Rule of nines for burns

Body divided into areas showing percentages of surface area

The size of a burn can be quickly estimated by using the "rule of nines." This method divides the body's surface area into percentages.

  • The front and back of the head and neck equal 9% of the body's surface area.
  • The front and back of each arm and hand equal 9% of the body's surface area.
  • The chest equals 9% and the stomach equals 9% of the body's surface area.
  • The upper back equals 9% and the lower back equals 9% of the body's surface area.
  • The front and back of each leg and foot equal 18% of the body's surface area.
  • The genital area equals 1% of the body's surface area.

Current as of: November 16, 2023

Author: Healthwise Staff
Clinical Review Board
All Healthwise education is reviewed by a team that includes physicians, nurses, advanced practitioners, registered dieticians, and other healthcare professionals.

 
 

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