Parkland Formula Calculator
Calculate IV fluid resuscitation volume for burn patients using the Parkland/Baxter formula. Enter values for instant results with step-by-step formulas.
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Second 24 Hours (Day 2)
Formula
The Parkland formula calculates the total crystalloid (lactated Ringer's solution) volume needed in the first 24 hours. Half is given in the first 8 hours from time of burn, and half over the next 16 hours. The formula applies to second and third-degree burns exceeding 20% TBSA in adults.
Last reviewed: January 2026
Worked Examples
Example 1: Adult 30% TBSA Burn
Example 2: Delayed Resuscitation (2 Hours Post-Burn)
Background & Theory
The Parkland Formula Calculator applies the following established principles and formulas. Health and medicine calculators are grounded in validated physiological measurement methods established through decades of clinical research. Body Mass Index, or BMI, is calculated by dividing weight in kilograms by height in meters squared (kg/m²), a formula originating from Adolphe Quetelet's 19th-century statistical work and later codified by the WHO into standard classifications: underweight below 18.5, normal weight 18.5 to 24.9, overweight 25 to 29.9, and obese at 30 and above. Basal Metabolic Rate quantifies the minimum energy required to sustain life at rest. The Mifflin-St Jeor equation, published in 1990 and widely regarded as the most accurate for most adults, calculates BMR as (10 × weight in kg) + (6.25 × height in cm) − (5 × age) ± sex adjustment. The older Harris-Benedict equations, revised in 1984 by Roza and Shizgal, remain in common use. Total Daily Energy Expenditure is derived by multiplying BMR by a physical activity factor ranging from 1.2 for sedentary individuals to 1.9 for extremely active ones, following the methodology validated by doubly labeled water studies. Body fat percentage can be estimated without laboratory equipment using the U.S. Navy circumference method, which uses neck, waist, and hip measurements, or via BMI-derived equations adjusted for age and sex. The Jackson-Pollock skinfold method offers higher precision with calipers. Blood pressure classification, according to the American College of Cardiology and the 2017 ACC/AHA guidelines, defines normal as below 120/80 mmHg, elevated as 120 to 129 systolic, and hypertension stage 1 as 130 to 139 systolic or 80 to 89 diastolic. Target heart rate zones for aerobic exercise are derived from maximum heart rate estimates, most commonly using the formula 220 minus age in years, with moderate-intensity training typically defined as 50 to 70 percent of maximum heart rate and vigorous intensity at 70 to 85 percent, consistent with CDC and American Heart Association guidelines. These thresholds guide safe and effective cardiovascular conditioning.
History
The history behind the Parkland Formula Calculator traces back through the following developments. The history of health measurement stretches back to ancient Greece, where Hippocrates around 400 BCE laid the foundation for observational medicine by systematically recording patient symptoms, diet, and environment. His humoral theory, though scientifically superseded, established the principle that the body operates as an interconnected system subject to measurable imbalance. The transformation toward modern medicine accelerated in the 19th century. Louis Pasteur and Robert Koch developed germ theory in the 1860s and 1870s, identifying microorganisms as disease agents and enabling targeted interventions. Florence Nightingale, working during the Crimean War in the 1850s, introduced statistical analysis to nursing practice, demonstrating through data visualization that sanitation reduced mortality. Her work is foundational to evidence-based health measurement. The discovery of vitamins in the early 20th century, beginning with Casimir Funk's coinage of the term in 1912 and culminating in the isolation of vitamins A through K, created the field of nutritional science and gave rise to dietary reference intake frameworks. The World Health Organization, founded in 1948, subsequently established global standards for health metrics, disease classification through the International Classification of Diseases, and recommended daily allowances. The BMI as a clinical screening tool gained traction in the 1970s through Ancel Keys' large-scale epidemiological work, which validated Quetelet's index as a population-level obesity indicator. Through the 1980s and 1990s, the Framingham Heart Study produced landmark data linking cholesterol, blood pressure, and lifestyle factors to cardiovascular disease risk, directly shaping the numeric thresholds still used in health calculators. The evidence-based medicine movement, formalized by Gordon Guyatt and colleagues at McMaster University in the early 1990s, demanded that all health recommendations derive from systematically graded clinical evidence. The digital health era beginning in the 2000s brought these formulas to consumer devices, wearable sensors, and smartphone applications, expanding access to health self-monitoring on a global scale and enabling population-level data collection that continues to refine clinical reference ranges.
Frequently Asked Questions
Formula
Total Fluid (mL) = 4 x Weight (kg) x %TBSA
The Parkland formula calculates the total crystalloid (lactated Ringer's solution) volume needed in the first 24 hours. Half is given in the first 8 hours from time of burn, and half over the next 16 hours. The formula applies to second and third-degree burns exceeding 20% TBSA in adults.
Worked Examples
Example 1: Adult 30% TBSA Burn
Problem: A 70 kg adult sustains 30% TBSA second and third-degree burns. Calculate the Parkland fluid resuscitation protocol.
Solution: Parkland Formula: 4 mL x 70 kg x 30% = 8,400 mL total in 24 hours\nFirst 8 hours: 8,400 / 2 = 4,200 mL at 525 mL/hr\nNext 16 hours: 8,400 / 2 = 4,200 mL at 262.5 mL/hr\nFluid type: Lactated Ringer's solution\nUrine output target: 0.5 x 70 = 35 mL/hr minimum\nClassification: Major burn
Result: Total: 8,400 mL | First 8hr: 525 mL/hr | Next 16hr: 263 mL/hr | Urine target: 35 mL/hr
Example 2: Delayed Resuscitation (2 Hours Post-Burn)
Problem: A 80 kg patient with 40% TBSA burns arrives at the ER 2 hours after the burn. Calculate adjusted fluid rates.
Solution: Total 24hr: 4 x 80 x 40 = 12,800 mL\nFirst 8hr volume: 6,400 mL\nTime elapsed: 2 hours, remaining: 6 hours\nAdjusted rate for first period: 6,400 / 6 = 1,067 mL/hr\n(versus standard rate of 6,400 / 8 = 800 mL/hr)\nNext 16hr: 6,400 mL at 400 mL/hr\nUrine target: 0.5 x 80 = 40 mL/hr
Result: Adjusted first 8hr rate: 1,067 mL/hr (6hr remaining) | Next 16hr: 400 mL/hr
Frequently Asked Questions
What is the Parkland formula and when is it used?
The Parkland formula (also known as the Baxter formula) is the most widely used guideline for calculating initial IV fluid resuscitation volumes for burn patients. Developed by Dr. Charles Baxter at Parkland Memorial Hospital in Dallas, Texas, the formula calculates the total crystalloid volume needed in the first 24 hours after a burn injury as 4 mL multiplied by the patient's body weight in kilograms multiplied by the percentage of total body surface area (TBSA) burned. Half of this volume is administered in the first 8 hours from the time of burn (not from the time of hospital arrival), and the remaining half over the next 16 hours. The formula uses lactated Ringer's solution as the fluid of choice because its composition closely resembles plasma. It is typically applied to burns greater than 20% TBSA in adults and greater than 10% TBSA in children.
What are the key differences between the Parkland and modified Brooke formulas?
The Parkland formula uses 4 mL/kg/%TBSA of crystalloid (lactated Ringer's solution) with no colloid in the first 24 hours, while the modified Brooke formula uses 2 mL/kg/%TBSA of crystalloid, essentially half the Parkland volume. Both formulas distribute the calculated volume with half given in the first 8 hours and the remainder over the next 16 hours. The modified Brooke formula was developed in response to concerns about fluid overload complications (abdominal compartment syndrome, pulmonary edema) seen with the larger Parkland volumes. In practice, most burn centers start with the Parkland formula as an initial estimate and then titrate the rate based on urine output and clinical response. Recent evidence suggests that actual fluid requirements often exceed Parkland predictions, a phenomenon termed fluid creep, making clinical monitoring more important than strict formula adherence.
How do I interpret the result?
Results are displayed with a label and unit to help you understand the output. Many calculators include a short explanation or classification below the result (for example, a BMI category or risk level). Refer to the worked examples section on this page for real-world context.
How do I get the most accurate result?
Enter values as precisely as possible using the correct units for each field. Check that you have selected the right unit (e.g. kilograms vs pounds, meters vs feet) before calculating. Rounding inputs early can reduce output precision.
What inputs do I need to use Parkland Formula Calculator accurately?
Each field is labelled with the required unit (metric or imperial). Gather your source values before starting — for example, a weight measurement in kilograms, a distance in metres, or a dollar amount — and enter them exactly as measured. The formula section on this page lists every variable and explains what each represents.
Can I use the results for professional or academic purposes?
You may use the results for reference and educational purposes. For professional reports, academic papers, or critical decisions, we recommend verifying outputs against peer-reviewed sources or consulting a qualified expert in the relevant field.
References
Reviewed by Rahul Singh, Health & Wellness Specialist · Editorial policy