What is body surface area?

Body surface area (BSA) is the total surface area of the human body. It is often used in medicine for dosing and clinical indices. The Mosteller formula is BSA = √((height × weight) / 3600) with height in cm and weight in kg.

Body Surface Area Calculator

Calculate BSA from height and weight using the Mosteller formula. UK metric.

Weight (kg)

Height (cm)

What is BSA?

Body surface area (BSA) is used in medicine for drug dosing and other clinical calculations. This calculator uses the Mosteller formula: BSA = √((height × weight) / 3600), with height in cm and weight in kg. The result is in square metres. For clinical use, always follow your clinician's guidance.

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