RULE OF NINE in BURNS

Head and neck 9%

Anterior trunk 18%

Posterior trunk 18%

Arms (9%) 18%

Legs (18%) 36%

Perineum 1%

example: 

1. 1 leg and 1 arm burned, 18 + 9 = 27% 
2. the patient has a burned chest and both his arms, 18 + 18 = 36%