5 diameters wide by 7-8 diameters deep. However, based on newer ergonomic research, some suggest that a more comfortable sizing might be around 8 diameters wide and 15 diameters deep. The diameter here typically refers to the average human body size, ensuring a suitable fit and comfort level for most users.
For example, if we consider the average width of a human body to be around 15 to 18 inches, an armchair with a width of 8 diameters would range from 120 to 144 inches wide, which may not be practical for residential furniture. Thus, the original measurement of 5 diameters wide makes more sense and would be approximately 75 to 90 inches wide - a more suitable dimension for home use. Similarly, an armchair's depth of 7 to 8 diameters deep, using the same average human body width, would translate to a depth of approximately 105 to 144 inches deep, considering more recent research suggestions of 15 diameters, this would make much deeper seats that could range up to 225 inches deep.
It's critical to remember that such a 'rule of thumb' must account for the practicality of the furniture's dimensions within the intended space, as well as the necessity of providing the exact units of measurement when specifying the size (for example, specifying inches or centimeters).