Body Surface Area Calculator – Calculate BSA | Health Tool

Body Surface Area Calculator

Calculate your Body Surface Area (BSA) using multiple scientific formulas. BSA is used in medical practice for medication dosing, physiological measurements, and clinical assessments.

1 Your Measurements

Units

Metric (cm, kg)

Imperial (in, lb)

Height

Weight

Average Body Surface Area

1.82 m²

Most Common Formula Result

1.82 m²

(Mosteller formula)

BSA Formulas & Results

Formula	BSA (m²)	Year	Common Uses
Mosteller	1.82	1987	General medical use
DuBois & DuBois	1.80	1916	Historical reference
Haycock	1.83	1978	Pediatrics
Gehan & George	1.81	1970	Oncology research
Boyd	1.84	1935	Metabolic studies

📐 Mosteller Formula

BSA = √(Height × Weight / 3600)

Simplest and most commonly used formula today. Provides a good balance of accuracy and simplicity.

📏 DuBois & DuBois

BSA = 0.007184 × Height^0.725 × Weight^0.425

The original BSA formula developed in 1916. Still referenced but less commonly used than Mosteller.

👶 Haycock Formula

BSA = 0.024265 × Height^0.3964 × Weight^0.5378

Developed specifically for pediatric patients. Often used for children and infants.

🔬 Gehan & George

BSA = 0.0235 × Height^0.42246 × Weight^0.51456

Used primarily in oncology research and chemotherapy dosing calculations.

⚖️ Boyd Formula

BSA = 0.0003207 × Height^0.3 × Weight^{(0.7285 – (0.0188 × log(Weight)))}

Developed for metabolic studies and considered one of the most accurate formulas.

About Body Surface Area

📏 What is BSA?

Body Surface Area (BSA) is the total surface area of the human body. It’s a more accurate measurement than body weight for determining metabolic rate and is widely used in medical practice.

BSA is particularly important for calculating medication dosages for chemotherapy, antibiotics, and other drugs where precise dosing is critical.

💊 Medical Applications

Medication Dosing: Many drugs, especially chemotherapeutic agents, are dosed based on BSA to maximize effectiveness while minimizing toxicity.

Physiological Measurements: Cardiac index and other physiological measurements are often indexed to BSA.

Burn Assessment: The extent of burns is expressed as a percentage of total BSA.

📊 Normal BSA Values

The average BSA for adults is:

• Men: 1.9 m²
• Women: 1.6 m²

BSA varies significantly with age, height, and weight. Newborns have an average BSA of 0.25 m², which increases throughout childhood.

⚕️ Clinical Importance

BSA measurement is crucial for:

• Chemotherapy dosing
• Glomerular filtration rate (GFR) calculations
• Cardiac index determination
• Nutritional assessment
• Burn management

Medical Note: Body Surface Area calculations are estimates. Different formulas may be preferred in specific medical contexts. Always consult with a healthcare professional for medical dosing decisions. The average adult BSA is 1.7 m² (men) and 1.6 m² (women).