Body Surface Area Calculator — Standard Formulas
Calculate body surface area with multiple medical formulas
How to Use Body Surface Area Calculator
Calculate body surface area with multiple medical formulas No signup, and nothing gets uploaded for most use.
- 1
Enter your numbers in the input fields.
- 2
Choose the calculation options or frequency.
- 3
The result updates instantly as you type.
- 4
Review the breakdown, chart, or schedule, and copy the answer.
Why you might like it
- Nothing to upload — the work happens on your device.
- Free with no signup, no watermarks, and no daily limits.
- Works in any modern browser on any device — nothing to install.
- Usually done in a few seconds, so it doesn't get in your way.
Frequently Asked Questions
What is body surface area used for?▾
BSA is used in medicine to calculate chemotherapy dosages, fluid replacement and cardiac output, because many physiological processes scale with surface area rather than weight alone.
Which BSA formula is most accurate?▾
The Mosteller formula is simple and accurate for most adults and is the most widely used. The Gehan-George formula is slightly more precise across a wide range of body sizes.
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