How do you use the formula rule of nine?

The Rule of Nines is a method used in assessing burn surface area in adults. The body is divided into sections, each representing approximately 9% (or multiples of 9%) of the total body surface area (TBSA). For example, the head and neck account for 9%, each arm for 9%, each leg for 18%, the anterior torso for 18%, and the posterior torso for 18%. This quick estimation helps guide treatment decisions, including fluid resuscitation needs.