The Rule of Nines divides the adult body into regions of approximately 9% total body surface area (TBSA) to quickly estimate burn extent for fluid resuscitation calculations.
Select Burned Areas (Partial/Full Thickness Only)
How to Use the Burn Area Calculator
This burn area calculator uses the Rule of Nines to estimate total body surface area (TBSA) burned and calculates Parkland formula fluid requirements. Select each body region with partial or full-thickness burns, then enter the patient's weight for fluid calculations.
Important Notes on Burn Classification
Only include partial-thickness (second-degree) and full-thickness (third-degree) burns. Superficial (first-degree) burns — like minor sunburns — are not included in TBSA calculations and do not factor into resuscitation needs. The Lund-Browder chart is preferred over the Rule of Nines for pediatric patients due to proportional body differences in children.
Frequently Asked Questions
Is this burn area calculator free?
Yes, completely free with no signup required. Always confirm calculations with a burn specialist.
What is the Rule of Nines?
The Rule of Nines divides the adult body into regions, each representing approximately 9% of total body surface area (TBSA): head/neck 9%, each arm 9%, chest 9%, abdomen 9%, upper back 9%, lower back 9%, each thigh 9%, each lower leg 9%, and genitalia 1%.
How is fluid resuscitation calculated for burns?
The Parkland formula: 4 mL × weight (kg) × %TBSA burned of Lactated Ringer's solution over 24 hours. Half is given in the first 8 hours from time of burn, the rest over the following 16 hours.
Is the Rule of Nines different for children?
Yes. Children have proportionally larger heads and smaller legs than adults. The Lund and Browder chart is more accurate for pediatric burns. This calculator uses adult proportions.
What burn depth is included in TBSA calculations?
Only partial-thickness (second-degree) and full-thickness (third-degree) burns are included in TBSA for fluid resuscitation purposes. Superficial (first-degree) burns are not counted.