Body Surface Area Calculator
Calculate Body Surface Area (BSA) using 7 major medical formulas. Essential for accurate medication dosing, chemotherapy calculations, and clinical assessments.
Patient Information
Enter patient details to calculate Body Surface Area using multiple formulas
BSA Formulas: This calculator uses 7 major formulas including Du Bois, Mosteller, Haycock, Gehan & George, Boyd, Fujimoto, and Takahira methods for comprehensive comparison.
BSA Results
Enter patient information and click Calculate to see BSA results.
Understanding Body Surface Area
What is BSA?
Body Surface Area (BSA) is a measurement of the total surface area of the human body. It's crucial for determining appropriate medication dosages, especially in chemotherapy, and for various physiological calculations.
Clinical Applications
- Chemotherapy dosing
- Cardiac index calculations
- Burn assessment
- Renal clearance studies
- Metabolic rate calculations
Formula Comparison
Most Common: Du Bois Formula
BSA = 0.007184 × W^0.425 × H^0.725
Simplified: Mosteller Formula
BSA = √(W × H / 3600)
Note: Normal adult BSA ranges from 1.5 to 2.0 m². Average adult BSA is approximately 1.7 m².
How to Use This Calculator
Step-by-step guide to get accurate results
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Body Surface Area (BSA) Calculator Online – Accurate, Free, and Easy to Use
Understanding your body surface area (BSA) is essential in medicine, research, and clinical care. This free BSA calculator helps you quickly and accurately estimate your BSA for adults, children, and special clinical scenarios. Whether you're a healthcare professional, medical student, or patient, this tool provides a smart, user-friendly solution for calculating BSA online.
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What is Body Surface Area (BSA) and Why is It Important?
BSA is the total surface area of the human body, usually expressed in square meters (m²). It plays a critical role in medicine because it:
Drug Dosages
Helps calculate drug dosages, especially chemotherapy and critical care medications.
Fluid Replacement
Guides fluid replacement therapy in ICU patients.
Kidney Assessments
Supports kidney function assessments and other diagnostic tests.
Personalized Care
Provides personalized measurements for pediatric and adult care.
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How to Calculate Body Surface Area (BSA) Accurately
This BSA calculator online uses widely accepted formulas based on weight, height, and sometimes gender. Popular formulas include:
Du Bois BSA Formula
BSA (m²) = 0.007184 × Weight^0.425 × Height^0.725 — Used for adults & children, clinical standard.
Mosteller Formula
BSA (m²) = √(Height × Weight / 3600) — Simple, commonly used in hospitals.
Haycock Formula
BSA (m²) = 0.024265 × Weight^0.5378 × Height^0.3964 — Pediatric medicine.
Gehan & George
BSA (m²) = 0.0235 × Weight^0.51456 × Height^0.42246 — Research & clinical studies.
Inputs
Weight (kg), Height (cm), Gender (optional: pediatric adjustments).
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Clinical Applications of BSA
The BSA measurement is not just a number—it has real-world medical applications:
Chemotherapy dosing
Personalized drug doses reduce toxicity while maintaining efficacy.
ICU patients
Guides fluid therapy and critical care monitoring.
Pediatric medicine
Adjusts medication and nutrition for children accurately.
Kidney function tests
Helps calculate renal clearance and dialysis parameters.
Medical research
Supports epidemiological studies, drug trials, and clinical audits.
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Limitations & Disclaimer
While this BSA calculator for adults and children is medically accurate, remember:
Estimates only
Results are estimates and should not replace medical advice.
Professional guidance
Always consult a healthcare professional before adjusting treatment.
Other factors
Body composition, hydration, and age may affect accuracy.
Frequently Asked Questions
What is BSA and why is it important?
BSA represents your body's total surface area. It's crucial for drug dosing, ICU care, and medical testing, as it provides a more precise measure than BMI for clinical purposes.
How do I calculate BSA accurately?
Enter your weight, height, and optionally gender into the calculator. Formulas like Du Bois, Mosteller, or Haycock are commonly used for accurate results.
Which BSA formula is the most reliable?
The Du Bois formula is widely accepted for adults and children, but Mosteller is simpler and commonly used in hospitals.
How does BSA affect chemotherapy dosing?
Chemotherapy drugs are dosed based on BSA to ensure treatment is effective while minimizing toxicity.
Can children and adults use the same BSA calculator?
Yes, but pediatric formulas like Haycock provide more accurate results for children due to different body proportions.
How does weight and height influence BSA?
BSA increases with both weight and height, reflecting the total body surface area more accurately than BMI.
Is the BSA calculator accurate for ICU patients?
Yes, it is clinically validated, but adjustments may be required for critically ill patients with fluid imbalances.
Can I use this tool for medical research?
Absolutely. The personalized BSA calculator online supports research and clinical studies by providing standardized measurements.
How is AI used in BSA calculations?
AI can enhance accuracy, generate reports, and recommend clinical adjustments based on patient data trends.
Can this calculator be used in hospitals for clinical purposes?
Yes, the medical BSA calculator and AI-powered BSA tools are suitable for hospital, ICU, and pediatric settings.