Body surface area (BSA) calculator
Calculate body surface area from weight and height with the Mosteller formula.
Your result appears here as you type.
The Mosteller formula
BSA (m²) = √(height in cm × weight in kg ÷ 3600). For 175 cm and 70 kg, that is √(175 × 70 ÷ 3600) = 1.84 m². Adults average around 1.7 m².
Where BSA is used
Clinicians use BSA to index measurements, such as cardiac output, to body size. Check any treatment calculation against your local protocol.
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What is a normal BSA?
There is no normal value as such, because it depends on body size. Around 1.7 m² is a commonly quoted adult average.
Why use the Mosteller formula?
It is simple, widely used, and gives results close to the older, more complex formulas.
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