Parkland Formula Calculator
Determine fluid resuscitation requirements in milliliters (mL) for the first 24 hours of burn management.
Resuscitation Volume Requirements
Formula Used
💡 Resuscitation Rule: Give 50% of the total calculated volume over the first 8 hours (starting from the *time of the burn injury*, not when the patient arrived at the clinic), and the remaining 50% over the next 16 hours. Lactated Ringer's (LR) is typically the fluid of choice.
Terms Used
- TBSA Burned Percentage: Total percentage of body surface area affected by second or third-degree burns (estimated using the Rule of Nines).
- First 8 Hours Volume: Fluid volume to administer over the initial 8 hours from the time of injury (mL).
- Remaining 16 Hours Volume: Fluid volume to administer over the subsequent 16 hours (mL).
What is the Parkland Formula?
Pathophysiology of Burns & Fluid Shifts
Major burn injuries (typically defined as second or third-degree burns covering more than 15% to 20% of Total Body Surface Area) trigger a profound systemic inflammatory response known as **Burn Shock**. Within hours of the thermal insult, cellular damage and inflammatory mediators (like histamines, prostaglandins, and cytokines) cause widespread endothelial dysfunction. This leads to a dramatic increase in capillary permeability throughout the vascular system, not just at the site of the burn.
As a result, plasma fluid, electrolytes, and low-molecular-weight proteins leak out of the vascular space and into the interstitial tissues. This phenomenon is commonly called **third-spacing**. Simultaneously, cellular edema occurs as sodium pumps fail, causing cells to swell. The loss of intravascular volume leads to severe hypovolemia, hemoconcentration, and arterial hypotension. This decrease in cardiac output impairs oxygen delivery to tissues and vital organs. Without prompt, aggressive fluid resuscitation, the patient will develop hypovolemic shock, renal failure, and multi-organ dysfunction syndrome (MODS).
Fluid resuscitation aims to maintain intravascular volume and support organ perfusion during the first 24 hours post-burn, when capillary leakage is most severe. Resuscitation must balance maintaining blood flow with avoiding volume overload, which can lead to abdominal compartment syndrome, pulmonary edema, or severe chest wall restriction.
The Parkland Formula Resuscitation Schedule
The Parkland Formula calculates the total volume of crystalloid fluid (typically Lactated Ringer's) needed in the first 24 hours after a burn injury. The formula is:
Where TBSA is entered as a whole number percentage (e.g., 30% is entered as 30, not 0.30). Only second-degree (partial thickness) and third-degree (full thickness) burns are included in the TBSA calculation. First-degree burns (like mild sunburns) are excluded because they do not cause significant capillary leakage.
The 8-Hour / 16-Hour Fluid Schedule
The calculated volume is administered on a strict clinical timeline:
• First 8 Hours (50% of volume): Administer half of the total volume over the first 8 hours. CRITICAL NOTE: This 8-hour window begins from the *time of the burn injury*, not when the patient arrives at the emergency department. If a patient is burned at 12:00 PM but arrives at the hospital at 2:00 PM, the first half of the fluid must be infused over the remaining 6 hours of the window.
• Next 16 Hours (50% of volume): Administer the second half of the calculated fluid over the remaining 16 hours of the first day.
Lactated Ringer's (LR) is the preferred resuscitation fluid. Unlike Normal Saline, which can cause hyperchloremic metabolic acidosis when given in large volumes, LR contains sodium, chloride, potassium, calcium, and lactate. The liver metabolizes lactate into bicarbonate, which helps buffer systemic acidosis and matches normal blood pH more closely.
5 Detailed Clinical Worked Examples
Example 1: Standard Adult Resuscitation
Clinical Scenario: A 70 kg adult patient presents with second and third-degree burns covering 30% TBSA. The injury occurred 1 hour prior to arrival.
- Step 1: Calculate total 24-hour volume.
Total Volume = 4 mL * 70 kg * 30 = 8,400 mL. - Step 2: Calculate the 8-hour and 16-hour distribution.
First 8 hours (50%): 8,400 / 2 = 4,200 mL.
Next 16 hours (50%): 4,200 mL. - Step 3: Determine the infusion rates.
Because the patient arrived 1 hour after the injury, the first 4,200 mL must be infused over the remaining 7 hours of the initial 8-hour window:
Infusion Rate (first 8h) = 4,200 mL / 7 hours = 600 mL/hour.
Infusion Rate (next 16h) = 4,200 mL / 16 hours = 262.5 mL/hour. - Clinical Answer: Infuse Lactated Ringer's at 600 mL/h for the first 7 hours, then adjust to 262.5 mL/h for the next 16 hours.
Example 2: Small Area Burn Resuscitation
Clinical Scenario: A 60 kg patient has partial-thickness burns on their chest and arms, estimated at 15% TBSA. The patient arrives immediately after the burn.
- Step 1: Calculate total volume.
Total Volume = 4 mL * 60 kg * 15 = 3,600 mL. - Step 2: Calculate the distribution.
First 8 hours (50%): 3,600 / 2 = 1,800 mL.
Next 16 hours (50%): 1,800 mL. - Step 3: Calculate the hourly pump rates.
Rate for first 8 hours: 1,800 mL / 8 hours = 225 mL/hour.
Rate for next 16 hours: 1,800 mL / 16 hours = 112.5 mL/hour. - Clinical Answer: Infuse LR at 225 mL/h for 8 hours, then at 112.5 mL/h for the next 16 hours.
Example 3: Severe Burn Resuscitation
Clinical Scenario: A 100 kg adult patient is admitted with third-degree burns covering 50% TBSA. The injury occurred 2 hours prior to hospital arrival.
- Step 1: Calculate total volume.
Total Volume = 4 mL * 100 kg * 50 = 20,000 mL (20 Liters). - Step 2: Calculate the distribution.
First 8 hours (50%): 20,000 / 2 = 10,000 mL.
Next 16 hours (50%): 10,000 mL. - Step 3: Adjust rate for time elapsed.
Because 2 hours have passed since the injury, the first 10,000 mL must be infused over the remaining 6 hours of the initial 8-hour window:
Infusion Rate (first 8h) = 10,000 mL / 6 hours = 1666.667 mL/hour.
Infusion Rate (next 16h) = 10,000 mL / 16 hours = 625 mL/hour. - Clinical Answer: Program the pump at 1,666.667 mL/h for the first 6 hours, then reduce to 625 mL/h.
Example 4: Moderate Area Burn Resuscitation
Clinical Scenario: An 80 kg adult is admitted with partial-thickness burns on their back and posterior legs, estimated at 40% TBSA. The patient arrives immediately after the burn.
- Step 1: Calculate total volume.
Total Volume = 4 mL * 80 kg * 40 = 12,800 mL. - Step 2: Calculate the distribution.
First 8 hours (50%): 12,800 / 2 = 6,400 mL.
Next 16 hours (50%): 6,400 mL. - Step 3: Determine the hourly pump rates.
Rate for first 8 hours: 6,400 mL / 8 hours = 800 mL/hour.
Rate for next 16 hours: 6,400 mL / 16 hours = 400 mL/hour. - Clinical Answer: Infuse LR at 800 mL/h for 8 hours, then at 400 mL/h for the next 16 hours.
Example 5: Minor Area Burn Resuscitation
Clinical Scenario: A 50 kg adult is admitted with second-degree burns covering 25% TBSA. The patient arrives immediately after the burn.
- Step 1: Calculate total volume.
Total Volume = 4 mL * 50 kg * 25 = 5,000 mL. - Step 2: Calculate the distribution.
First 8 hours (50%): 5,000 / 2 = 2,500 mL.
Next 16 hours (50%): 2,500 mL. - Step 3: Determine the hourly pump rates.
Rate for first 8 hours: 2,500 mL / 8 hours = 312.5 mL/hour.
Rate for next 16 hours: 2,500 mL / 16 hours = 156.25 mL/hour. - Clinical Answer: Infuse LR at 312.5 mL/h for 8 hours, then at 156.25 mL/h for the next 16 hours.
Frequently Asked Questions (Clinical & Exam Prep)
Why does the 8-hour fluid administration window start from the time of injury rather than hospital arrival?
Endothelial dysfunction and capillary leakage begin immediately after the thermal insult, and fluid shifting is most rapid during the first few hours. Starting the timeline from the time of injury ensures the patient receives the necessary volume when the physiological need is highest, preventing early organ hypoperfusion.
How do clinicians monitor the effectiveness of fluid resuscitation?
Urine output is the primary indicator of organ perfusion. In adults, the target urine output is 0.5 to 1.0 mL/kg/h (or approximately 30 to 50 mL/h). For electrical or chemical burns, the target is higher (75 to 100 mL/h) to clear myoglobin and prevent renal tubular necrosis.
Why is Lactated Ringer's preferred over Normal Saline for burns?
Lactated Ringer's has an osmolarity and electrolyte profile that closely match human plasma. Infusing large volumes of Normal Saline (0.9% NaCl) introduces excess chloride, which can cause hyperchloremic metabolic acidosis. Bicarbonate produced from lactate metabolism in LR also helps buffer systemic acidosis.
What is the Rule of Nines and how is it used?
The Rule of Nines is a rapid clinical assessment tool used to estimate TBSA burned. The body is divided into anatomical sections representing 9% (or multiples of 9%): head (9%), chest (9%), abdomen (9%), upper back (9%), lower back (9%), each arm (9%), each leg (18%), and the perineum (1%).
Are first-degree burns included in the TBSA calculation?
No. First-degree burns (like mild sunburns) involve only the epidermis. They cause local redness and pain but do not damage the vascular barrier or cause the systemic fluid shifting seen in partial or full-thickness burns.
What is "fluid creep"?
Fluid creep refers to the administration of resuscitation fluid volumes significantly exceeding those calculated by formulas. This often happens when clinicians increase infusion rates in response to transient drops in urine output or blood pressure, which can lead to complications like compartment syndrome.
How do fluid resuscitation requirements change in the second 24 hours?
In the second 24 hours, capillary permeability begins to normalize, and third-spacing slows. The infusion of crystalloids is typically reduced, and colloids (like 5% albumin) may be introduced to draw fluid back into the vascular space, along with maintenance dextrose solutions.
What are the resuscitation fluid requirements for pediatric patients with burns?
Children have a larger body surface area relative to their weight and smaller glycogen reserves. Consequently, pediatric burn resuscitation requires adding maintenance fluids containing dextrose (calculated using the Holiday-Segar method) alongside the Parkland formula fluids to prevent hypoglycemia.
We try our best to make our clinical calculators as precise and reliable as possible. However, the calculation output is for informational and educational purposes only and should not serve as a substitute for professional medical consultation, diagnosis, or patient treatment. Licensed healthcare practitioners must independently verify all dosage rates and drug parameters before initiating patient care.