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Body Surface Area (BSA) Calculator

Calculate body surface area using the Mosteller formula.

Last updated: 13 Aug 2026

Quick answer

The Mosteller formula for body surface area is BSA = √(height cm × weight kg ÷ 3600). For example, 170 cm and 70 kg gives about 1.82 m². Enter your height and weight above.

Body Surface Area (BSA) is used in medicine for dosing and clinical calculations. The Mosteller formula: BSA = √(height × weight ÷ 3600), for height in cm and weight in kg.

How to calculate body surface area

  1. 1 Enter your height in cm and weight in kg.
  2. 2 We apply the Mosteller formula.
  3. 3 Your BSA in square metres appears instantly.

Frequently asked questions

What is body surface area used for?
BSA is used clinically for drug dosing (e.g. chemotherapy) and to index physiological measures.
What is the Mosteller formula?
BSA (m²) = square root of (height in cm × weight in kg ÷ 3600).
Is this medical advice?
No — it is an informational calculator; clinical decisions should be made by a healthcare professional.

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