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`BSA % = "Wallace Rule of Nines"`

Enter a value for all fields

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:

- (
**H**) % of the**head**burned. - (
**LA**) % of the**left arm**burned. - (
**RA**) % of the**right arm**burned. - (
**C**) % of the**chest**burned. - (
**A**) % of the**abdomen**burned. - (
**B**) % of the**back**burned. - (
**G**) % of the**groin**burned. - (
**LL**) % of the**left leg**burned. - (
**RL**) % of the**right leg**burned.

**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:

- (9%) Entire head
- (9%) Complete left arm
- (9%) Complete right arm
- (9%) Entire chest
- (9%) Entire abdomen
- (18%) Complete back
- (1%) Groin
- (18%) Complete left leg
- (18%) Complete right leg

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:

- Burn Area on Chest = 50% * 9% * 2 square meters = 0.09 square meters
- Burn Area on Arm = 100% * 9% * 2 square meters = 0.18 square meters
- Total Burn Area = 0.09 + 0.18 = 0.27 square meters of skin

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 |
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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 |

- Mosteller formula Body Surface Area Calculator
- Gehan and George formula Body Surface Area Calculator
- Boyd formula Body Surface Area Calculator
- DuBois formula Body Surface Area Calculator
- Haycock formula Body Surface Area Calculator
- Fujimoto formula Body Surface Area Calculator
- Takahira formula Body Surface Area Calculator
- Costeff formula Body Surface Area Calculator
- Wang Hihara Body Surface Area Calculator
- Schlick Body Surface Area Calculator
- Body Surface Area Comparison with Averages

- The BSA Compare function lets you enter a body surface area and choose a demographic (above) to compute the percent compared to the mean.
- Wallace Rule of Nines: This computes a percentage of the human body for burn victims based on percentages allocated to different body parts.
- Rule of Fives: This computes a percentage of the human body for obese burn victims.
- Parkland Replacement Fluid: This compute the volume of replacement fluids needed in the first 24 hours based on the patients weight (mass) and the percent of their body that has been burned.
- BSA Percent: This computes a body surface area based on the total body surface area and a percent..

- Image of Human Body from OpenStax College. Used through CC 3.0. Source Anatomy & Physiology, Connexions Web site. http://cnx.org/content/col11496/1.6/, Jun 19, 2013.