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Body Surface Area (BSA) Calculator

Calculate body surface area using the Mosteller formula

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Educational Use Only: This tool is for educational purposes only. It does not replace clinical judgment or medical advice.

Weight(kg)

Height(cm)

Formula Selection

Mosteller (Recommended)

Most commonly used, simple and accurate

DuBois & DuBois

Historical formula, complex calculation

Haycock

Alternative formula for research

BSA (m²) = √((Height × Weight) ÷ 3600)

Average Adult BSA: 1.7 m² (range 1.5-2.0 m²)

• Chemotherapy dosing: Most cancer drugs dosed per m²

• Cardiac index: CO/BSA for normalized cardiac output

• Burn assessment: Percentage of BSA burned

• Renal function: GFR normalized to 1.73 m²

• Medication dosing: Pediatric and high-risk drugs

Mosteller: Simplest and most widely used. Recommended by most medical organizations for clinical use.

DuBois: First published BSA formula (1916). More complex but historically significant.

Haycock: Alternative formula that may be more accurate for very obese patients.

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