Wallace's Rule of Nines provides a quick, approximation of the area of skin burnt. Arbitrarily, it divides the body up into units of surface area divisible by nine - with the exception of the perineum. Usually, charts of area are available in most burns units.
In an adult, the following are the respective percentages of the total body surface area:
The Rule of Nines is relatively accurate for adults but not for children due to the relative disproportion of body part surface area - see submenu.
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