Body Surface Area (BSA) Calculator

BSA – Quick Cheat Sheet

Mosteller (m²): sqrt((Height_cm × Weight_kg) / 3600) — widely used for dosing.
Du Bois (m²): 0.007184 × W^0.425 × H^0.725 (H in cm, W in kg) — classic historical formula.
Haycock (m²): 0.024265 × W^0.5378 × H^0.3964 — often cited for pediatrics.
Unit tips: in → cm = in × 2.54, lb → kg = lb × 0.45359237.
Precision: Values are shown to 3 decimals; dosing protocols may specify their own rounding.
Scope: This calculator estimates BSA only. It does not make dosing recommendations.

Notes & assumptions

Inputs outside typical human ranges prompt a check to reduce entry errors.
All formulas expect height in centimeters and weight in kilograms; inputs are normalized internally.
Differences among formulas are usually small for average adults; they may diverge at extremes or in pediatrics.