The Wallace Rule of Nines calculator computes the percent of a Body Surface Area that is burned based on the Wallace Rule of Nines. Burn Percentage
INSTRUCTIONS: Enter the following estimated percentages:
Percent BSA (%BSA): The calculator returns the percent of the burned Body Surface Area.
The Wallace Rule of Nines can be used to approximate the percent of a patient that is burned. It applies a percent of Body Surface Area, often a multiple of 9, for different body parts as follows:
If you compute the body surface area of a person using one of the standard body surface area methods (e.g. Takahira Body Surface Area) and get a BSA of 2 square meters, and then note that the patient’s skin issue (e.g. burn) is on half (50%) of his chest and all (100%) of an arm, you can use the Wallace Rule of Nine as follows:
This Wallace Rule of Nines Calculator makes the process simpler. In this example, you would enter 50% for the chest and 100% for the arm. The calculator would return 13.5%. That's the total estimate of the body surface area that is burned. You then multiply 13.5% times 2 square meters to get 0.27 square meters of burned skin.
Body Surface Area (BSA) is the measured or calculated surface area of a human body frequently used in physiology and medicine. For many clinical purposes BSA is a better indicator of metabolic mass than body weight because it is less affected by abnormal adipose mass. Estimation of BSA is simpler than many measures of volume.
Age Range | Male | Female |
---|---|---|
Neonate | 0.243 m² | 0.234 m² |
2 years old | 0.563 m² | 0.54 m² |
5 years old | 0.787 m² | 0.771 m² |
10 years old | 1.236 m² | 1.245 m² |
13 years old | 1.603 m² | 1.55 m² |
18 years old | 1.98 m² | 1.726 m² |
20 to 79 years old | 2.06 m² | 1.83 m² |
80 and above | 1.92 m² | 1.638 m² |
BSA Calculators vs Inputs | |||
Method | Height | Weight | Gender |
Mosteller | x | x | |
Gehan and George | x | x | |
Boyd | x | x | |
DuBois | x | x | |
Haycock | x | x | |
Fujimoto | x | x | |
Takahira | x | x | |
Schlick | x | x | x |
Costeff | x | ||
Wang Hihara | x | x |