Body Surface Area Calculator

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Body Surface Area Calculator – Calculate BSA for Medical Dosing

The Body Surface Area (BSA) Calculator is a medical tool used to calculate the total surface area of a human body. BSA is an important measurement in medicine, particularly for calculating drug dosages, chemotherapy doses, and determining cardiac output. This calculator supports multiple clinically validated formulas including Mosteller, Du Bois, and Haycock equations.

What is Body Surface Area (BSA)?

Body Surface Area represents the total surface area of the human body measured in square meters (m²). Unlike BMI, which is a ratio, BSA is an absolute measurement that takes into account both height and weight to provide a more accurate representation of body size. The average BSA for adults typically ranges from 1.6 to 1.9 m².

BSA Formulas

This calculator supports three commonly used BSA formulas:

  • Mosteller Formula: BSA = √((height × weight) / 3600) - The most commonly used formula, simple and accurate.
  • Du Bois Formula: BSA = 0.007184 × height^0.725 × weight^0.425 - One of the original formulas, widely used in clinical practice.
  • Haycock Formula: BSA = 0.024265 × height^0.3964 × weight^0.5378 - Often preferred for pediatric and adult populations.

Medical Applications of BSA

BSA is crucial in various medical applications:

  • Chemotherapy Dosing: Many chemotherapy drugs are dosed based on BSA to ensure appropriate drug exposure while minimizing toxicity.
  • Drug Dosage Calculation: Some medications require BSA-based dosing for optimal therapeutic effects.
  • Cardiac Output: BSA is used to normalize cardiac output measurements (cardiac index).
  • Renal Function: Used in calculating glomerular filtration rate (GFR) in some formulas.
  • Fluid Resuscitation: Helps determine appropriate fluid volumes in certain clinical scenarios.

Important Notes

While BSA calculators provide useful estimates, they should always be used in conjunction with clinical judgment. Different formulas may yield slightly different results, and healthcare professionals may prefer specific formulas based on patient population and clinical context. Always consult with qualified healthcare providers for medical dosing decisions.