Body Surface Area Calculator
Estimate body surface area using the Mosteller formula.
This page is an editable estimator with realistic defaults so you can model your own situation in minutes.
Mosteller BSA = square root of height in centimeters x weight in kilograms divided by 3600.
Treat the result as a planning estimate and verify important numbers with the relevant official source before acting.
| Formula | Mosteller |
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Assumptions
- BSA is a clinical estimate and should be confirmed in medical settings.
- Do not use this for medication dosing decisions without a clinician.
How this calculator works
Formula used
Mosteller BSA = square root of height in centimeters x weight in kilograms divided by 3600.
Example calculation
Plug in your own numbers and the result updates instantly. Mosteller BSA = square root of height in centimeters x weight in kilograms divided by 3600.
Body Surface Area Calculator FAQ
Is this body surface area calculator medical advice?
No. It is an educational estimate only and should not be used to diagnose, treat, or make medical, nutrition, legal, or emergency decisions.
Why might my real result be different?
Age, sex, body composition, pregnancy, medications, medical conditions, training status, lab methods, and measurement accuracy can all change real-world results.
Should I check these results with a professional?
Yes. Confirm health, nutrition, fitness, kidney function, alcohol, or safety decisions with a qualified professional or official source.