Body Surface Area Calculator

Body Surface Area (BSA) estimates the total external area of the human body, and this tool computes it two ways, through the DuBois and the Mosteller formulas. Clinicians lean on BSA because it often tracks metabolic rate more closely than weight does, which makes it central to dosing decisions in chemotherapy and pediatric care. Through 2026, that reliance holds: accurate BSA figures help tailor treatment to the individual, pushing for effective doses while holding down the risk of adverse drug reactions.

Two equations drive the result. The DuBois formula reads BSA = 0.007184 × Height(cm)^0.725 × Weight(kg)^0.425, while Mosteller takes the form BSA = √((Height(cm) × Weight(kg))/3600). Each approximates whole-body surface area and the two tend to land close to one another, with small differences. Both were fitted from extensive measurement studies and have earned standing in clinical practice for their dependability and the speed with which they can be applied.

For the numbers to come out right, enter height in centimeters and weight in kilograms. BSA is an approximation, and real physiology varies from person to person, so treat any figure here as a reference point. This tool serves information only; it does not replace a clinician, and any actual dosing or medical decision belongs in the hands of a qualified healthcare professional.