Rule of Nine Formula

Rule of Nine Formula
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.

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