Body Measurements • Instant Result

Body Surface Area Calculator

Calculate your total external Body Surface Area (BSA in m²) using the clinical Mosteller, DuBois, and Haycock formulas.

Enter Your Parameters

Gender

Age (Years)

Height (cm)

Weight (kg)

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Understanding Your Result

The calculation generated by this tool provides an evidence-based assessment derived from established physiological and clinical equations. Use this measurement as an educational indicator alongside broader lifestyle variables, including overall dietary quality, resistance training, cardiovascular endurance, and routine medical checkups.

Mathematical Formula & Scientific Methodology

The Mosteller formula is the modern clinical standard: BSA (m²) = √((Height in cm × Weight in kg) / 3600). The DuBois formula: BSA = 0.007184 × Height^0.725 × Weight^0.425.

\text{BSA (Mosteller)} = \sqrt{\frac{\text{Height (cm)} \times \text{Weight (kg)}}{3600}}

Step-by-Step Example Calculation

For a height of 175 cm and weight of 70 kg: BSA = √((175 × 70) / 3600) = √(12250 / 3600) = √3.4028 = 1.84 m².

Clinical Limitations & Nuances

BSA calculations are mathematical estimates. Direct clinical measurement is not practical in standard outpatient settings.

Frequently Asked Questions

Why is BSA used in medicine?

BSA provides a more accurate physiological indicator than body weight for calculating chemotherapy dosages, renal clearance (eGFR), and cardiac index.

What is the average adult body surface area?

The average BSA is approximately 1.9 m² for adult men and 1.6 m² for adult women.

Medically Reviewed Content