Last updated: April 2026
Unit system
1.94 m^2
Formula: Mosteller
Body surface area is an estimate. It should not be used for medical decisions without professional guidance.
Body Surface Area estimates total external body surface area from height and weight.
The Mosteller formula is BSA = sqrt((height in cm x weight in kg) / 3600).
Different BSA formulas use different exponents and constants, so they may produce slightly different results.
BSA is an estimate and should not be used for medical decisions without professional guidance.
This calculator is designed to help you understand the likely number before you make a decision or start an application.
Your result should be checked against official UK guidance, especially if your circumstances include dependants, exemptions, prior leave, or a complex immigration history.
Treat the figure as a planning tool rather than legal advice. Where the answer affects an application deadline or major payment, speak to an authorised adviser.
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