What percentage of body surface area (BSA) does the head account for in adults?

In adults, the head typically accounts for approximately 9% of total body surface area (BSA). This is derived from the Rule of Nines, a quick method used primarily in the context of burn assessment, which helps estimate the extent of burns as a percentage of total body area.

According to this rule, the body is divided into sections, each representing a specific percentage of BSA. The head is assigned 9%, reflecting its proportion relative to the entire body. This classification is particularly useful in emergency medicine, allowing healthcare providers to make rapid assessments in trauma or burn situations.

While other regions of the body have their designated percentages, such as the torso and limbs, the figure for the head is consistently noted as 9% in adults.