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 sections 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:

• Head — 9% of TBSA
• Each Arm — 9% of TBSA
• Each Leg — 18% of TBSA
• Front Torso — 18% of TBSA
• Back Torso — 18% of TBSA
• Genitals — 1% of TBSA

Explanation: The percentages are added together based on which body regions are affected by burns.

3. Importance of Burn Percentage Calculation

Details: Accurate burn percentage estimation is crucial for determining fluid resuscitation needs, prognosis, and treatment planning. Burns covering more than 20% TBSA typically require hospitalization.

4. Using the Calculator

Tips: Check all body regions that have burns. The calculator will sum the percentages for the selected regions. For partial burns in a region, clinicians often estimate the percentage of the region affected.

5. Frequently Asked Questions (FAQ)

Q1: How does the Rule of Nines differ for children?
A: Children have proportionally larger heads (up to 18% in infants) and smaller legs. Special pediatric charts should be used.

Q2: What about burns that don't cover a whole region?
A: For partial burns, the palm method (patient's palm = ~1% TBSA) can estimate smaller areas.

Q3: Why is burn percentage important?
A: It guides fluid resuscitation (Parkland formula: 4mL × %TBSA × kg), determines need for transfer to burn center, and predicts complications.

Q4: Are there limitations to the Rule of Nines?
A: It's less accurate for obese patients and doesn't account for varying burn depths. Clinical judgment is always needed.

Q5: When should I use the Rule of Nines vs. Lund-Browder chart?
A: Rule of Nines is for quick initial estimation. Lund-Browder is more accurate, especially for children, but requires more detailed measurement.