Parkland Formula for Burns

Learn how the Parkland Formula calculator estimates initial burn resuscitation fluids using body weight and %TBSA, including timing, hourly rates, and clinical interpretation.

Parkland Formula for Burns

Estimates isotonic crystalloid for the first 24 hours after injury. Adults: 4 mL × kg × % TBSA. Children: 3 mL × kg × % TBSA for the burn portion plus Holliday-Segar maintenance. Half of the burn resuscitation volume is usually given in the first 8 hours from the time of burn; the remainder over the next 16 hours.

Patient type

Weight (kg)

TBSA burned (%)

Use % total body surface area with second- and third-degree burns only, per standard teaching.

Disclaimer: This calculator is for education only. Burn resuscitation requires ongoing reassessment and specialist protocols; it does not replace burn center or emergency care.

Parkland Formula Explained

Adults

Total crystalloid (first 24 h) = 4 mL × weight (kg) × % TBSA burned

TBSA in standard teaching includes partial-thickness (second-degree) and full-thickness (third-degree) involvement. Half of this volume is often infused in the first 8 hours from the time of burn; the remaining half over the following 16 hours. Lactated Ringer's is commonly used.

Children

Burn-related crystalloid is often estimated as 3 mL × kg × % TBSA over the same 24-hour period, with the same 8-hour / 16-hour split for that portion. Maintenance fluids are added using a weight-based rule such as Holliday-Segar over 24 hours; delivery alongside resuscitation follows pediatric burn center practice.

Holliday-Segar (24 h)

First 10 kg: 100 mL/kg
Next 10 kg: 50 mL/kg
Each kg above 20 kg: 20 mL/kg

Worked example (adult)

70 kg, 25% TBSA: 4 × 70 × 25 = 7,000 mL in 24 hours. First 8 hours: 3,500 mL (~438 mL/h average); next 16 hours: 3,500 mL (~219 mL/h average).

Clinical notes

Resuscitation is titrated to urine output, mental status, and perfusion, not fixed rates alone.
Electrical injury, inhalation injury, delayed resuscitation, and comorbidities may require adjustment.
Formal TBSA estimation may use Rule of Nines, Lund-Browder, or mapping; this calculator only multiplies the % you enter.

Similar clinical reference: MDCalc Parkland Formula for Burns.

Limitations

Does not model colloid, albumin, or hypertonic strategies used in some protocols.
Pediatric maintenance and combined infusions vary by center; always follow local guidelines.
Not for isolated inhalation injury without cutaneous burns unless your protocol defines TBSA differently.

Parkland Formula for Burns

The Parkland Formula is one of the best-known methods used to estimate initial fluid resuscitation requirements for patients with significant burn injuries. In burn care, fluid shifts can be severe during the early hours after injury. Large burns increase capillary permeability and lead to major loss of fluid from the intravascular space into the interstitial tissues. If this is not managed appropriately, the patient may develop burn shock, poor tissue perfusion, kidney injury, worsening organ dysfunction, and increased risk of death.

A Parkland Formula calculator helps clinicians quickly estimate how much intravenous crystalloid fluid should be given during the first 24 hours after a major burn. The formula is not a complete treatment plan by itself. It is a starting point for resuscitation, and the actual fluid rate must then be adjusted based on the patient’s clinical response, urine output, hemodynamics, and overall perfusion status.

What the Parkland Formula Measures

The Parkland Formula estimates the initial volume of resuscitation fluid required in the first 24 hours after a burn injury. It is primarily used for patients with moderate to major burns who need formal burn resuscitation rather than simple oral hydration or routine maintenance fluids.

The formula does not diagnose burn severity by itself, and it does not determine every detail of burn management. Instead, it gives an organized starting estimate of how much intravenous fluid should be administered early after injury to reduce the risk of under-resuscitation.

The Standard Parkland Formula

The classic Parkland Formula is:

4 mL × body weight in kg × % total body surface area (TBSA) burned

This calculated volume represents the total amount of Lactated Ringer’s solution to be given over the first 24 hours from the time of burn injury.

The timing is traditionally divided as follows:

First half of the total calculated volume is given in the first 8 hours from the time of injury
Second half is given over the next 16 hours

This timing is very important. The clock starts at the moment of the burn, not at the time the patient reaches the emergency department. If the patient presents late, the remaining volume for the first 8-hour period must be given over the time that is left, not restarted from zero.

Why Fluid Resuscitation Is Needed After Burns

Burn injuries can produce a profound inflammatory response. In larger burns, the damaged tissues release mediators that increase vascular permeability. This allows fluid, electrolytes, and proteins to leave the blood vessels and move into surrounding tissues. The result can be significant intravascular depletion even when the patient appears swollen externally.

The main goals of early burn fluid resuscitation are to:

Maintain effective circulation
Preserve organ perfusion
Support kidney function
Reduce burn shock
Prevent complications of severe hypovolemia

The Parkland Formula provides a structured way to begin that resuscitation process.

Variables Needed for the Formula

A Parkland Formula calculator requires two main inputs:

Body weight in kilograms
Percentage of total body surface area burned (%TBSA)

Only the burned area that is considered clinically relevant for formal burn resuscitation should be included. Superficial erythema alone is generally not counted the same way as deeper burns when calculating resuscitation needs. Accurate burn size estimation is therefore essential for correct use of the formula.

How TBSA Is Estimated

The total body surface area burned is a key part of the formula. In adults, the Rule of Nines is commonly used for rapid estimation. In children, body proportions differ, so a Lund and Browder chart is generally more accurate. Small burns may also be estimated using the patient’s palm as a rough guide to about 1% TBSA.

Accurate TBSA estimation matters because overestimation can lead to excessive fluid administration, while underestimation can lead to inadequate resuscitation.

How to Calculate the Parkland Formula

The calculation is straightforward:

Measure the patient’s weight in kilograms
Estimate the percentage of TBSA burned
Multiply weight × %TBSA × 4 mL
Give half in the first 8 hours from the time of injury
Give the other half over the next 16 hours

Example Calculation

A patient weighs 70 kg and has burns over 30% TBSA.

Parkland volume = 4 mL × 70 × 30

Parkland volume = 8400 mL

This means the estimated total fluid requirement for the first 24 hours is 8400 mL of Lactated Ringer’s solution.

The timing would be:

First 8 hours: 4200 mL
Next 16 hours: 4200 mL

If the patient arrives 2 hours after the burn occurred and no fluids have yet been given, the first 4200 mL should be delivered over the remaining 6 hours of the initial 8-hour window, not over a fresh 8-hour period.

What Fluid Is Usually Used

The classic Parkland Formula is based on Lactated Ringer’s solution. This is the standard crystalloid typically used for initial burn resuscitation because it is isotonic and more physiologically suitable than large-volume normal saline in many burn settings.

Normal saline in very large amounts can contribute to hyperchloremic acidosis, which is one reason Lactated Ringer’s is usually preferred for this purpose.

When the Parkland Formula Is Used

The formula is generally used for patients with significant burns who require formal intravenous resuscitation. In many settings, adults with burns greater than about 20% TBSA and children with burns greater than about 10% to 15% TBSA are more likely to require structured burn resuscitation, though local protocols vary.

It is most relevant during the initial 24 hours after injury, when capillary leak and fluid shifts are most pronounced.

Why the Formula Is Only a Starting Point

One of the most important principles in burn resuscitation is that the Parkland Formula is only an initial guide. It is not meant to be followed rigidly without regard to the patient’s response. Burn patients vary widely in age, inhalation injury, delay in presentation, associated trauma, alcohol use, comorbid illness, and physiologic reserve.

Some patients will need more fluid than the estimate, while others may need less. Over-resuscitation can cause serious problems such as extremity edema, abdominal compartment syndrome, pulmonary complications, and so-called fluid creep. Under-resuscitation can lead to shock and organ hypoperfusion.

How Resuscitation Is Monitored

After starting fluids, the patient must be reassessed frequently. One of the most commonly used bedside endpoints is urine output.

Typical targets are:

Adults: about 0.5 to 1 mL/kg/hour, often roughly 30 to 50 mL/hour
Children: about 1 mL/kg/hour

Other important indicators include heart rate, blood pressure, mental status, peripheral perfusion, lactate trend, base deficit, and overall clinical condition. The fluid rate is adjusted based on these responses rather than relying on the original formula alone.

How a Parkland Formula Calculator Helps

A calculator makes the early resuscitation estimate faster and more reliable. Instead of calculating manually during a time-sensitive emergency, the clinician can enter the patient’s weight and burn size and immediately obtain:

Total fluid needed in the first 24 hours
Amount for the first 8 hours
Amount for the next 16 hours
Approximate hourly rate for each phase

This improves workflow and reduces arithmetic errors, especially during initial trauma or emergency resuscitation.

Hourly Rate Interpretation

Although the Parkland Formula gives total volumes for 8-hour and 16-hour windows, many clinicians think in hourly infusion rates.

Using the earlier example of 8400 mL total:

4200 mL in the first 8 hours = 525 mL/hour
4200 mL in the next 16 hours = 262.5 mL/hour

If the patient arrives late, the hourly rate for the remaining time in the first phase must be increased accordingly. This is one of the most important practical uses of a burn calculator.

Special Considerations in Children

Children are not just small adults in burn resuscitation. They have different body proportions, different glycogen reserves, and different maintenance fluid needs. Although the classic Parkland approach is still widely referenced, pediatric burn care often requires additional attention to glucose needs, maintenance fluids, and more careful TBSA estimation using pediatric charts.

For that reason, a pediatric burn patient may need management beyond the simple classic Parkland estimate alone.

Common Errors When Using the Formula

Several mistakes can lead to problems when applying the Parkland Formula:

Starting the clock from hospital arrival instead of burn time
Overestimating TBSA
Including very superficial burns incorrectly
Failing to subtract fluids already given before arrival
Not adjusting fluids to urine output and clinical response
Using the formula as a rigid order rather than a starting estimate

These errors can lead to under-resuscitation or over-resuscitation, both of which are harmful.

Strengths of the Parkland Formula

The Parkland Formula remains popular because it has several practical strengths:

Simple to calculate
Widely taught and recognized
Useful in emergency settings
Provides a structured starting point
Easy to integrate into calculators and protocols

Its simplicity is one of the reasons it remains one of the most commonly referenced formulas in burn care.

Limitations of the Parkland Formula

Despite its usefulness, the Parkland Formula has important limitations.

It is only an initial estimate
It does not replace clinical judgment
It may overestimate or underestimate real needs in some patients
It does not account fully for inhalation injury, delayed presentation, obesity, or associated trauma
It may contribute to over-resuscitation if used without careful titration

This is why modern burn care emphasizes goal-directed adjustment rather than blind adherence to the calculated number.

Parkland Formula vs Modified Brooke Formula

The Parkland Formula is often compared with the Modified Brooke Formula. The main difference is that Parkland traditionally uses 4 mL/kg/%TBSA, while the Modified Brooke approach uses a lower crystalloid volume. This difference matters because concerns about fluid creep have led some centers to adopt more conservative starting strategies. Even so, Parkland remains the classic formula most people learn first.

Why Timing Matters So Much

The first several hours after a major burn are critical because fluid losses are greatest early on. If too little fluid is given during that period, organ perfusion may suffer. If too much is given, tissue edema can worsen dramatically. That is why the formula specifically divides the total volume into the first 8 hours and the following 16 hours, with the first half front-loaded early.

Knowing the exact time of injury is therefore essential when using the calculator correctly.

Clinical Use of the Result

Once the calculator provides the estimated fluid amount, the result is used to start resuscitation and establish a monitoring plan. In practice, clinicians usually:

Begin Lactated Ringer’s based on the calculated rate
Insert a urinary catheter in major burns when accurate output tracking is needed
Reassess frequently
Adjust the rate up or down based on urine output and perfusion
Watch carefully for both inadequate resuscitation and fluid overload

This shows why the formula is best thought of as a burn resuscitation entry point rather than a complete management algorithm.

Who Uses a Parkland Formula Calculator

A Parkland Formula calculator may be used by:

Emergency physicians
Burn surgeons and burn teams
Trauma clinicians
Critical care teams
Residents and medical trainees
Paramedics and prehospital providers in some systems

Its greatest value is in the early assessment phase when time matters and resuscitation decisions need to be made quickly.

Practical Tips for Accurate Use

Use body weight in kilograms
Estimate %TBSA as accurately as possible
Start counting from the time of burn injury, not hospital arrival
Subtract fluids already given before calculation of remaining needs
Use the formula as an initial guide only
Adjust to urine output and clinical endpoints

These practical steps make the calculator much more clinically useful and reduce the risk of common resuscitation errors.

Educational Value of the Parkland Formula

The Parkland Formula also has major educational value because it teaches a core principle of burn care: significant burns are not only skin injuries, they are major systemic injuries that can rapidly disrupt intravascular volume and organ perfusion. By linking weight, burn size, and time-based fluid replacement, the formula gives clinicians a structured framework for understanding why early resuscitation matters and how burn physiology drives treatment decisions.