In an adult who has been burned, the percent of the body involved can be calculated as follows: If both legs (18% x 2 = 36%), the groin (1%) and the front chest and abdomen were burned, this would involve 55% of the body.
The "rule of nines" can be used to rapidly determine the size of a burn. The surface area of the body is divided using this method into percentages. 9% of the surface area of the body is made up of the front and back of the head and neck. Each arm and hand's front and back together make up 9% of the body's surface area.
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