Wallace Race Calculator – Calculator City

What is the Wallace Race Calculator?

The wallace race calculator, more formally known as the Wallace Rule of Nines, is a critical medical tool used to quickly and effectively estimate the total body surface area (TBSA) affected by a burn in adults. Despite the “race” in the name, which may be a common misnomer, this calculator has nothing to do with automotive or track racing. It was popularized by Dr. A.B. Wallace in 1951 as a method for emergency medical responders and clinicians to rapidly assess burn extent, which is a vital first step in guiding treatment, particularly fluid resuscitation.

This tool is not intended for superficial (1st-degree) burns but is essential for assessing partial-thickness (2nd-degree) and full-thickness (3rd-degree) burns. An accurate TBSA estimation using a reliable TBSA calculator is fundamental for calculating fluid needs, often with the Parkland formula, and determining if a patient needs to be transferred to a specialized burn unit.

The Wallace Race Calculator Formula and Explanation

The “formula” behind the Wallace Rule of Nines is a simple division of the adult body into regions, each assigned a percentage that is a multiple of nine. This method allows for a swift calculation of the TBSA percentage during high-pressure emergency situations.

Variables Table

Variables used in the Wallace Rule of Nines for TBSA calculation.
Variable (Body Part)	Meaning	Unit (% of TBSA)	Typical Range
Head and Neck	Entire head, including face and neck.	9%	Can be subdivided (e.g., 4.5% anterior).
Anterior Torso	The entire front of the trunk (chest and abdomen).	18%	–
Posterior Torso	The entire back of the trunk (upper and lower back).	18%	–
Each Arm	A single, entire arm (left or right).	9%	Can be subdivided (e.g., 4.5% anterior).
Each Leg	A single, entire leg (left or right).	18%	Can be subdivided (e.g., 9% anterior).
Genitalia	The perineal region.	1%	–

Practical Examples

Example 1: Burn on Arm and Chest

Inputs: The patient has full-thickness burns covering their entire right arm and the front of their chest.
Units: Using the wallace race calculator, you would select “Right Arm” (9%) and the anterior part of the torso (18%). However, since the torso is split into chest and abdomen, we’d use 9% for the chest.
Results: The calculation would be 9% (Right Arm) + 9% (Chest) = 18% TBSA.

Example 2: Extensive Leg and Back Burn

Inputs: A patient has partial-thickness burns covering their entire left leg and their entire back.
Units: In the calculator, you would select “Left Leg” (18%) and “Posterior Torso” (18%).
Results: The total estimated burn area is 18% + 18% = 36% TBSA. This is a significant burn requiring immediate medical attention and likely a referral to a specialized burn care facility.

How to Use This Wallace Race Calculator

Using this online TBSA calculator is straightforward, designed for speed and accuracy.

Assess the Patient: Visually determine which parts of the patient’s body are affected by partial or full-thickness burns. Ignore simple redness (superficial burns).
Select Affected Areas: Check the boxes corresponding to the burned areas. You can either select a whole limb/region (e.g., “Left Arm”) or be more specific by selecting the anterior/posterior sub-parts. The calculator handles the logic automatically.
Interpret the Results: The calculator instantly provides the Total Body Surface Area (TBSA) percentage. The primary result shows the total, while the breakdown lists the specific areas you selected.
Analyze the Chart: The dynamic bar chart visually represents how much each selected body part contributes to the total TBSA, offering a quick visual confirmation.
Copy or Reset: Use the “Copy Results” button to save the TBSA total and breakdown to your clipboard for documentation. Use “Reset” to clear all selections for a new assessment.

Key Factors That Affect Burn Assessment

While the wallace race calculator provides a TBSA percentage, several other factors are critical for overall patient management:

Burn Depth: Classifying burns as partial-thickness or full-thickness is crucial. Deeper burns carry higher risks of complications.
Patient Age: The Rule of Nines is most accurate for adults. Children have different body proportions (larger heads, smaller legs), requiring a different chart like the Lund-Browder chart. See our guide on pediatric burn assessment for more info.
Inhalation Injury: Burns occurring in enclosed spaces or involving the face and neck raise suspicion of inhalation injury, which significantly increases mortality.
Associated Trauma: Always assess for other injuries that may have occurred at the same time as the burn.
Location of Burn: Burns on the hands, feet, face, or perineum are considered more severe and often require specialized care.
Pre-existing Medical Conditions: Patients with conditions like diabetes or heart disease may have a more complicated recovery course.

Frequently Asked Questions (FAQ)

1. Why is it called the Wallace “Race” Calculator?: The term “race” is likely a misnomer or a typo that has gained some traction. The correct medical term is the “Wallace Rule of Nines,” named after the surgeon who popularized it. There are, however, “Wallace Racing Calculators” for automotive drag racing, which are entirely different and cause this confusion.
2. Is the Rule of Nines 100% accurate?: No, it is an estimation tool designed for speed in emergencies. For a more precise measurement, especially in pediatric patients or for follow-up assessments, the Lund-Browder chart is considered the gold standard.
3. Should I include 1st-degree burns (redness) in the calculation?: No. The TBSA calculation for fluid resuscitation and critical care purposes should only include partial-thickness (2nd-degree) and full-thickness (3rd-degree) burns.
4. What is the Palmar Method?: For small or scattered burns, the Palmar Method can be used. The surface area of the patient’s palm (including fingers) is estimated to be approximately 1% of their TBSA.
5. How does this relate to the Parkland Formula?: The TBSA percentage derived from this burn percentage calculator is a direct input for the Parkland formula, which calculates the amount of intravenous fluid a patient needs over the first 24 hours. Check our Parkland formula calculator for the next step.
6. Can I use this calculator for children?: This specific calculator is configured for the adult Rule of Nines. Children’s body proportions are different, and a specialized pediatric chart should be used for accurate assessment.
7. What does TBSA stand for?: TBSA stands for Total Body Surface Area. It’s the standard unit for measuring the size of a burn.
8. Does the calculator handle overlapping selections?: Yes. If you select a sub-part (e.g., “Anterior Left Arm”) and also the main part (“Left Arm”), the logic is designed to prevent double-counting and use the most encompassing selection.

Related Tools and Internal Resources

For a comprehensive approach to burn care and emergency medicine, explore our other specialized resources:

Parkland Formula Calculator: Calculate fluid resuscitation needs based on TBSA.
Burn Care Guide: An in-depth guide to managing different types of burns.
Fluid Resuscitation Protocol: Detailed protocols for IV fluid management in critical care.
Pediatric Burn Assessment: Learn how to use the Lund-Browder chart for children.
TBSA Chart for Nurses: Printable charts and guides for clinical use.
Emergency Medicine Calculators: A suite of tools for various emergency scenarios.

Wallace Race Calculator (Rule of Nines)