Body Surface Area (BSA) Calculator

Calculate body surface area for chemotherapy dosing and hemodynamic indices using Mosteller or DuBois formula.

Height (cm) (cm)

Weight (kg) (kg)

Formula

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Worked Examples

Example 1: Average adult: 175cm, 70kg

Mosteller: √(175×70/3600)

Result: 1.84 m²

Close to reference standard 1.73 m²

Example 2: Pediatric: 100cm, 16kg

Mosteller: √(100×16/3600)

Result: 0.667 m²

Essential for pediatric chemotherapy dosing

Frequently Asked Questions

Why is BSA used for chemotherapy?

Many chemotherapy drugs have narrow therapeutic windows. BSA normalizes dosing for body size, reducing toxicity in small patients and under-dosing in large ones. Standard dose: mg/m².

Mosteller vs DuBois?

Mosteller is simpler and widely used in oncology. DuBois is the original formula (1916). Both agree within 5% for average adults. Mosteller is recommended by most oncology guidelines.