Body Surface Area Calculator
Calculate body surface area (BSA) using multiple validated formulas — essential for drug dosing and clinical assessments.
Medical Significance
Chemotherapy agents and other drugs are commonly dosed by body surface area (mg/m²) to prevent under- or overdosing across patients of different sizes.
BSA is the foundation of burn severity assessment (Rule of Nines) and fluid resuscitation calculations in burn patients.
Glomerular filtration rate (GFR) is normalized to a standard BSA of 1.73 m² to allow comparison across patients of different body sizes.
Formula Reference
Oldest and most widely used formula. Standard in chemotherapy dosing.
Simplest calculation, very accurate approximation. Recommended by the New England Journal of Medicine.
Optimized for children and adults. Considered highly accurate.
Accounts for non-linear relationship between weight and BSA. Less commonly used.