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# Wallace Rule of Nines

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.

**Related Calculators**:

- To compute the Replacement Fluid Requirement for a burn victim using the Parkland Formula, CLICK HERE.
- Compute the Body Surface Area using the following methods:

### Burn 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

##### Example

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 patientâ€™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.

##### References:

- 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.

##### Dedication: For Scout.

**Wallace Rule of Nines**, is used in 1 calculator.

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