Quick guide
How to use this calculator
- Use the labels and unit notes to enter the requested measurement, date, time, or observation exactly as recorded.
- Check the visible method, population, and unit basis before using the result; switch modes rather than converting values mentally.
- Read the calculation audit and limitations together. The result supports measurement or tracking and does not replace diagnosis, treatment, or urgent medical assessment.
Calculation method
How the body surface area calculator works
Mosteller BSA in m² = square root of [height in cm multiplied by weight in kg divided by 3600].
Body surface area is an equation-based size estimate. Some professional protocols use BSA, but the applicable measurement, rounding, and dosing rules come from that protocol, not this calculator.
Worked example
Body Surface Area example
At 170 cm and 70 kg, the Mosteller estimate is approximately 1.82 m².
Mosteller BSA in m² = square root of [height in cm multiplied by weight in kg divided by 3600].
Supported inputs
Precision and limits
Supported purpose
This page performs the Mosteller arithmetic only. It must not be used to choose, verify, or alter a medication, chemotherapy, contrast, or radiation dose.
Measurement quality
The output is only as reliable as the entered measurement, device, timing, units, and applicable reference population. Recheck unexpected values against the original record.
Clinical boundary
This calculator does not diagnose a condition, choose treatment, change medication, or determine that an urgent symptom is safe to monitor at home. Contact an appropriate health professional or local emergency service when the situation may be urgent.
Privacy
Entered health values and results stay in this browser tab. They are not placed in URLs, analytics, logs, local storage, session replay, or a cloud record by this calculator.
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