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Calculators / Health & fitness / Body surface area
Body surface area calculator
Estimate body surface area using the Mosteller formula.
On this page
Body surface area1.84m²
Calculator controls
How to calculate
Estimate body surface area using the Mosteller formula.
Body surface area = sqrt(height*weight/3600)
Worked example
Height (cm): 175; Weight (kg): 70.
Body surface area: 1.84 m².
Assumptions and limits
BSA is an estimate and must not be used to set medication doses without a qualified clinician and the applicable protocol.
Results are rounded for display; calculations use unrounded values. Read our calculation methodology.
Understanding the result
Estimate body surface area using the Mosteller formula. The displayed figures use the inputs and formula shown on this page.
When this tool is useful
Use the body surface area to compare a scenario, check an estimate, or verify a manual calculation.
Understanding your inputs
| Input | What to enter |
|---|---|
| Height (cm) | Enter a number of at least 0.000001 and no more than 1000000000000. |
| Weight (kg) | Enter a number of at least 0.000001 and no more than 1000000000000. |
Frequently asked questions
What should I check before using the body surface area result?
BSA is an estimate and must not be used to set medication doses without a qualified clinician and the applicable protocol.
Is this body surface area result exact?
It is exact for the stated mathematical model and entered values. Real-world results can differ when rates, timing, fees, definitions or measurement conditions differ.