In the adult Rule of Nines, which percentage is assigned to the torso?

• A. 9%
• B. 13.5%
• C. 27%
• D. 18%

Answer: (D)

The Rule of Nines is a quick way to estimate burn size in adults by dividing the body into regions that each represent multiples of 9% of surface area. The torso, specifically the anterior trunk, accounts for 18% of the body's surface area. The back is a separate 18% region, so the entire trunk (front plus back) totals 36%. So when the question asks about the torso, the correct single-region value is 18% for the anterior trunk. The head and neck are 9%, and there isn’t a standard 13.5% or 27% single-region in this rule, making 18% the correct choice for the torso.