Fill in the Blanks Burns: Rule of NinesOnline version This game will help retain information about the rule of nines with burns by Leah Lloyd 1 9% 9% rule 1% 18% 9 degree surface nines depth area percentage 18% severity Burns are classified as first , second , or third according to their or . The treatment of burns depends on the amount of that is damaged . For this reason , it is helpful to be able to estimate quickly the amount of surface area that is burned . One easy method for making a quick estimate is called the of . In this method , each body region constitutes a of the total that is some multiple of . Each upper limb is of the total body surface area ; each lower limb is ; the anterior and posterior trunk regions are each ; the head and neck together make up and the perineum is the final .