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Learn more →Body Surface Area Calculator (BSA)
Calculate your body surface area (BSA) in square meters from your height and weight using the Mosteller formula. BSA is widely used in medicine to help estimate drug dosages and assess metabolic needs.
Enter your height and weight to estimate your body surface area.
How it works
What is body surface area (BSA)?
Body surface area (BSA) is the measured or estimated total surface of the human body, expressed in square meters (m²). It often reflects metabolic processes more accurately than body weight alone.
In clinical practice, BSA is used to calculate drug doses, especially for chemotherapy, and to standardize measurements such as cardiac index.
The Mosteller formula
This calculator uses the Mosteller formula: BSA (m²) = √(height_cm × weight_kg / 3600). It is simple, widely accepted, and easy to compute.
Results are an estimate only and are not medical advice. Always consult a qualified healthcare professional for dosing or treatment decisions.
Frequently asked questions
›What is a normal BSA value?
For an average adult, BSA is typically around 1.7 m². Values vary with height and weight.
›Which formula does this tool use?
It uses the Mosteller formula: BSA (m²) = √(height_cm × weight_kg / 3600).
›Why is BSA used for medication?
Many drugs, especially chemotherapy agents, are dosed per square meter of BSA to better match the body's metabolism.
›Is this calculator accurate?
The Mosteller formula gives a reliable estimate, but it is an approximation and should not replace professional medical assessment.
›Can I use it for children?
The Mosteller formula works across ages, but pediatric dosing should always be confirmed by a clinician.
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