1Rule of Nines Calculator — Quick Reference
This burns calculator automatically adjusts TBSA (Total Body Surface Area) percentages based on the patient's age group. Children have proportionally larger heads and smaller legs compared to adults.
| Body Region | Adult % TBSA | Infant/Child % TBSA |
|---|---|---|
| Head & Neck | 9% | 18% (larger proportionally) |
| Anterior Trunk (Chest + Abdomen) | 18% | 18% |
| Posterior Trunk (Back) | 18% | 18% |
| Each Arm | 9% | 9% |
| Each Leg | 18% | 14% (smaller proportionally) |
| Genitalia | 1% | Not included |
| Total | 100% | 100% |
2Understanding the Parkland Burn Formula
Severe burns cause massive fluid shifts from the intravascular compartment into tissues due to increased capillary permeability — a process that begins within minutes of injury and peaks at approximately 8–12 hours. Without prompt intravenous fluid resuscitation, this leads to hypovolemic shock, end-organ failure, and death.
The Parkland equation (often referred to as the Parkland formula for burns), developed by Dr. Charles Baxter in the 1960s, provides a simple, evidence-based starting point for resuscitation in burns covering more than 15% TBSA in adults (or 10% in children).
The Calculation
The standard parkland burn formula is: 4 mL × weight (kg) × %TBSA. This gives the total crystalloid volume needed over 24 hours. Half of this volume is delivered in the first 8 hours from injury, and the second half over the remaining 16 hours. This front-loading reflects the peak capillary leak period in early burn injury.
Fluid Choice
Lactated Ringer's solution (also called Hartmann's solution) is universally preferred over normal saline. Large volumes of 0.9% saline cause hyperchloremic metabolic acidosis, which can complicate the already complex metabolic derangement in burn patients.
Titration — Urine Output is the Target
The Parkland formula calculator provides a starting estimate only. The fluid rate must be dynamically adjusted based on urine output, measured hourly via a catheter:
- Adults: target 0.5 mL/kg/hr
- Children: target 1 mL/kg/hr
- Oliguria → increase fluid rate; excessive output → decrease rate
- Hemoglobinuria (port-wine urine in electrical or chemical burns) → target higher output of 1–2 mL/kg/hr to protect kidneys
Burns Not Requiring Parkland Resuscitation
- Superficial (first-degree) burns — excluded from TBSA entirely
- Burns <15% TBSA in adults — oral rehydration generally sufficient
- Burns <10% TBSA in children — oral rehydration generally sufficient
- Burns to palms, ears, face (first degree only) — no systemic resuscitation needed
Pediatric Considerations
Children require modifications to the standard Rule of Nines due to differing body proportions. The Lund and Browder chart provides the most accurate TBSA estimate for pediatric patients. Additionally, young children often receive maintenance dextrose-containing fluids alongside their Parkland volume to prevent hypoglycemia, which adults do not routinely need.
3Frequently Asked Questions
The Parkland formula provides an essential baseline for 24-hour crystalloid resuscitation in significant thermal injuries, but fluid rates must be continuously titrated against hourly urine output.