1. What is the Rule of Nines?

The Rule of Nines is a method used to estimate the total body surface area (TBSA) affected by burns. It divides the body into regions that represent 9% or multiples of 9% of the total body surface area.

2. How Does the Calculator Work?

The calculator uses the Rule of Nines formula:

Where each body region contributes:

• Head: 9%
• Each arm: 9%
• Each leg: 18%
• Front torso: 18%
• Back torso: 18%
• Genitals: 1%

Explanation: The percentages are added together to calculate the total burned surface area.

3. Importance of %TBSA Calculation

Details: Accurate %TBSA calculation is crucial for determining burn severity, guiding fluid resuscitation, and making decisions about patient transfer to burn centers.

4. Using the Calculator

Tips: Check all body regions that are affected by burns. The calculator will sum the percentages for the selected regions.

5. Frequently Asked Questions (FAQ)

Q1: How does this differ for children?
A: Children have proportionally larger heads and smaller legs - modified percentages are used in pediatric cases.

Q2: What about partial thickness burns?
A: Only areas with at least partial thickness (second degree) burns should be included in the calculation.

Q3: When is the Rule of Nines not accurate?
A: For scattered burns or irregular burn patterns, the palm method (patient's palm = 1% BSA) may be more accurate.

Q4: What %TBSA requires hospital admission?
A: Generally >10% in children or elderly, >15% in adults, or any full-thickness burns >5%.

Q5: How does this affect fluid resuscitation?
A: The Parkland formula uses %TBSA to calculate fluid requirements (4mL × %TBSA × kg body weight in first 24 hours).