Body Surface Area Calculator

📐 Body Surface Area (BSA) Calculator

📘 What is Body Surface Area (BSA)?

Body Surface Area (BSA) is a measure of the total surface area of the human body. It’s an important medical parameter often used in clinical settings to determine drug dosages, especially in chemotherapy, and to assess cardiac output, renal function, and metabolic rates.

🧮 BSA Formula (DuBois & DuBois)

The most widely used and accurate formula to calculate BSA is the DuBois & DuBois formula:

BSA (m²) = 0.007184 × Height^0.725 × Weight^0.425
where Height is in cm and Weight is in kg.

📊 Common BSA Ranges

• Newborn: ~0.25 m²
• Child (10 yrs): ~1.14 m²
• Adult Woman: ~1.6 m²
• Adult Man: ~1.9 m²

💊 Clinical Use of BSA

• Calculating chemotherapy dosages
• Adjusting medication levels
• Measuring metabolic function
• Assessing burn injury percentages
• Evaluating cardiac output and organ functions

🏥 Why is BSA Better Than BMI for Some Use Cases?

Unlike BMI, which is only based on weight and height and is more useful for categorizing obesity, BSA takes into account the body surface exposed to the environment. BSA is more accurate for medication dosing and metabolic rate estimation.

📏 Other BSA Formulas

While the DuBois formula is most used, others include:

• Mosteller: √[(Height(cm) × Weight(kg)) / 3600]
• Haycock: 0.024265 × Height^0.3964 × Weight^0.5378
• Gehan and George: 0.0235 × Height^0.42246 × Weight^0.51456

🎯 Tips for Accurate BSA Estimation

• Use accurate weight and height data
• Choose consistent units (cm and kg)
• Use BSA alongside other health metrics like BMI, LBM, and body fat %

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⚠️ Disclaimer:

This tool is intended for informational purposes only. Always consult a medical professional for accurate health assessments and medication decisions. The BSA value should be interpreted within clinical context.

Use this free BSA calculator to determine your body surface area quickly and accurately using height and weight values.