Body Surface Area Calculator

Calculate BSA — used in medicine for drug dosing and cardiac index — by two standard formulas.

About this calculator

BSA estimates the total surface of the body and correlates with metabolic rate better than weight alone, which is why chemotherapy and other drug doses are often prescribed per m². Mosteller is the simplest and most used formula.

Formula

Mosteller: BSA = √(cm × kg ÷ 3600) Du Bois: BSA = 0.007184 × kg^0.425 × cm^0.725

Results are estimates for information only — not medical advice. Sources: WHO, CDC, and peer-reviewed research.