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Body Surface Area (BSA) Calculator

Mosteller (Standard) Du Bois Haycock

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Understanding Body Surface Area (BSA)

Body Surface Area (BSA) is the total surface area of a human body. In clinical medicine, BSA is often considered a more accurate indicator of metabolic mass than body weight alone because it is less affected by abnormal body fat proportions. It is primarily used to calculate precise dosages for chemotherapy, corticosteroids, and other medications with narrow therapeutic indexes.

Common Formulas Used

There are several mathematical models used to estimate BSA. Our calculator provides the three most statistically significant methods:

• Mosteller Formula: The most commonly used formula due to its simplicity. Calculation: √([Height(cm) x Weight(kg)] / 3600).
• Du Bois Formula: One of the oldest and most widely cited formulas in medical literature. Calculation: 0.007184 x W^0.425 x H^0.725.
• Haycock Formula: Often preferred for pediatric patients (infants and children). Calculation: 0.024265 x W^0.5378 x H^0.3964.

BSA Example Calculation

For an adult male who weighs 80 kg and stands 180 cm tall:

1. Using the Mosteller formula: Multiply 80 by 180 (14,400).
2. Divide 14,400 by 3,600 (Result: 4).
3. Take the square root of 4.
4. The BSA is 2.00 m².

Why is BSA Important?

Medical professionals use BSA for several critical calculations, including:

• Chemotherapy: Most oncology drugs are dosed per square meter (mg/m²) to minimize toxicity.
• Cardiac Index: Relates the cardiac output from the left ventricle in one minute to the body surface area.
• Glomerular Filtration Rate (GFR): Standardized to BSA to assess kidney function accurately.

Disclaimer: This calculator is for educational purposes only. Always consult with a medical professional for drug dosing and clinical decisions.